Crown Architecture & Structural Engineering
House Extension Plans in Wandsworth
Extending a home in Wandsworth requires plans that work within the constraints of the existing building, neighbouring properties, and Wandsworth's local planning policies. Crown Architecture prepares house extension plans — from single-storey kitchen extensions to multi-storey side or rear projects — tailored to your specific property and the requirements of London Borough of Wandsworth.
Project imagery
House Extension Plans in Wandsworth — project examples
Residential project, drawing-package, and planning context imagery relevant to this service and borough.
Local planning context
Planning in Wandsworth
The London Borough of Wandsworth receives a large volume of householder applications each year. The ones that succeed first time are typically those that have anticipated the validation requirements and addressed the most common officer questions before submission.
Permitted development rights allow many extensions and loft conversions in Wandsworth to proceed without a planning application, but the limits on height, depth, and materials are specific. A Lawful Development Certificate is the safest way to confirm the position, particularly for properties in conservation areas or affected by Article 4 directions.
Permitted development limits in Wandsworth are fixed nationally, but their application to a specific property can be complex: cumulative extensions, loft additions already made, and any prior consents all count. We carry out a permitted development assessment as part of the initial project briefing so the route is confirmed before design work begins.
Get expert planning advice for your Wandsworth project — free initial consultation.
Get a Free QuoteHeritage designations
Conservation Areas in Wandsworth
If your property sits within or near one of Wandsworth's 45 conservation areas, your application will be assessed partly on character, materials, and how it reads in the street scene. Conservation areas in Wandsworth include Charlwood Road and Lifford Street, Clapham Common, Coalecroft Road, Dover House Estate.
Conservation areas affect what is permitted under the General Permitted Development Order, often restricting changes to windows, doors, cladding, satellite dishes, and side extensions without a planning application. In some parts of Wandsworth, works that would be automatic elsewhere require full permission and design justification.
Conservation area designation in Wandsworth does not mean that development is not possible — it means that the design, materials, and overall approach need to demonstrate that the area's character is preserved or enhanced. Most extension and loft conversion types are achievable with the right design treatment.
- Charlwood Road and Lifford Street
- Clapham Common
- Coalecroft Road
- Dover House Estate
- Heaver Estate
- Magdalen Park
- Mellison Road
- Nightingale Lane
- Oxford Road
- Parkfields
- Putney Heath
- Roehampton Village
Service information
House Extension Plans
Our extension plans service for Wandsworth homeowners begins with a site appraisal that confirms the planning route, the permitted development envelope, and the likely constraints for the specific proposal. We present design options before fixing on the approach, so you can make an informed decision.
House extension plans for Wandsworth properties need to address the specific constraints of the site: plot depth, proximity to neighbouring windows, the character of the street, and any conservation area or Article 4 designation that changes what is achievable.
Once the design is agreed, we take the extension plans through planning permission (or permitted development confirmation), building regulation approval, and the construction-issue stage, providing a coordinated set of information for each phase.
Service information
Our Process for Wandsworth Projects
Submissions to London Borough of Wandsworth are made via the Planning Portal using the householder application form, accompanied by the full drawing set and any required supporting documents. We monitor the application throughout the assessment period, responding to requests for information and liaising with the case officer as required.
All projects in Wandsworth begin with a free consultation call where we discuss the brief, the property, and the likely planning route. We then issue a detailed fixed-fee proposal before any survey or design work begins, so there are no surprises on costs.
- Free initial consultation and brief assessment
- Fixed-fee proposal covering all agreed services
- Measured survey of the existing property
- Design options and client review
- Planning drawing preparation
- Submission to London Borough of Wandsworth
- Officer liaison and application management
- Post-consent building regulation package
Service information
Why Choose Crown Architecture in Wandsworth
Crown Architecture & Structural Engineering Ltd has worked across all 32 London boroughs including Wandsworth. Our experience with London Borough of Wandsworth's planning requirements, validation standards, and officer expectations means we can prepare applications that progress efficiently and with a high first-time approval rate.
We are a full-service practice — architecture, structural engineering, and planning consultancy under one roof. For Wandsworth projects, this means the planning drawings, structural calculations, and building regulation package are all coordinated by the same team rather than produced by separate consultants whose information does not align.
Our registered office is at 71–75 Shelton Street, London WC2H 9JQ (company number 16297850). We are contactable at +44 7950 114633 and cover all projects across London and the home counties, including all areas of Wandsworth.
Service information
Housing Stock and Local Character in Wandsworth
Wandsworth is a prosperous inner-south-west London borough known for Battersea, Clapham, and Tooting, with a high density of Victorian terraces, significant riverside development, and well-regarded conservation areas. This character shapes what planning applications are likely to succeed and how they need to be presented to London Borough of Wandsworth.
The residential stock in Wandsworth consists principally of Victorian and Edwardian terraced housing throughout, Georgian and Regency townhouses in Battersea and Clapham, and growing new-build along the Thames in Wandsworth and Nine Elms. Understanding how the existing building type responds to extension or alteration is the starting point for any design brief — it defines the structural approach, the planning sensitivities, and the opportunities for the project.
Key areas within Wandsworth where we regularly work include Battersea, Clapham, Tooting, Balham. Each of these areas has its own micro-character, planning history, and in some cases specific conservation area or Article 4 designations that affect what is achievable on any given street.
Service information
House Extension Plans — Further Information
Extension plans for Wandsworth homes are most effective when they address both the planning question and the construction question simultaneously. A plan that wins planning permission but requires significant redesign for building regulation compliance wastes time and can cause costs to escalate. Our integrated approach coordinates both from the first design stage.
For Wandsworth homeowners who are also considering loft conversion or basement work alongside an extension, we can prepare a masterplan that shows how all the works relate to each other — a useful planning tool both for staging the works and for showing London Borough of Wandsworth the overall intention if the planning applications are to be submitted simultaneously or in sequence.
Service information
Building Regulations in Wandsworth
Post-completion, London Borough of Wandsworth building control issues a Completion Certificate confirming that the work complies with the Building Regulations. This document is required when selling a Wandsworth property where significant works have been carried out, and is often requested by mortgage lenders. We advise all clients to keep their Completion Certificate with their title deeds.
Building regulation approval in Wandsworth runs in parallel to planning consent — they are two separate legal processes. We manage both for clients who wish to use Crown Architecture for the full project, or we can work alongside a client's own building contractor or structural engineer where preferred.
Common questions
House Extension Plans in Wandsworth — frequently asked questions
Answers to the planning, design, and regulatory questions we are most often asked about House Extension Plans in Wandsworth.
Can I build a two-storey extension in Wandsworth?
Yes. Two-storey rear extensions in Wandsworth require planning permission in most cases (only the rarest circumstances fall within permitted development for two storeys). London Borough of Wandsworth assesses two-storey extensions against their relationship to the rear boundary, impact on neighbouring light, and the scale and design relative to the host building and street. We prepare the full planning application including a design justification where required.
Do I need party wall agreements for an extension in Wandsworth?
If your Wandsworth extension involves building on or near the boundary with a neighbouring property, excavating within three or six metres of a neighbour's foundations, or carrying out works to a shared wall, the Party Wall etc. Act 1996 applies. You must serve notice on adjoining owners before works start. We can introduce a party wall surveyor from our network to manage the process.
What is an orangery or extension and what planning applies in Wandsworth?
Orangeries and conservatories attached to houses in Wandsworth are generally treated the same as extensions for planning purposes. The key distinction for building regulations is whether the space is heated and thermally separated from the house — fully integrated heated extensions have full building regulation compliance requirements, while traditional glazed structures meeting specific criteria may have exemptions.
How long does it take to get planning permission for an extension in Wandsworth?
From starting the drawings to receiving a planning decision in Wandsworth, a typical householder application takes twelve to twenty weeks. This includes two to four weeks for drawings, one to two weeks for submission and validation by London Borough of Wandsworth, and eight weeks for the application to be determined. Our programme is discussed and agreed at the start of each project.
How far back can I extend my house in Wandsworth without planning permission?
Under current permitted development rights, a detached house in Wandsworth can extend up to eight metres to the rear (single storey) or three metres (two storey) without planning permission, subject to the prior approval notification scheme for larger extensions. Semi-detached and terraced houses can extend up to six metres (single storey) or three metres (two storey) via the same scheme. These limits assume no conservation area or Article 4 direction applies.
What is the prior approval notification scheme for large extensions in Wandsworth?
Under the neighbour consultation scheme, extensions between four and eight metres for detached houses, or three and six metres for other house types, can proceed as permitted development in Wandsworth subject to a prior approval notification to London Borough of Wandsworth. Neighbours are consulted and the council assesses the impact on amenity. Most applications are approved, but the process takes up to eight weeks from notification.
Can I extend my house in Wandsworth if it is in a conservation area?
Yes, but permitted development rights are often restricted or removed in conservation areas in Wandsworth. Rear extensions in conservation areas typically cannot exceed one storey and must use materials that match or complement the host building. In some conservation areas, even single-storey rear extensions require a planning application rather than being automatically permitted. We confirm the specific restrictions for your property as part of the initial assessment.
What is a side return extension and does it need planning permission in Wandsworth?
A side return extension fills in the narrow strip of land at the side of a Victorian or Edwardian terraced house, typically extending the ground floor outwards. In most parts of Wandsworth, side return extensions of a single storey can be built under permitted development, but in conservation areas they often require planning permission. The extension typically needs to be set back from the front elevation and use matching materials.
What is an under-build extension and does it need planning permission in Wandsworth?
An under-build or basement extension involves excavating below ground level to create a new habitable space. In Wandsworth, basement extensions almost always require planning permission and are subject to additional assessment around structural stability, flood risk, and impact on neighbouring properties. London Borough of Wandsworth has specific policies on basement development and the drawings must address these comprehensively.
How do I know how big an extension I can build before planning permission is needed in Wandsworth?
The permitted development limits for extensions in Wandsworth depend on the property type, existing extensions, plot constraints, and whether any designations apply. We confirm the exact limits as part of our initial assessment — which is included in our design service. We will also tell you when a Lawful Development Certificate is advisable to formally confirm the position before or after works.
Who is the planning authority for Wandsworth?
The planning authority for Wandsworth is London Borough of Wandsworth. All planning applications for residential and commercial developments in Wandsworth are submitted to and determined by London Borough of Wandsworth, which also provides pre-application advice and manages the planning enforcement function for the borough.
What types of development need planning permission in Wandsworth?
In Wandsworth, planning permission is required for: new buildings; extensions that exceed the permitted development limits; changes of use (e.g. from residential to commercial); demolition of protected structures; and any works that affect a listed building or its curtilage. Smaller extensions, loft conversions within volume limits, and outbuildings within the curtilage may fall within permitted development, but constraints apply in conservation areas and Article 4 zones.
Is Crown Architecture registered with Companies House?
Yes. Crown Architecture & Structural Engineering Ltd is registered at Companies House under company number 16297850. Our registered address is 71–75 Shelton Street, London WC2H 9JQ. We carry professional indemnity and public liability insurance appropriate to the scale of residential and small commercial projects we undertake.
What are the core contact details for Crown Architecture?
Crown Architecture & Structural Engineering Ltd can be reached by telephone at +44 7950 114633 or via our website contact form. Our address is 71–75 Shelton Street, London WC2H 9JQ. We cover all projects in Wandsworth and across London and the home counties.
How does Crown Architecture price house extension plans services in Wandsworth?
Our fees for house extension plans in Wandsworth are fixed-price, agreed before any work begins. The fee depends on the scale and complexity of the project, whether conservation area or listed building constraints apply, and the scope of services required (planning only, building regulations, or combined). We provide a detailed fee proposal after a free initial consultation.
Start your project
Get a free quote for House Extension Plans in Wandsworth
Tell us about your project and we will respond within one working day with a fixed-fee proposal for House Extension Plans in Wandsworth.
Ready to talk through your project?
Start your House Extension Plans in Wandsworth project today
Get expert planning, design, and building regulation support from Crown Architecture. Fixed fees, fast response, and a track record of first-time planning approvals across Wandsworth.