Extending your home in Crowthorne
Looking to extend your home in Crowthorne? Start here: extension types, guide prices for Crowthorne, the planning rules that apply and how a project runs.
- Postcode districtsGU47, RG45
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Covering Crowthorne and nearby
Site visits are available across Crowthorne (GU47, RG45). Nearby, we also take on projects in Sandhurst (2 miles), Wokingham (3 miles), Bracknell (3 miles), Earley (7 miles), Reading (10 miles). Yateley, in Hampshire, is roughly 2 miles from Crowthorne and also on our list.
Crowthorne extension prices at a glance
Use these Crowthorne guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
Planning and building control in Crowthorne
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.
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.
Applications are decided by the local planning authority (your district, borough or unitary council).
Which extension suits a Crowthorne home?
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.
For many houses here, single-storey rear extensions, double-storey extensions or orangery extensions gives the most useful space for the budget.
Choose an extension type
- Orangery extensions · from £33,500
- Porch extensions · from £4,450
- Double-storey extensions · from £42,500
- Extension plans and drawings · from £1,300
- Utility and boot room extensions · from £15,500
- Side return extensions · from £20,000
- Home office extensions · from £17,500
- Kitchen extensions · from £30,000
- Bungalow extensions · from £29,000
- Conservatory replacement extensions · from £22,000
- Wraparound extensions · from £40,000
- Single-storey rear extensions · from £23,500
- Bedroom extensions · from £29,000
- Pitched roof extensions · from £24,500
- Flat roof extensions · from £23,500
- Glass box extensions · from £33,500
- Extensions over a garage · from £26,500
- Planning permission for extensions · from £350
- Annexe extensions · from £61,500
- Side extensions · from £24,500
- Timber frame extensions · from £23,500
- Building regulations for extensions · from £1,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
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
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Crowthorne
How much does an extension cost in Crowthorne?
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 Crowthorne?
Yes, including the surrounding parts of Berkshire. 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.
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 Crowthorne
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.