Brixton house extensions
More space without moving: we plan and build extensions across Brixton, with one team for the drawings, the council and the build.
- Postcode districtsSE5, SE24, SW2, SW4, SW8, SW9
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Planning and building control in Brixton
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
In England a single-storey side return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Applications are decided by the local planning authority (your district, borough or unitary council).
Brixton extension prices at a glance
Prices on this page use our London factor of ×1.3, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
Which extension suits a Brixton home?
Across London, terraced houses with narrow side returns and tight access are the norm, which shapes everything from party wall notices to how materials reach the back garden.
Depending on the plot, kitchen extensions and wraparound extensions are often the strongest options, with side return extensions worth considering where there is room.
Covering Brixton and nearby
Across SE5, SE24, SW2, SW4, SW8, SW9, we can visit, measure and advise. Neighbouring towns we cover include Peckham (2 miles), Battersea (2 miles), Streatham (3 miles), New Cross (3 miles), Brockley (3 miles). Ewell, in Surrey, is roughly 10 miles from Brixton and also on our list.
Choose an extension type
- Porch extensions · from £5,200
- Side extensions · from £28,500
- Flat roof extensions · from £27,000
- Utility and boot room extensions · from £18,000
- Pitched roof extensions · from £28,500
- Kitchen extensions · from £35,000
- Single-storey rear extensions · from £27,000
- Glass box extensions · from £39,000
- Bungalow extensions · from £34,000
- Extensions over a garage · from £31,000
- Home office extensions · from £20,500
- Conservatory replacement extensions · from £26,000
- Side return extensions · from £23,000
- Wraparound extensions · from £46,500
- Planning permission for extensions · from £450
- Bedroom extensions · from £33,500
- Double-storey extensions · from £49,000
- Extension plans and drawings · from £1,550
- Annexe extensions · from £71,500
- Timber frame extensions · from £27,000
- Orangery extensions · from £39,000
- Building regulations for extensions · from £1,150
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Brixton
How much does an extension cost in Brixton?
Using our London factor (×1.3), a standard-spec single-storey extension of 20 m² is a guide £53,000 to £68,000 including VAT, and a 32 m² two-storey extension £74,500 to £98,000. Your written price follows the survey.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Brixton, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do I need planning permission for an extension in Brixton?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
How long does an extension take in Brixton?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
Book a free site visit in Brixton
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.