Extensions in Egham: design, planning and build
Looking to extend your home in Egham? Start here: extension types, guide prices for Egham, the planning rules that apply and how a project runs.
- Postcode districtsGU25, TW18, TW20
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Egham extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Egham they are adjusted by ×1.12, the factor we use across South East England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
Egham and surrounding towns
Our survey diary covers Egham, including GU25, TW18, TW20. Nearby, we also take on projects in Staines-upon-Thames (2 miles), Ashford, Surrey (4 miles), Weybridge (6 miles), Sunbury-on-Thames (6 miles), Walton-on-Thames (7 miles). Just over the Berkshire border, Windsor is about 4 miles away.
Choosing the right extension in Egham
The South East has a broad mix of 1930s semis, post-war estates, newer developments and period cottages, and many houses have enough garden for a generous rear extension.
Start by comparing single-storey rear extensions, orangery extensions and double-storey extensions: between them they cover most of the layouts we see requested for houses like these.
Do extensions in Egham 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 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).
All extension types we build in Egham
- Kitchen extensions · from £30,000
- Extensions over a garage · from £26,500
- Home office extensions · from £17,500
- Conservatory replacement extensions · from £22,000
- Side extensions · from £24,500
- Bedroom extensions · from £29,000
- Annexe extensions · from £61,500
- Bungalow extensions · from £29,000
- Extension plans and drawings · from £1,300
- Side return extensions · from £20,000
- Timber frame extensions · from £23,500
- Glass box extensions · from £33,500
- Single-storey rear extensions · from £23,500
- Building regulations for extensions · from £1,000
- Wraparound extensions · from £40,000
- Orangery extensions · from £33,500
- Pitched roof extensions · from £24,500
- Flat roof extensions · from £23,500
- Double-storey extensions · from £42,500
- Planning permission for extensions · from £350
- Utility and boot room extensions · from £15,500
- Porch extensions · from £4,450
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
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
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Egham
How much does an extension cost in Egham?
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.
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.
Do I need planning permission for an extension in Egham?
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.
Do you cover all of Egham?
Yes, including the surrounding parts of Surrey. Site visits are free and there is no obligation.
Book a free site visit in Egham
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.