Extending your home in Sutton
Every type of house extension in Sutton, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsKT4, SM1, SM2, SM3, SM5, SM6
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
What works best for Sutton houses?
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, side return extensions and glass box extensions are often the strongest options, with wraparound extensions worth considering where there is room.
Planning and building control in Sutton
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).
Popular extension prices in Sutton
We publish guide prices so you can budget before anyone visits. For Sutton they are adjusted by ×1.3, the factor we use across London.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
Covering Sutton and nearby
Across KT4, SM1, SM2, SM3, SM5, SM6, we can visit, measure and advise. We also work in nearby Carshalton (2 miles), Wallington (2 miles), Worcester Park (3 miles), Coulsdon (3 miles), Morden (3 miles). Just over the Surrey border, Banstead is about 2 miles away.
Extension types and starting prices
- Building regulations for extensions · from £1,150
- Bungalow extensions · from £34,000
- Kitchen extensions · from £35,000
- Bedroom extensions · from £33,500
- Planning permission for extensions · from £450
- Orangery extensions · from £39,000
- Home office extensions · from £20,500
- Flat roof extensions · from £27,000
- Extensions over a garage · from £31,000
- Extension plans and drawings · from £1,550
- Timber frame extensions · from £27,000
- Glass box extensions · from £39,000
- Single-storey rear extensions · from £27,000
- Wraparound extensions · from £46,500
- Porch extensions · from £5,200
- Side extensions · from £28,500
- Pitched roof extensions · from £28,500
- Utility and boot room extensions · from £18,000
- Conservatory replacement extensions · from £26,000
- Side return extensions · from £23,000
- Annexe extensions · from £71,500
- Double-storey extensions · from £49,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
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
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Sutton
How much does an extension cost in Sutton?
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.
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.
How long does an extension take in Sutton?
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.
Do you cover all of Sutton?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Sutton
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.