New Build Building Regulations Drawings in Sutton

Building regulations drawings are the technical drawings and calculations prepared to satisfy Building Control that a building will be safe, healthy, warm, structurally sound and compliant with the law before it is built and as it is built. They are a completely separate exercise from the planning drawings. Planning is about whether a home is acceptable in its location — its appearance, its scale, its impact on neighbours and the character of the street. Building Regulations are about whether the home is properly built — whether it will stand up, keep the weather out, resist fire, be adequately ventilated and drained, meet its energy targets, protect its occupants and be reasonably accessible. The two consents are granted by different processes, judged against different rules, and a new home needs both.

On a new-build dwelling this technical package is unusually demanding, because a new home has to satisfy every relevant Part of the Building Regulations from scratch. An extension can lean on the existing house — it inherits the drainage, the heating, much of the structure and the fire strategy of the building it joins. A new dwelling inherits nothing. It needs a designed foundation, a complete load-bearing structure, a full fire strategy, a whole drainage system, a complete set of building services and an energy strategy that meets the current national target — every one of them designed, drawn and, where the Regulations require it, calculated. That is why a new-build building regulations package is a serious body of work, and why it is best produced by the same team that designed the home.

The package itself is a coordinated set of drawings supported by calculations and specifications. The drawings develop the approved planning design by adding the technical substance the planning stage deliberately left open: construction build-ups for the walls, floors and roof with their insulation and U-values; the structural design of the foundations and frame; the fire strategy with escape routes and fire-resisting construction; the ventilation strategy; the sound-insulation design; the drainage layout; and the electrical, water and services layouts. Alongside the drawings sit the structural calculations, the SAP energy calculation, and written specifications that pin down materials and standards of workmanship. Together they are what Building Control approves and what the site inspections then check against.

It is worth being precise about the relationship between the three drawing stages, because it is where new builds most often go wrong. Planning drawings answer 'what and where'; building regulations drawings answer 'is it compliant and safe'; and construction drawings answer 'exactly how is it built, junction by junction'. The building regulations package is the crucial middle stage: it turns an approved appearance into a proven, calculated building, and it feeds directly into the construction package the builder works from. Skip or skimp it, and you have a planning permission that cannot lawfully or safely be built. Crown prepares the building regulations package as a proper, coordinated stage, with the structure, energy and services designed in-house, so it is genuinely buildable rather than a set of drawings that falls apart when Building Control or a builder examines it.

The people we prepare new-build building regulations drawings for in Sutton fall into a few clear groups, and they arrive at this stage from slightly different starting points. The first is the individual homeowner or family building their own home — usually on a plot they own, in a large garden, or on a replacement-dwelling basis where a tired bungalow or dated house is demolished and a modern, energy-efficient family home built in its place. Very often they already have planning permission — sometimes drawn by another firm — and have discovered that permission alone is not enough to start building. They need the building regulations package to obtain Building Control approval, and they need it to be genuinely buildable so the home they consented can actually be delivered.

The second group is the small-scale developer or investor building one, two or a handful of new homes on an infill plot, a backland site, a subdivided garden or a redundant corner. For this client the building regulations drawings do two jobs: they secure the technical approval every home needs, and — just as importantly — they turn the scheme into information a builder can price accurately and build efficiently. On a development, the difference between a well-drawn and a poorly-drawn building regulations package is measured directly in build cost and programme, because every gap left in the drawings becomes an on-site query, a variation or a claim.

The third group is the client who came to us for the whole project from the beginning — feasibility, design, planning, building regulations and construction — and for whom the building regulations stage is simply the next phase of a single continuous commission. For this client the great advantage is coordination: the home that gained permission is developed straight into a compliant, calculated building by the same team that designed it, with the structure, energy and services already thought through, so the building regulations package is a natural step rather than a re-drawing. This is the smoothest route, and it is the one we recommend, but we are equally happy to pick up a scheme that already has planning permission and take it through Building Control.

Across all three groups the common thread is that a new dwelling cannot be built on a planning permission alone. It needs Building Regulations approval, it needs that approval to be based on a real structural and energy design, and it benefits enormously from having the building regulations drawings produced by a team that understands both the design intent and the technical requirements. That is exactly what Crown offers on Sutton new builds — the architecture, the structure, the building services and the energy strategy under one roof, developed into a single coordinated building regulations package.

The single most important thing to understand about a new home in Sutton is that it needs two separate approvals, granted by two separate processes, and having one does not give you the other. Planning permission is the first: a new dwelling almost always needs full planning permission, because building a new home is not permitted development — it is the creation of a new dwelling, judged on its merits against Sutton's Local Plan and the London Plan. Building Regulations approval is the second: a completely separate consent, dealing not with whether the home is acceptable in its place but with whether it is safely and properly constructed. A great many first-time self-builders are surprised to learn that a hard-won planning permission does not let them start building; the building regulations approval is a distinct hurdle that still has to be cleared.

The two consents look at different things and are judged against different rules. Planning is concerned with land use, design, appearance, scale, density, impact on neighbours' amenity, trees, parking, drainage in the surface-water sense, and the borough's character. Building Regulations are concerned with the technical performance of the building: structural stability, fire safety, resistance to moisture and weather, ventilation and air quality, drainage and waste, energy efficiency and carbon, sound insulation, accessibility, protection from falling and impact, electrical safety and overheating. A home can have planning permission and still fail Building Regulations, or satisfy Building Regulations and lack planning permission — they are genuinely independent, and both are legally required before a new home can be built and occupied.

The drawings for the two consents are correspondingly different, which is why a new build needs both a planning package and a building regulations package. The planning drawings deliberately leave the technical make-up of the building open — they are about appearance and impact, so a wall is a line and a roof is a shape. The building regulations drawings add everything the planning drawings left out: the construction of that wall and how well it insulates, the structure that holds the roof up, the escape route out of the building, the drainage under the floor, the ventilation into every room, and the energy calculation for the whole home. The building regulations set is where the design becomes a specified, calculated building.

In practice the two run in sequence, though they can overlap. Most Sutton new builds obtain planning permission first, then develop the building regulations package once the design is fixed, because it is inefficient to work up the full technical detail of a design that might change through the planning process. But the design decisions that will matter for Building Regulations — the structure, the foundations on the local ground, the energy strategy, the drainage — should be thought about from the very start, so the home that gains permission is one that can meet the Regulations without redesign. That is exactly why we design the structure, energy and services alongside the architecture from feasibility, rather than treating Building Regulations as a problem to be solved after permission.

The London Borough of Sutton was created in 1965 from the merger of the former boroughs of Sutton and Cheam, Beddington and Wallington, and the urban district of Carshalton — five ancient Surrey parishes whose names run deep in the map today. Cheam appears as Cegham in a document of the tenth century and as Ceiham in the Domesday Book of 1086; Sutton itself was Sudtone, the 'south farmstead', recorded in a charter of Chertsey Abbey; and Wallington was Waletone, the 'village of the Britons'. For most of its history this was rural Surrey — a landscape of villages, farms, the watercress beds and mills of the River Wandle, and the chalk downs rising to the south — before the railways arrived and turned it into the leafy commuter suburb it is today. That suburban stock, laid out largely between the wars and in the Edwardian expansion, is precisely the kind of housing that generates new-build opportunities.

The borough's history is unusually rich for outer London, and its most famous building no longer stands. Nonsuch Palace, begun by Henry VIII in 1538 as a hunting lodge meant to have 'none such' equal in Europe, once stood near Cheam and was demolished in the 1680s so its owner could sell off the materials; its site survives as Nonsuch Park, and the palace is commemorated in a heritage mosaic in Sutton town centre. Carshalton is a genuine village around its spring-fed ponds, with the twelfth-century All Saints Church, the early-eighteenth-century Carshalton House of around 1707, Little Holland House, and Honeywood, a seventeenth-century house on the ponds that is now the borough's heritage centre. Cheam has Whitehall, a half-timbered house of the early sixteenth century; and Beddington has Carew Manor and its fourteenth-century church.

For a new-build project this heritage is not just colour — it is technically relevant. Sutton has a number of conservation areas, including Carshalton, Cheam Village, Beddington and Wallington, and scattered listed buildings, and a plot within or near one of these carries extra design and, sometimes, extra consent requirements. More directly for the building regulations stage, the borough's leafy character means many plots have mature trees on or near them, and trees on Sutton's ground have a real effect on the foundation design of a new home. The green setting that makes the borough attractive — Nonsuch, Rosehill and Beddington parks, the Wandle valley, and areas of Metropolitan Open Land and Green Belt on the edges — is also part of the technical context: trees, levels, drainage and ground all follow from where in this landscape a plot sits.

The borough's geology is genuinely relevant to a new-build's foundations and is worth understanding from the outset. Sutton sits across a geological transition: the northern part of the borough rests largely on London Clay, a shrinkable soil that swells and shrinks with moisture; a narrow bed of Thanet sand runs east–west across the middle of the borough from the Croydon direction towards Epsom; and the land rises to chalk in the south, towards the downs, with old chalk pits recorded in the historic parish. This matters because the right foundation for a new home depends entirely on the ground beneath the specific plot — clay behaves very differently from chalk — and it is one of the first things a proper new-build building regulations design has to pin down. Knowing where your plot sits on this map is the starting point for a sound, economical foundation design.

Sutton's housing stock is exactly the kind that produces new-build work. Large parts of the borough are made up of inter-war and Edwardian suburban houses on generous plots, with pockets of bungalows and single-storey buildings that are increasingly seen as under-using their land, and pre-war and post-war estates. It is this pattern — big gardens, wide plots, low-density corners and ageing single dwellings — that generates the four classic Sutton new-build scenarios: the replacement dwelling, the infill house, the backland or garden-land plot, and the small residential development. Each of these produces a new home that needs, once consented, a full building regulations package.

The replacement dwelling — a knock-down-and-rebuild — is one of the most common. An owner holds or buys a tired bungalow or dated house and wants to demolish it and build a larger, modern, energy-efficient home in its place. These schemes succeed at planning where the replacement respects the scale, height and character of the street; at the building regulations stage they bring their own considerations, because demolition is a regulated process in its own right, the new foundations must be designed for the ground exposed once the old building is cleared, and any shared structure with a neighbour engages the party wall process. The building regulations package for a replacement is a complete new-home package, not a minor variation on the old house.

Infill plots — a new house on a gap between properties, on a subdivided wide plot, or on a corner — are the next category. Sutton has many wide suburban plots and corner sites where a carefully designed additional home can sit. At the building regulations stage, infill homes are technically demanding precisely because they are tight against neighbours: the fire separation, the drainage connections, the foundations close to existing buildings and the party wall implications all need careful design. A plot that works at planning has to be made to work technically, and the building regulations drawings are where that is resolved.

Backland and garden-land plots — a new house behind a street frontage, in a back garden, or on land reached by a narrow access — are the most contentious at planning and often the most demanding technically. Access for construction is a real constraint; drainage runs and connections can be long and awkward; and the foundations, often close to boundaries and trees, need particular care. Sutton, like most London boroughs, is cautious about backland and garden development at the planning stage, but where permission is granted the building regulations package has to solve a set of technical problems — access, drainage, fire access, foundations near trees — that a tight, hidden plot throws up. We design these in from the start rather than discovering them on site.

Although the building regulations stage is national and technical, it does not happen in a vacuum: the home being regulated is the home the planning system consented, and Sutton's Local Plan shapes what that home is. Sutton's Local Plan was adopted on 26 February 2018 as a development plan document covering the period to 2031, replacing the earlier Core Strategy of 2009 and Site Development Policies of 2012, and a new Local Plan for the borough is expected to be adopted in around late 2026. Alongside it sit the London Plan — the Mayor's strategic plan for the capital — and the National Planning Policy Framework. Together these decide the size, quality and character of the home whose technical package we then prepare.

Two Local Plan policies matter most to the home's form. Density is dealt with through the plan's housing-density policy (Policy 7), which sets the density ranges the council seeks and reflects the leafy, largely low-density character of much of the borough — so a new home on a suburban plot has to sit comfortably within that character. Residential quality is dealt with through the plan's residential standards policy (Policy 9), which brings the London Plan's internal space standards and its accessible-and-adaptable dwelling requirements into the borough's decision-making. Those space and accessibility standards feed directly into the building regulations stage, because the sizes fixed at planning are the sizes drawn technically, and the accessibility requirement connects to Part M of the Building Regulations, discussed below.

Sutton also has a specific local stance on sustainability that reaches into the technical design of a new home. The council introduced a Technical Guidance Note in June 2018 entitled 'Building a Sustainable Future', giving guidance on its carbon-offsetting policy (Local Plan Policy 31), its biodiversity-accounting policy (Local Plan Policy 36) and its Green Space Factor (Local Plan Policy 33). Sutton has long presented itself as one of the greenest London boroughs — the pioneering BedZED eco-development at Hackbridge is within the borough — and its planning policies push new homes towards low carbon and sustainable drainage. That direction of travel dovetails with the national energy standards a new home must meet under Part L, so a home designed for Sutton's sustainability policies is well-placed to meet the Building Regulations energy requirement.

The practical consequence for the building regulations stage is that the home we take through Building Control is a home already shaped to be well-insulated, low-carbon, appropriately sized and often accessible. We identify the relevant Local Plan policies and any planning conditions at the start, so the building regulations package satisfies the technical Regulations and the planning conditions together — the energy strategy meets both Part L and any planning energy requirement, the drainage meets both Part H and the borough's sustainable-drainage expectation, and so on. Designing to both at once, rather than in isolation, is how the two consents are made to agree.

There are two ways to obtain Building Regulations approval, and for a new dwelling the choice matters. The first is a full plans application, where the detailed drawings, structural calculations and energy assessment are submitted to the building control body and formally checked and approved before work starts. The second is a building notice, a lighter-touch route where no detailed plans are submitted in advance and compliance is judged largely by inspection as the work proceeds. A building notice can be adequate for simple, familiar work on an existing house, but it is the wrong route for a new dwelling, and we strongly recommend the full plans route for every new build.

The reason is certainty. A new home is a large, one-off, technically complex building, and the full plans route means the whole design — the structure, the foundations, the fire strategy, the energy, the drainage — is checked and approved on paper before anyone builds. Problems are found on the drawing board, where they cost a redraw, rather than on site, where they cost demolition and rebuilding. Under the full plans route you receive a formal decision — an approval, often with conditions or requests for further detail — and, on completion of a satisfactory build, a completion certificate. That paper trail is exactly what a mortgage lender, a warranty provider, a future buyer's solicitor and your own peace of mind will want. A building notice, by contrast, leaves the whole risk of a non-compliant new home to be discovered on site.

The building control body itself can be either the local authority's own building control service — Sutton Council's building control team — or a registered building control approver (formerly known as an approved inspector), a private-sector body that carries out the same function to the same national standards. Since the reforms that followed the Building Safety Act, the sector has been reorganised and building control professionals must be registered, but the core choice for an ordinary new house remains: the council's service or a registered private approver, either of which can determine your full plans application and inspect the build. We advise on the right choice for your project and prepare the submission accordingly.

Whichever body is used, the full plans application is the same body of work: a complete set of building regulations drawings, the structural design and calculations, the SAP/Part L energy assessment, and the supporting specifications, together with the appropriate fee. We prepare all of it as a coordinated package, submit it, and manage the exchange with the building control body — answering queries, providing further detail and, where needed, revising drawings — through to a formal approval, so the build can start on a scheme that has already been checked rather than one that is being figured out as it goes.

The Building Regulations for England are a set of national standards organised into Parts, each identified by a letter and each supported by an Approved Document giving practical guidance on how to comply. An extension might engage only a few Parts; a whole new dwelling engages almost all of them, because it is a complete building being created from nothing. Understanding which Parts apply, and what each demands, is the map of the building regulations package — every drawing and calculation in the set exists to satisfy one or more of these Parts. Below we set out the Parts that bite on a new home in Sutton, before going into the most demanding of them — structure and energy — in their own detailed sections.

The headline Parts for a new dwelling are: Part A (structure) — the foundations, walls, floors and roof must safely carry all the loads on the building; Part B (fire safety) — means of escape, fire-resisting construction, fire spread and, for detached houses, fire-service access, plus smoke alarms; Part C (site preparation and resistance to contaminants and moisture) — the ground, damp-proofing, and any contamination on a previously developed plot; Part D (toxic substances); Part E (resistance to the passage of sound) — sound insulation, particularly relevant where a new home adjoins or is close to another, and internal sound separation within the dwelling; and Part F (ventilation) — a designed strategy to keep the air fresh in an increasingly airtight home.

The set continues with Part G (sanitation, hot water safety and water efficiency) — including the water-efficiency target for new homes and the safe delivery of hot water; Part H (drainage and waste disposal) — foul and surface-water drainage, and the connection to the sewer; Part J (combustion appliances and fuel storage) — flues and combustion air where any combustion appliance is installed; Part K (protection from falling, collision and impact) — stairs, guarding and glazing; Part L (conservation of fuel and power) — the energy and carbon standard, dealt with in detail below; and Part M (access to and use of buildings) — the accessibility of the new home, with new dwellings generally required to meet at least the accessible-and-adaptable standard.

Finally there is Part O (overheating) — a requirement, introduced in 2021, that new homes are designed to limit summer overheating, which for a well-insulated, airtight modern home is a genuine design issue that has to be demonstrated; Part P (electrical safety) — the safe design and installation of the electrics, certified by a competent person; Part Q (security) — the security of doors and windows in new dwellings; Part R (in-building physical infrastructure for electronic communications) — provision for high-speed broadband; and the requirements around building work generally. A new-build building regulations package has to address every relevant one of these, and our set is organised so that each Part is answered clearly on the drawings, in the calculations or in the specification, which is exactly what lets Building Control approve it efficiently.

Part A — structure — is the biggest single piece of the building regulations package for a new home, because a new dwelling needs a complete structural design: the whole load path of the building, from the roof down through the frame and into the ground, designed and calculated so that every load has a safe route to the foundations. This is the largest difference between a new build and any alteration, and it is why the structural engineering has to be integral to the drawings, not bolted on afterwards. Crown designs the structure in-house alongside the architecture, so the building regulations package carries a real, calculated frame rather than a hopeful arrangement of walls, and so the structure and the architecture agree with one another.

It starts underground, with the foundations, and the foundations start with the ground — which in Sutton is genuinely variable and genuinely important. The northern part of the borough sits largely on London Clay, a shrinkable soil that swells and shrinks as its moisture content changes; a belt of Thanet sand runs across the middle; and the south rises to chalk. The right foundation depends entirely on which of these the plot sits on, on the bearing capacity of the ground, on the water table, and — critically on the clay — on the presence of trees. Where trees are close to a new building on clay (or where trees have recently been removed), the clay can move enough to damage a shallow foundation through subsidence or heave, so the foundations often have to go deeper, or be designed as reinforced or piled foundations, to reach stable ground and to sit safely within the influence of the trees' roots. A ground investigation is one of the first things a serious new build needs, because it turns the foundation from a guess into a designed, calculated element.

Above ground, the structural design sets out the whole frame: the load-bearing walls or structural frame (masonry, timber frame, steel, or a hybrid), the floor structures (beam-and-block, timber joists, or engineered systems), any steel or timber beams needed over openings or to create open-plan spaces, the lateral stability of the building against wind, and the roof structure. Each element is sized and calculated to carry the imposed and dead loads of a modern home safely, and the whole is coordinated with the architecture so that the structure supports the spaces the design wants and the services can be routed through it. Because there is no existing structure to lean on, every beam, wall and slab is a designed component, and the building regulations submission includes the structural calculations that prove them.

The structural design also has to account for the neighbours and the plot. Where a new home is built close to an existing building — common on Sutton's infill and replacement plots — the foundations and any excavation have to be designed and sequenced so they do not undermine the neighbour, and the Party Wall etc. Act 1996 usually applies (covered in its own section below). Where the site slopes, has made ground from a previous building, or shows signs of contamination, the ground conditions and Part C both come into play. All of this is why the structure cannot be an afterthought that follows the building regulations submission: it is the core of it, designed with the architecture and the specific Sutton ground from the very first drawings, and calculated so Building Control can approve it with confidence.

Part B — fire safety — requires that a new home is designed so that its occupants can escape safely in a fire, so that fire spread within and between buildings is limited, and so that the fire service can reach and fight a fire. For a typical two-storey house these requirements are well-established and readily met, but they still have to be designed in and shown on the building regulations drawings: the escape strategy, the protected routes, the fire-resisting construction where it is needed, and the fire-detection provision. A new build has to demonstrate all of this from scratch, and the drawings are where it is proved.

The core of the domestic fire strategy is a safe means of escape. In a two-storey house, escape is usually achieved through a protected stair and suitable escape windows from the upper floor; as homes get taller — three storeys and above — the requirements become more demanding, with a protected stairway enclosure becoming essential and, above certain heights, further measures such as sprinklers potentially coming into play. Every new home needs a designed system of interlinked smoke and heat alarms to the current standard, and the drawings show the escape routes, the fire-resisting elements and the alarm layout so that Building Control can check the strategy is sound.

Fire spread is the second strand. The Regulations limit how fire can spread across the surfaces of a building, through its structure, and to and from neighbouring buildings — which is why the separation distance to the boundary, the fire resistance of walls close to a boundary, and the materials of the external walls all matter. On a tight Sutton infill or replacement plot, where a new home may sit close to a neighbouring building or boundary, the boundary fire requirements can genuinely shape the design — the extent of glazing on a flank wall, the construction of that wall, and its distance from the line all have to be resolved. These are decisions best made early, because they interact with the planning-approved appearance.

Fire-service access is the third strand: the Regulations require that the fire service can get sufficiently close to a new home to fight a fire, which on a backland or deep plot with a long, narrow access can be a real design consideration rather than a formality. We design the fire strategy as part of the coordinated building regulations package — the escape, the compartmentation and fire resistance, the boundary conditions, the alarms and the access — so that Part B is answered on the drawings and the home is genuinely safe, not just nominally compliant.

Part L — the conservation of fuel and power — is the most demanding and the fastest-moving Part of the building regulations package for a new home, and it is where the greatest value lies in getting the design right early. Every new dwelling in England must comply with Part L, and compliance is demonstrated through an energy calculation for the specific home that models its fabric, its heating and hot water, its ventilation and any renewables, and checks that its predicted carbon emissions, its primary energy use and its fabric performance are all within the national targets. Historically this calculation has been the Standard Assessment Procedure (SAP); the methodology is being updated (towards the Home Energy Model) as the standards tighten, but the principle is the same: the home has to be modelled and shown to meet the targets before it is built, and again on completion.

The current Part L standards for new dwellings, which came into force in 2021, already require a substantial cut in a new home's carbon emissions — an uplift of around 31% against the previous edition — achieved through better insulation, better airtightness, low-carbon heating and, often, renewables such as solar panels. In practice this means a new Sutton home has to be designed with a high-performance building envelope: well-insulated walls, floors and roof with demonstrated U-values, good airtightness, reduced thermal bridging at the junctions, and high-performance glazing. These are fabric decisions that have to be made on the building regulations drawings — as construction build-ups, U-value calculations and junction details — not left for a builder to interpret, because the SAP calculation depends on them and the as-built home has to match what was modelled.

The bigger change is the Future Homes Standard, which raises the bar much higher. It is designed to make new homes produce in the region of 75–80% fewer carbon emissions than under the older standards, and it is set at a level that effectively rules out conventional gas boilers in favour of low-carbon heating such as air-source heat pumps. The transition to the Future Homes Standard is underway, with the updated methodology and the shift from 'Future Homes ready' designs to full compliance; a new home being designed now in Sutton should be designed with the direction of travel firmly in mind, so it is not obsolete on the day it completes and does not need expensive changes partway through the build. Designing for a heat pump, a genuinely airtight and well-insulated fabric and mechanical ventilation from the start is the sensible course.

For a Sutton new build there is a local dimension too. The borough's Local Plan carries a carbon-offsetting policy (Policy 31) and its 'Building a Sustainable Future' guidance, and the London Plan sets its own energy hierarchy — reduce demand first ('be lean'), supply efficiently ('be clean'), then use clean energy ('be green') — with a carbon-offset payment on larger schemes where on-site zero carbon cannot be achieved. A single self-build home is not usually caught by the full major-development energy requirements, but the direction is unmistakable: new homes in Sutton are expected to be low-energy and low-carbon, and the building regulations energy strategy and the planning energy expectation point the same way. We design the energy strategy into the scheme from feasibility and produce the SAP/Part L assessment as part of the building regulations package, so the energy requirement is met by the design rather than fought at the end.

As new homes are built ever tighter to save energy, two Parts of the Regulations become genuinely important that were once almost incidental: Part F (ventilation) and Part O (overheating). They are the necessary counterpart to Part L — the tighter and better-insulated the home, the more its air quality and its summer temperature have to be actively designed rather than left to chance. On a new build both are demonstrated as part of the building regulations package, and both interact with the energy and services design, so they are best resolved together.

Part F requires a designed ventilation strategy that keeps the air fresh and manages moisture, so that a well-sealed home does not become stuffy or damp. The options range from background ventilators with intermittent extract in wet rooms, through continuous mechanical extract ventilation (MEV), to mechanical ventilation with heat recovery (MVHR), which recovers warmth from the outgoing stale air and pairs naturally with a very airtight, low-energy home. The right strategy depends on the airtightness the home is designed to achieve and on the heating system — ventilation, heating and insulation are a single system on a modern new build, and getting the balance wrong gives you either a cold, draughty home or a warm, damp one. The building regulations drawings set out the ventilation strategy and the equipment so Part F is demonstrated and the system can actually be installed.

Part O, introduced in 2021, requires that a new home is designed to limit overheating in summer. For a well-insulated, airtight, glazed modern home this is a real design issue: large areas of glass, particularly facing south or west, can turn a low-energy home into an uncomfortably hot one, and the Regulations require this to be assessed and controlled — through the amount and orientation of glazing, shading, and the provision for removing excess heat (for example openable windows or, where necessary, mechanical means). Demonstrating Part O compliance is part of the building regulations submission, and it is far easier to design out overheating at the drawing stage — through sensible glazing and shading — than to retrofit a cooling solution into a finished home.

The connection between these Parts and Part L is the reason we design them together. A home optimised for energy alone, without regard to ventilation and overheating, can meet Part L on paper and be unpleasant to live in; a home designed as a whole — fabric, airtightness, heating, ventilation and overheating considered as one system — meets all the Parts and is genuinely comfortable. Because we design the architecture, the services and the energy strategy in-house, the ventilation and overheating strategies are developed alongside the fabric and the heating, so the building regulations package is coherent rather than a set of separately-solved problems that fight each other.

A new dwelling creates new demand on the drainage system in two ways — foul water from the home's toilets, kitchen and bathrooms, and surface water running off its new roof, driveway and hard surfaces — and Part H of the Building Regulations requires both to be properly designed. On a new build this is a complete drainage system designed from scratch, not a connection to an existing one, so it is a substantial piece of the building regulations package: the layout of the drains, their falls and pipe sizes, the inspection provision, the connection to the public sewer, and the management of surface water all have to be worked out and shown on the drawings.

Foul drainage has to convey waste reliably to the public sewer (or, rarely, to a designed private system), with the correct falls, pipe sizes, ventilation and access for maintenance. Where the new home is built over or close to an existing sewer, a build-over agreement with the water company (Thames Water in this area) is usually required, and where the site is a backland or deep plot the run to the sewer can be long and needs careful design. The building regulations drawings set out the foul drainage layout and its connection, and coordinate it with the foundations and the structure so the drains and the building do not conflict.

Surface water is where the greater attention now falls, and it connects the building regulations stage to the planning stage and to Sutton's green agenda. Uncontrolled run-off from new development contributes to flooding, and both national policy and Sutton's Local Plan strongly favour sustainable drainage systems (SuDS): rather than piping every drop of rainwater straight into the sewer, SuDS slow, store and where possible soak away surface water close to where it falls — through permeable paving, soakaways, rainwater harvesting, green roofs and small attenuation features. Sutton's ground is relevant here too: on the chalk and sand of the borough infiltration may work well, while on the clay to the north soakaways may be unviable and attenuation or a controlled discharge needed instead — which is exactly why the ground investigation matters for drainage as well as for foundations.

Flood risk is the other side of the water question. The borough is crossed by the River Wandle and its tributaries, and land near watercourses can fall within a higher flood-risk zone; a new home on such a plot faces additional scrutiny at planning and additional care in the technical design — finished floor levels above the flood level and, sometimes, flood-resilient construction. On the building regulations drawings, the drainage and any SuDS have to be shown and coordinated with the levels, the landscaping and the structure — the soakaway clear of the foundations and trees, the attenuation sized for the run-off, the permeable surfaces detailed, and the connections and falls set out. We prepare the drainage design as part of the coordinated package, so it works with the building rather than fighting it on a tight plot.

Beyond the headline Parts, a new dwelling has to satisfy a further group of requirements that, while less prominent, still have to be designed and shown on the building regulations drawings. Part E — resistance to the passage of sound — is most demanding where a new home adjoins or is close to another dwelling, as it often is on Sutton infill and small-development sites: the separating walls and floors between dwellings have to achieve the required sound insulation, demonstrated either by using an approved construction detail or by testing, and a new home also has to meet internal sound-separation requirements between certain rooms. On a detached house the external separation issue does not arise, but internal sound provision still applies.

Part M — access to and use of buildings — governs the accessibility of the new home, and for new dwellings the standard is generally at least the accessible-and-adaptable level (Category 2), which requires level or ramped approach where practicable, a step-free entrance, an accessible WC at entrance level, doorways and circulation sized for wheelchair users, and provision for future adaptation such as a potential stair lift or through-floor lift. This connects directly to Sutton's Local Plan residential standards policy, which brings the London Plan's accessibility requirements into the borough, so the accessible layout expected at planning and the Part M standard at building regulations are designed together. The building regulations drawings show the level thresholds, the accessible WC, the door and corridor widths and the future-adaptation provision.

Part K — protection from falling, collision and impact — covers the everyday safety features of the home: the design of the stairs (their rise, going, headroom and pitch), the guarding to stairs, landings, balconies and any level changes, and the safety glazing in critical locations. These are routine on a well-designed home but they are still checked, and the building regulations drawings show the stair geometry and the guarding so Part K is demonstrably met. Getting the stair right on the drawings is important, because a stair that does not comply is expensive to rebuild once it is in.

Two further Parts complete the set for a new home. Part Q — security — requires that the doors and windows of a new dwelling are designed and made to resist unauthorised entry to a recognised standard, so the specification of the external doors and windows is set out in the building regulations package. Part R — physical infrastructure for high-speed electronic communications — requires that a new home is provided with the in-building infrastructure to connect to high-speed broadband, and increasingly that it is connected to a gigabit-capable network where one is available. None of these Parts is onerous on a well-designed home, but each has to be addressed, and our building regulations set answers every one so nothing is left for Building Control to chase.

A new dwelling needs a complete set of building services — the mechanical, electrical and plumbing (MEP) systems that make a house a home — and, unlike an extension that plugs into an existing house, a new build has to provide all of them from scratch and demonstrate that they comply. The building regulations package therefore includes the heating and hot-water system, the ventilation strategy (Part F, above), the full electrical installation, the water supply and its efficiency (Part G), and the drainage (Part H, above), all coordinated with the architecture and the structure so they fit within the building and can actually be installed as drawn.

Heating and hot water are where new-build design has changed most, driven by Part L and the Future Homes Standard. New homes are moving decisively away from gas boilers towards low-carbon heating — principally air-source heat pumps — because the carbon targets a new home must meet can no longer comfortably be achieved with a conventional gas boiler. That shift affects the whole design: a heat pump needs external space for the unit and a hot-water cylinder inside, works best with a well-insulated, airtight building and larger radiators or underfloor heating, and changes the electrical demand of the home. The building regulations drawings and the SAP assessment have to reflect the chosen system, and the sensible course is to design for a heat pump from the start rather than trying to add it late.

The electrical installation is governed partly by Part P (electrical safety), which requires that electrical work in a new home is designed and installed safely and, in practice, certified by a competent person under a recognised self-certification scheme. Part G brings a water-efficiency requirement for new homes — a calculated limit on water use per person per day, met through efficient fittings — and the safe delivery of hot water to guard against scalding. Part J applies wherever a combustion appliance is installed, governing flues and combustion air. Each of these is addressed in the building regulations package as a drawing, a specification or a note, so the services are demonstrably compliant.

Because Crown designs the building services in-house alongside the architecture and the structure, the services are threaded through the building from the start rather than squeezed in afterwards. The route of the drainage, the position of the heat pump and cylinder, the ventilation ducts, the electrical distribution and the water supply are all coordinated with the structure and the layout, so the building regulations package is genuinely installable and the home performs as modelled. On a new build the services are a major part of the design, not a fit-out detail, and treating them as such on the drawings is what keeps the build smooth.

Many Sutton new builds — replacement dwellings especially — begin with demolition, and demolition is a regulated process in its own right, separate from both planning and the building regulations for the new home. Demolishing a building generally requires a notice to the local authority and, where the building is in a conservation area or is listed, additional planning consents or notifications can apply. Demolition also has to be carried out safely, with proper protection for neighbours and the highway, attention to asbestos (common in older houses and requiring licensed removal), and lawful disposal of waste. We coordinate the demolition requirements with the building regulations and construction programme so the site is cleared lawfully and the new build starts on clean, understood ground.

The Party Wall etc. Act 1996 is a near-constant feature of new builds on Sutton's tighter urban plots, and it is separate again from planning and Building Regulations. Where the new home shares a wall with a neighbour, is built up to or astride the boundary line, or involves excavation for foundations within three metres (or in some cases six metres) of a neighbouring building and to a lower depth than the neighbour's foundations, the Act requires formal notice to the affected owners and, usually, a party wall award agreed through surveyors before that work can start. On infill and replacement plots close to neighbours the Act almost always applies, and the notices carry statutory periods that can delay a start on site if left late — so they have to be identified early, when the foundation design (a Part A matter) reveals how close the excavation comes to the neighbour.

The plot itself brings constraints that both the building regulations design and the construction programme have to respect. Access for construction — getting materials and machinery onto a backland or tightly bounded Sutton site — can be a genuine design driver, not just a logistical afterthought. Existing services crossing the site (water, gas, electricity, drains, and sometimes a public sewer requiring a build-over agreement from Thames Water) have to be located and dealt with. Trees, levels, boundaries and rights of way all shape what can be built where, and several of them feed directly into the building regulations design — the trees into the foundations, the sewer into the drainage, the levels into the drainage and the finished floor levels.

We manage these site and neighbour issues as part of the overall service, because on a new build they are not peripheral to the building regulations stage — they shape it. A party wall matter flows from the foundation design; a build-over agreement flows from the drainage design; a demolition affects the ground the new foundations sit on. By identifying them early and designing and programming around them, we keep the route from a cleared plot to an approved, inspected, completed home as smooth as a real construction project allows.

Although the Community Infrastructure Levy (CIL) is a planning charge rather than a building regulations matter, it belongs in any honest account of a new build because it falls due around the point of commencement — the same point the building regulations approval lets you reach — and because a missed CIL step can stop a build that is otherwise ready to start. CIL is a charge on new floorspace that funds infrastructure, and it applies in Sutton in two layers: the borough's own CIL and the Mayor of London's CIL. Sutton adopted its borough CIL, which came into force on 1 April 2014, charging residential development at £100 per square metre of new floorspace (with a higher rate for convenience retail and a nil rate for several other uses); the charge is subject to annual indexation, so the figure applied is the adopted rate uplifted to the year permission is granted.

On top of the borough CIL, the Mayor of London's CIL applies across Greater London to help fund strategic transport infrastructure. The current Mayoral CIL — MCIL2, which took effect on 1 April 2019 — is charged per square metre of new floorspace at a rate that varies by London band, with Sutton falling in the outer-London band, and it too is indexed. So a new home in Sutton is potentially liable for both the borough CIL and the Mayoral CIL on its net additional internal floorspace. The exact figures depend on the current charging schedules and the indexation in force when the scheme is permitted, which is why we calculate the likely CIL for the specific home rather than quoting a generic number.

For a replacement dwelling the calculation works on the net additional floorspace — broadly, the new floorspace minus the floorspace of the building being demolished, subject to the rules on how long that building has been in lawful use — so a modest replacement may create little net floorspace and therefore little CIL, while a much larger replacement creates net floorspace that is potentially liable. This is a specialist calculation that should never be assumed away, optimistically or pessimistically, because getting it wrong in either direction affects the budget.

Crucially, a self-build exemption is available to someone building their own home to occupy as their principal residence, and it can remove both the borough and the Mayoral CIL — but it is unforgiving of procedure. The exemption has to be claimed and granted before development begins, a commencement notice has to be submitted before any work starts, and the owner then has to live in the home for a defined period (three years) and provide the required evidence, or the relief can be withdrawn and the full charge become payable. Because the CIL formalities and the building regulations commencement fall at the same moment, we handle them together: the building regulations approval is in place, the pre-commencement planning conditions are discharged, and the CIL exemption and commencement notice are lodged, so the build can lawfully start without a missed step turning into an unexpected bill.

The building regulations package for a Sutton new build is a coordinated set of drawings, calculations and specifications, developed from the approved planning design, that together demonstrate compliance with every relevant Part of the Regulations. It is the second of the three drawing stages — after the planning drawings and before the construction drawings — and it is where the home stops being a picture and becomes a specified, calculated building. Below is what a complete package contains, though the exact content is scoped to the specific home.

The drawings themselves comprise general-arrangement plans, elevations and sections marked up with the technical information Building Control needs: the construction build-ups for the floors, walls and roof with their insulation and U-values; the damp-proofing and moisture-resistance details (Part C); the drainage layout with falls, pipe sizes, inspection chambers and the sewer connection (Part H); the ventilation strategy and equipment (Part F); the stair geometry and guarding (Part K); the fire strategy with escape routes, fire-resisting construction and alarm positions (Part B); the accessible layout and level thresholds (Part M); and the key construction details at the junctions where performance is won or lost — eaves, verges, thresholds, window and door reveals, and wall-to-floor and wall-to-roof junctions.

Alongside the drawings sit the calculations and reports. The structural design and its supporting calculations prove the foundations and the frame (Part A), informed by the ground investigation. The SAP/Part L energy calculation models the whole home and shows it meets the carbon, primary-energy and fabric targets, and produces the predicted energy rating. Where the site requires them, further reports — a drainage or SuDS strategy, a ground or contamination assessment, an overheating (Part O) assessment — are included. And a written specification pins down the materials and the standards of workmanship, so that the performance modelled in the calculations is actually built.

The value of preparing this as one coordinated package, by the team that designed the home, is that everything agrees. The structure supports the architecture; the services fit within the structure; the energy calculation matches the fabric on the drawings; the drainage is clear of the foundations; and the fire strategy, the accessibility and the acoustics are all consistent with the layout. A building regulations package assembled piecemeal — an architect's drawings, a separate engineer's calculations and a separate energy assessor's SAP that were never reconciled — is where clashes hide, and clashes surface on site. Our coordinated package is what lets Building Control approve efficiently and the builder build without constant queries.

The building control process for a new home begins where the planning process ends. With planning permission granted, we develop the building regulations package — the drawings, the structural calculations and the SAP/Part L assessment — from the approved design, resolving the technical detail that planning deliberately left open. On many new builds this is also the point at which a ground investigation is commissioned (if it was not done at feasibility), because the foundation design that anchors the whole structural submission depends on knowing the ground on the specific plot.

We then submit a full plans application to the chosen building control body — Sutton Council's own building control service or a registered building control approver — with the drawings, the calculations, the energy assessment, the specifications and the fee. The building control body checks the submission against every relevant Part of the Regulations and issues a decision: usually an approval, often with conditions or requests for further detail on particular points, which we then resolve. This checking-on-paper stage is the whole point of the full plans route: the design is proved compliant before anyone builds, so problems are found and fixed cheaply on the drawings rather than expensively on site.

In parallel, the pre-commencement matters have to be cleared before work can lawfully start. That means discharging any pre-commencement planning conditions attached to the permission (materials, drainage, tree protection, contamination and so on), and completing the CIL formalities — including any self-build exemption claim and the commencement notice — before development begins. Only when the building regulations approval is in place, the pre-commencement conditions are discharged and the CIL steps are lodged can construction lawfully start, which is why this stage has to be programmed deliberately rather than rushed at the last minute.

Construction then proceeds with the building control body inspecting at key stages — commencement and excavation, the foundations before they are covered, the damp-proof course and drainage, the structural frame, the insulation and airtightness, and completion — and issuing a completion certificate when the finished home is confirmed compliant. That completion certificate is the document that proves the home was built to the Regulations, and it is what lenders, warranty providers and future buyers will look for. Throughout, we keep the drawings, the calculations, the planning conditions and the building control record aligned, so the home that is built is the home that was consented and approved.

The cost of the building regulations stage of a Sutton new build has a few distinct components, and it helps to see them separately. There is our design fee for preparing the building regulations package — the drawings, the structural design and calculations, and the SAP/Part L energy assessment — which we scope to the specific home and quote as a clear, staged fee before work begins. There is the building control fee itself, payable to the council or the approved inspector, which depends on the size of the home and the route chosen. And there are the specialist inputs the package draws on — principally the ground investigation, and sometimes a drainage, contamination or overheating assessment — each a modest cost line against the build but a genuine one.

The building control fee for a new dwelling is generally split into a plan-check element (paid when the full plans application is submitted) and an inspection element (covering the site visits through construction), or charged as a combined fee; the exact figure depends on the number and size of the dwellings and on whether the council or a private approver is used. It is a real cost but a modest one against the build, and it buys the certainty of a checked-and-approved design and a completion certificate at the end. We set out the building control fee, our design fee and the specialist costs at the start, so the building regulations stage is budgeted rather than a surprise.

On timescales, preparing the building regulations package for a single new home typically takes a few weeks, depending on the complexity of the structure and the services and on how much of the technical thinking was already done at the design stage. A full plans application is then determined by the building control body within a statutory period (with a common target of a few weeks), though queries and requests for further detail can extend the exchange. Because the building regulations package can be developed as soon as the design is fixed — and, where sensible, worked up in parallel with the tail end of the planning process — the stage need not add much to the overall programme if it is planned rather than left until permission arrives.

The most important point about the cost of the building regulations stage is where money is actually saved. A thorough, coordinated building regulations package — with a real structural design, a proper energy strategy and every Part answered on the drawings — is the single most cost-effective investment on a new home after the design itself, because it is what makes the build predictable. Money is lost not on good building regulations drawings but on the absence of them: on new builds that go to site with only planning-level drawings and then bleed money through unpriced work, on-site improvisation, failed inspections and reworks. The building regulations package is what turns a planning permission into a buildable, priceable, inspectable home.

Understanding where the building regulations stage goes wrong is the best way to make sure yours does not, and on a new home the failures cluster around a handful of familiar mistakes. The most common is treating the planning permission as the finished design and going to site without a proper building regulations package — no U-values, no foundation design, no fire strategy, no drainage layout — and relying on the builder to 'work it out'. This is where new-build budgets and programmes go wrong: the technical decisions get made on site, ad hoc, expensively, and often non-compliantly, and the failed inspections and reworks that follow cost far more than the drawings would have.

The second common mistake is a foundation designed without knowing the ground. On Sutton's variable geology — clay to the north, chalk to the south, a Thanet sand belt across the middle, and trees on many plots — a standard foundation detail applied without a ground investigation is a real risk, and foundation problems are among the most expensive of all to put right once the building is up. The answer is a ground investigation and a foundation designed for the specific plot, which is exactly why we treat the ground as the starting point of the structural submission rather than an afterthought.

The third is an energy strategy bolted on at the end. Because Part L compliance depends on the fabric, the airtightness, the heating and the ventilation of the whole home, an energy strategy that is not designed in from the start often means either a home that fails its SAP target or one that meets it only through expensive late changes. Designing the fabric and the low-carbon heating for Part L and the direction of the Future Homes Standard from feasibility — rather than commissioning a SAP calculation at the end and hoping it passes — is what avoids this. The same applies to overheating (Part O), which is far cheaper to design out through sensible glazing than to solve with retrofitted cooling.

The fourth cluster is coordination failure: an architect's drawings, an engineer's calculations and an energy assessor's SAP that were produced separately and never reconciled, so the drainage clashes with the foundations, the structure fights the layout, or the as-built fabric does not match the SAP model. This is the failure that a single coordinated team is designed to prevent — and it is why we design the architecture, the structure, the services and the energy together and issue one coordinated building regulations package, so the home that is approved is the home that is built.

To make the process concrete, consider a common Sutton scenario: a family holds a tired inter-war bungalow on a decent plot in a suburban Carshalton street, has obtained planning permission to demolish it and build a new two-storey, energy-efficient family house in its place, and now needs the building regulations package to get the home approved and built. It is exactly the kind of replacement-dwelling project the borough's new-build market is built on, and exactly the kind where the building regulations stage decides whether the consented home can actually be delivered.

The plot sits on the northern, London Clay part of the borough, with a mature oak in a neighbour's garden nearby, so the first move is a ground investigation and an arboricultural check, because both drive the foundation design. On the clay and close to the tree, the foundations are designed as deep trench-fill or, if the loads and the tree influence require it, reinforced or piled foundations that reach below the zone of seasonal soil movement and sit safely within the tree's root influence — all set out with the structural calculations that will anchor the full plans submission. The demolition of the bungalow is notified and programmed, with an asbestos check first.

The rest of the building regulations package develops the approved design into a compliant building. The fabric is designed to a high standard — well-insulated walls, floor and roof with demonstrated U-values, good airtightness and reduced thermal bridging — and the home is heated by an air-source heat pump with mechanical ventilation, so the SAP/Part L calculation shows it meeting the carbon and fabric targets with the Future Homes Standard direction in mind. The drainage is designed with a SuDS soakaway (checked against the clay's poor infiltration, and switched to attenuation and a controlled discharge if the ground proves unsuitable), clear of the foundations and the tree; the fire strategy, the accessible ground floor (Part M), the stairs and guarding (Part K), the sound provision, the overheating check (Part O) and the security and broadband provision (Parts Q and R) are all resolved on the drawings.

The full plans application then goes to the chosen building control body — Sutton Council's service or a registered approver — with the drawings, the structural calculations, the SAP assessment and the specification. It is checked and approved on paper, the pre-commencement planning conditions are discharged, and the CIL self-build exemption and commencement notice are lodged before work starts. Construction proceeds with staged inspections — foundations, drainage, structure, insulation and airtightness, completion — and ends with a completion certificate. Because the same coordinated team designed the home, engineered the structure, sized the services and produced the SAP, the building that is approved and inspected is the building that was consented — which is the difference between a replacement dwelling that is delivered smoothly and one that lurches from surprise to surprise on site.

Crown Architecture designs, engineers and draws new homes across Sutton and the surrounding boroughs, and we do it as a single coordinated service: the architecture, the structural and civil design, the building services and the energy strategy all under one roof. On the building regulations stage of a new build this matters more than on almost anything else, because a new-build building regulations package is where a home has to be proved compliant across every Part at once — structure, fire, energy, drainage, ventilation, sound, access, overheating — and every one of those is interdependent. Produce them separately, through an architect here, an engineer there and an energy assessor somewhere else, and they clash; produce them together, and the package is coherent, compliant and buildable.

We prepare the complete building regulations package — the full plans drawings, the structural design and calculations, and the SAP/Part L energy assessment — and we prepare it to be genuinely buildable, so it feeds straight into the construction package and a builder can price and build from it with confidence. If you already have planning permission drawn by another firm, we are glad to pick the scheme up and take it through Building Control; if you come to us from the start, the building regulations stage is simply the natural next phase of a single continuous commission, with the structure and energy already thought through.

We know the Sutton picture: the borough's clay, chalk and Thanet-sand geology and what it means for foundations; the trees on its leafy plots and how they shape a foundation design; its conservation areas and heritage; its Local Plan and 'Building a Sustainable Future' sustainability agenda; its CIL from April 2014 and the Mayoral CIL alongside it — as well as the national Building Regulations, the SAP/Part L energy standard and the Future Homes Standard that every new home must meet. We use that knowledge to design a home that is compliant by design rather than compliant by luck, and to run the full plans application and the pre-commencement steps so the build starts cleanly.

Just as importantly, we are straightforward to work with. We tell you honestly what the building regulations stage involves for your specific home, we quote a clear, staged fee before any work begins, and we prepare a coordinated, self-consistent building regulations package that Building Control can approve and a builder can build. Then we stay with the project — managing the full plans application, discharging the pre-commencement conditions, handling the CIL and self-build exemption timing, and preparing the construction information the build needs — so you have a single, accountable point of contact from the planning permission through Building Control to the completion certificate.

If you are building a new home in Sutton — a replacement dwelling, an infill house, a backland or garden plot, or a small development, anywhere in Sutton, Cheam, Carshalton, Wallington, Beddington, Belmont, Hackbridge or Worcester Park — and you need the building regulations drawings that turn your planning permission into a buildable, approved home, send us the address, the permission and what you have in mind, and we will tell you exactly what the building regulations stage needs and prepare the full package to deliver it.