Extensions in Surbiton: design, planning and build
Looking to extend your home in Surbiton? Start here: extension types, guide prices for Surbiton, the planning rules that apply and how a project runs.
- Postcode districtsKT1, KT2, KT3, KT5, KT6, KT9
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Do extensions in Surbiton need planning permission?
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).
Areas we cover around Surbiton
Postcode districts we cover around Surbiton include KT1, KT2, KT3, KT5, KT6, KT9. We also work in nearby Hook (2 miles), New Malden (2 miles), Chessington (2 miles), Worcester Park (2 miles), Hampton (3 miles). For homes towards Surrey, East Molesey is around 2 miles away.
Surbiton 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 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
Which extension suits a Surbiton 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.
For many houses here, side return extensions, glass box extensions or wraparound extensions gives the most useful space for the budget.
Every extension type in Surbiton
- Building regulations for extensions · from £1,150
- Double-storey extensions · from £49,000
- Bedroom extensions · from £33,500
- Single-storey rear extensions · from £27,000
- Extension plans and drawings · from £1,550
- Planning permission for extensions · from £450
- Annexe extensions · from £71,500
- Home office extensions · from £20,500
- Conservatory replacement extensions · from £26,000
- Bungalow extensions · from £34,000
- Pitched roof extensions · from £28,500
- Porch extensions · from £5,200
- Glass box extensions · from £39,000
- Wraparound extensions · from £46,500
- Side extensions · from £28,500
- Utility and boot room extensions · from £18,000
- Kitchen extensions · from £35,000
- Orangery extensions · from £39,000
- Side return extensions · from £23,000
- Extensions over a garage · from £31,000
- Timber frame extensions · from £27,000
- Flat roof extensions · from £27,000
Free site visit
We visit your Surbiton home, measure up, talk through what you want and check the planning position.
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
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
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 Surbiton
How much does an extension cost in Surbiton?
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 Surbiton, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you cover all of Surbiton?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Book a free site visit in Surbiton
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.