Home extensions in Walton-on-Thames
More space without moving: we plan and build extensions across Walton-on-Thames, with one team for the drawings, the council and the build.
- Postcode districtsKT12, KT13, TW16, TW17
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
What works best for Walton-on-Thames houses?
In the South East, plenty of houses have already been extended once, which makes checking the remaining permitted development allowance an important early step.
Start by comparing double-storey extensions, single-storey rear extensions and wraparound extensions: between them they cover most of the layouts we see requested for houses like these.
Approvals for an extension in Walton-on-Thames
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).
Walton-on-Thames extension prices at a glance
Every figure below is a guide for Walton-on-Thames, adjusted for South East England build costs (×1.12) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
Walton-on-Thames and surrounding towns
We cover Walton-on-Thames and the postcode districts KT12, KT13, TW16, TW17. The same team covers Sunbury-on-Thames (1 mile), West Molesey (2 miles), Weybridge (2 miles), Esher (2 miles), East Molesey (3 miles), all within easy reach. For homes towards Greater London, Hampton is around 3 miles away.
Extension types and starting prices
- Annexe extensions · from £61,500
- Conservatory replacement extensions · from £22,000
- Pitched roof extensions · from £24,500
- Flat roof extensions · from £23,500
- Wraparound extensions · from £40,000
- Bedroom extensions · from £29,000
- Bungalow extensions · from £29,000
- Building regulations for extensions · from £1,000
- Side extensions · from £24,500
- Home office extensions · from £17,500
- Orangery extensions · from £33,500
- Side return extensions · from £20,000
- Kitchen extensions · from £30,000
- Double-storey extensions · from £42,500
- Extensions over a garage · from £26,500
- Porch extensions · from £4,450
- Timber frame extensions · from £23,500
- Planning permission for extensions · from £350
- Utility and boot room extensions · from £15,500
- Single-storey rear extensions · from £23,500
- Glass box extensions · from £33,500
- Extension plans and drawings · from £1,300
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
With the design and specification agreed, you get a fixed written price and a start date.
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 Walton-on-Thames
How much does an extension cost in Walton-on-Thames?
Using our South East England factor (×1.12), a standard-spec single-storey extension of 20 m² is a guide £45,500 to £58,500 including VAT, and a 32 m² two-storey extension £64,500 to £84,500. Your written price follows the survey.
Do you cover all of Walton-on-Thames?
Yes, including the surrounding parts of Surrey. 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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Walton-on-Thames, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Walton-on-Thames
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.