Extending your home in Berkshire
Every type of house extension in Berkshire, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Towns listed11
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Postcode districts26
Towns we cover in Berkshire
Towns we cover here include Reading, Slough, Bracknell, Maidenhead.
Do extensions in Berkshire 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 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.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
What works best for Berkshire houses?
Homes across the South East range from Victorian terraces in the older town centres to large detached houses on the edges, so the right extension type varies street by street.
For many houses here, double-storey extensions, wraparound extensions or single-storey rear extensions gives the most useful space for the budget.
Popular extension prices in Berkshire
Every figure below is a guide for Berkshire, 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) |
|---|---|---|
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
All extension types we build in Berkshire
- Utility and boot room extensions · from £15,500
- Timber frame extensions · from £23,500
- Side return extensions · from £20,000
- Single-storey rear extensions · from £23,500
- Porch extensions · from £4,450
- Extension plans and drawings · from £1,300
- Glass box extensions · from £33,500
- Home office extensions · from £17,500
- Side extensions · from £24,500
- Extensions over a garage · from £26,500
- Bungalow extensions · from £29,000
- Conservatory replacement extensions · from £22,000
- Bedroom extensions · from £29,000
- Pitched roof extensions · from £24,500
- Flat roof extensions · from £23,500
- Wraparound extensions · from £40,000
- Kitchen extensions · from £30,000
- Planning permission for extensions · from £350
- Double-storey extensions · from £42,500
- Building regulations for extensions · from £1,000
- Annexe extensions · from £61,500
- Orangery extensions · from £33,500
Neighbouring areas
Questions about extensions in Berkshire
How much does an extension cost in Berkshire?
With our South East England factor (×1.12), a standard-spec 20 m² single-storey extension is a guide £45,500 to £58,500 including VAT. Prices for every type are linked on this page.
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 you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do I need planning permission for an extension in Berkshire?
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.
Book a free site visit in Berkshire
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.