Double Storey Extension Cost in SW16

Architectural drawings cost in SW16 depends on the route — feasibility sketch, planning-stage drawings, lawful-development evidence, or a full technical package. Crown Architecture scopes each stage transparently so you only pay for what you actually need next. Send the address or postcode and a one-line brief and we can quote the realistic stages before any drawing begins.

Architectural plans cost in SW16 is staged: a planning-stage plan set is priced separately from building-regulation and structural packages, so the homeowner stays in control of how far the project goes before further fees are committed. Complexity, sensitivity (conservation/Article 4), and how complete the starting information is all influence the figure.

A planning consultant for SW16 is typically scoped to the proposal: a short strategy note for a straightforward householder scheme; a fuller appraisal, policy review, and pre-application input where the site is sensitive or a refusal would cost time. Crown quotes this in stages rather than as a single bundled number.

Whether a SW16 project needs planning permission depends on the property, the scope, and any local constraints — conservation area, Article 4 direction, listed-building consent, Lambeth planning authority context local plan considerations. Some changes proceed under permitted development; others need a householder or full planning application. We confirm the route on paper before drawings are scoped.

Permitted development can be the fastest route for modest SW16 projects — but only where dimensions, siting, and impact stay within the limits, and where no Article 4 direction has removed the right. A Lawful Development Certificate is often worth securing so the position is unambiguous for a future sale.

Planning drawings for a SW16 project typically take from a couple of weeks for a straightforward householder scheme to several weeks for a sensitive or complex site. The total clock to a decision includes Lambeth planning authority context's statutory consultation period. We map the realistic timeline up front so there are no surprises.

Yes. Crown Architecture prepares building-regulation drawings and specifications for SW16 homes, coordinated with the structural and architectural packages so the technical detail aligns with what was approved. The building-regulation stage can often run in parallel with planning once the design is fixed.

Yes. Crown Architecture & Structural Engineering Ltd coordinates structural calculations for SW16 projects where openings, beams, foundations, or roof alterations are involved. We sequence the structural and architectural design together so the two sides stay consistent through to construction.

Yes — Crown regularly works across SW16 and nearby areas including SE27, SW2, CR4, SW17, SW12, CR44. The same locally-aware approach applies: real property stock, real local-plan context, and a clear route to approval before drawings are scoped.

For a useful SW16 quote, send the full address or postcode, photos inside and out, any existing plans or estate-agent floor plans, and a short description of what you want to achieve. That is enough to advise on the likely route before a full drawing package is scoped.

Yes. Crown Architecture & Structural Engineering Ltd supports homeowners in SW16 with double storey extension cost, local context review, and quote-first next-step guidance.

This page connects double storey extension cost to Streatham, Norbury, Thornton Heath, Streatham Park, Furzedown, Streatham Vale, Pollards Hill, Lambeth, nearby postcode districts, common residential project types, and the likely route through planning or technical design.

Yes. We check the address, property type, project scope, and local planning context before advising whether the project should start with planning drawings, permitted development evidence, a lawful development certificate, or technical information.

Yes. Where the project needs technical drawings, building regulation information, structural calculations, or builder-ready detail, we keep that next stage visible from the first enquiry.

Send the full postcode, property address, project type, photos, rough dimensions or existing plans if available, and any council, builder, or building control questions already raised.

Use the quote form, call or text +44 7950 114633, or email info@crownarchitecture.co.uk. The correct phone link is tel:+447950114633.

Yes. Crown Architecture & Structural Engineering Ltd supports SW16 homeowners with architectural drawings and planning support, drawing coordination, and clear next-step guidance for residential projects of all sizes.

It depends on the property and scope. Some work proceeds under permitted development or a Lawful Development Certificate; other changes need a full application to Lambeth planning authority context. We review your specific case before any drawings are scoped.

For most SW16 homes the planning authority is Lambeth planning authority context. Their validation requirements and local policies shape how the proposal should be drawn and justified.

Parts of SW16 and nearby areas are covered by conservation designations or Article 4 directions, which can restrict permitted development. We confirm the designation early so the route and drawings reflect it.

The full address or postcode, photos inside and out, any existing or estate-agent plans, and a short description of what you want to achieve. That is enough to advise on the likely route first.

Timelines depend on the route. Permitted-development and certificate routes can be quicker; full planning runs to the authority's statutory period. Building-regulation and structural stages can often run alongside once the design is fixed.

If the work removes walls, forms openings, or alters the roof, structural calculations are usually required. Crown can coordinate the structural design alongside the drawings so the two stay aligned.

Typically existing and proposed plans, elevations and sections, a site and location plan, and the supporting context needed for the chosen route — with technical detail added where the project requires it.

Fees reflect route complexity, project scale, and how complete the starting information is. Stages are scoped transparently so you only pay for the route you need.

Yes. We can align building-regulation information, structural coordination, and construction-stage requirements so the package stays coherent from enquiry through to build.

We keep both routes in view and, where useful, secure a Lawful Development Certificate so the position is unambiguous — protecting your schedule and any future sale.

The package reflects the local property type, the safest route for SW16 projects is to check local planning constraints, previous alterations, permitted development limits, and building regulation implications before committing to a package, and Lambeth planning authority context expectations, rather than a generic template that ignores planning, structure, access, or buildability.

Yes — we regularly work across SW16 and nearby areas including SE27, SW2, CR4, SW17, SW12, CR44, applying the same locally-aware approach to each.

We regularly support extensions, loft conversions, garage conversions, internal reconfiguration, planning drawing packages, and technical drawing work for homeowners in SW16. This includes single-storey rear extensions, side-return extensions, double-storey extensions, dormer and mansard loft conversions, hip-to-gable loft conversions, rooflight loft conversions, full garage conversions, garden rooms, outbuildings, and change-of-use applications where the project involves residential alterations.

Yes. Early discussion helps identify the most suitable route and whether the project needs planning drawings, a lawful development approach, permitted development evidence, or technical progression. We offer a free initial consultation to review your brief and advise on the likely drawing requirements before any fee commitment.

Send the address or postcode, the property type, photos of the front and rear of the property, any existing plans or sketches, and a short summary of the proposed works. If you have a surveyor's report, title plan, or pre-application advice from the council, include those too. These details help us identify the likely drawing package and any planning or technical issues to consider first.

They can. Conservation areas, Article 4 directions, neighbouring properties, roof form, boundary relationships, parking, access, and local validation requirements may all affect how a SW16 residential proposal should be drawn and explained. We check these constraints at the outset so the drawing package addresses them from the first design iteration rather than after a refusal or amendment request.

Yes. If the project needs technical drawings, building control information, structural calculations, or a clearer package for builders, the initial drawing route can be developed into the next stage. Many homeowners start with planning drawings and then progress to a full building regulation and structural package once consent is granted. We coordinate both stages so the technical drawings are consistent with the approved planning scheme.

No. Crown Architecture & Structural Engineering Ltd provides quote-led residential drawing support across London, the South East, and surrounding commuter counties, including SW16, without claiming a separate local office on each area page. Our registered office is at 71–75 Shelton Street, London WC2H 9JQ, and we carry out measured surveys and site visits across the service area.

A standard householder planning package for SW16 includes existing and proposed floor plans, existing and proposed elevations (front, rear, and both sides), a site location plan at 1:1250 scale, a block plan at 1:500 scale, and a completed application form with the required ownership certificates. Where conservation area or listed building constraints apply, a design and access statement or heritage statement may also be required.

Typically 2–4 weeks from the initial measured survey to a complete planning application submission for a straightforward householder project in SW16. More complex projects — conservation area schemes, basement proposals, or projects requiring structural engineering input — may take 4–8 weeks. The statutory determination period for a householder application is 8 weeks from validation by the local authority.

Planning drawings show the design intent and its relationship to the site, neighbours, and street scene — they answer the question "is this acceptable development?" Building regulation drawings are technical construction documents that show how the building will comply with the Building Regulations (structure, thermal performance, fire safety, drainage, ventilation) — they answer the question "is this safe and compliant to build?" Most SW16 projects need both.

Most extensions, loft conversions, and internal structural alterations in SW16 require structural calculations by a qualified structural engineer. This includes steel beam sizing (RSJs), foundation design, load-bearing wall removal calculations, chimney breast removal support, and loft floor strengthening. Crown Architecture includes structural engineering as part of our integrated service — we coordinate the structural design with the architectural drawings so the package is consistent.

A Lawful Development Certificate (LDC) is a formal confirmation from the local authority that your proposed works fall within permitted development rights and do not require planning permission. In SW16, an LDC is strongly recommended for any project relying on permitted development — particularly rear extensions, loft conversions, and outbuildings. It provides legal certainty, satisfies mortgage lender requirements, and avoids enforcement risk. The fee is lower than a full planning application and the process is quicker.

Fees depend on the scope and complexity of the project. As a guide for SW16: a planning-only package for a straightforward rear extension typically starts from around £1,200–£1,800; a combined planning and building regulation package from £2,000–£3,500; and a full architectural service including structural engineering from £3,000–£6,000+. We provide fixed-fee proposals after a free consultation so there are no surprises. VAT and local authority application fees are additional.

Permitted development (PD) rights allow certain building works to proceed without a planning application, subject to size limits, height restrictions, and material constraints set out in the Town and Country Planning (General Permitted Development) Order. In SW16, PD rights may be restricted or removed in conservation areas, by Article 4 directions, or where previous extensions have used up the available allowance. We check PD eligibility at the start of every project and advise on whether a full planning application or a Lawful Development Certificate is the better route.

Yes. If a planning application is refused by the SW16 local authority, we can review the refusal reasons, advise on whether an amended resubmission or a planning appeal is the stronger route, and prepare the revised drawings or appeal documentation. Many refusals can be resolved with a targeted design amendment that addresses the officer's specific concerns without abandoning the project intent.

If your project involves work on or near a shared wall, boundary, or excavation within 3–6 metres of a neighbour's foundations, the Party Wall etc. Act 1996 applies. This is common in SW16 for terraced and semi-detached properties. We advise on party wall obligations at the design stage and can introduce experienced party wall surveyors where formal notices and agreements are required before construction begins.

After planning consent is granted, the next steps are typically: building regulation drawings and structural calculations (if not already prepared), a building control application (either via the local authority or an approved inspector), contractor procurement, and any required party wall agreements. Planning consent is usually valid for three years, so there is time to arrange the technical stages, but starting the building regulation package promptly is advisable to avoid delays when the builder is ready to start on site.

Yes. Crown Architecture & Structural Engineering Ltd holds professional indemnity insurance and public liability insurance appropriate to the scale of residential projects we undertake. We are registered at Companies House under company number 16297850, with our registered office at 71–75 Shelton Street, London WC2H 9JQ. Our telephone number is +44 7950 114633.