House extensions in Brockley
We design and build house extensions for homes in Brockley and the surrounding Greater London area, with guide prices adjusted for the region.
- Postcode districtsSE4, SE8, SE13, SE14, SE15, SE22
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Brockley and surrounding towns
Postcode districts we cover around Brockley include SE4, SE8, SE13, SE14, SE15, SE22. The same team covers New Cross (1 mile), Greenwich (1 mile), Catford (1 mile), Peckham (2 miles), Blackheath (2 miles), all within easy reach. Swanley, in Kent, is roughly 10 miles from Brockley and also on our list.
What works best for Brockley houses?
In London, space is at a premium and gardens are often short, so side returns, wraparounds and carefully planned rear extensions tend to make the most of every metre.
Start by comparing glass box extensions, side return extensions and kitchen extensions: between them they cover most of the layouts we see requested for houses like these.
Planning and building control in Brockley
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 extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
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).
Brockley extension prices at a glance
Every figure below is a guide for Brockley, adjusted for London build costs (×1.3) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
Choose an extension type
- Extension plans and drawings · from £1,550
- Planning permission for extensions · from £450
- Glass box extensions · from £39,000
- Conservatory replacement extensions · from £26,000
- Annexe extensions · from £71,500
- Porch extensions · from £5,200
- Side return extensions · from £23,000
- Single-storey rear extensions · from £27,000
- Flat roof extensions · from £27,000
- Building regulations for extensions · from £1,150
- Timber frame extensions · from £27,000
- Pitched roof extensions · from £28,500
- Kitchen extensions · from £35,000
- Side extensions · from £28,500
- Bungalow extensions · from £34,000
- Utility and boot room extensions · from £18,000
- Home office extensions · from £20,500
- Orangery extensions · from £39,000
- Double-storey extensions · from £49,000
- Extensions over a garage · from £31,000
- Wraparound extensions · from £46,500
- Bedroom extensions · from £33,500
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
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
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Brockley
How much does an extension cost in Brockley?
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.
How long does an extension take in Brockley?
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.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Brockley, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Brockley
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.