Surrey house extensions
From a small utility to a two-storey addition, we take on house extensions throughout Surrey, starting with a free visit and a planning check.
- Towns listed22
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Postcode districts58
Towns we cover in Surrey
Towns we cover here include Woking, Guildford, Esher, Redhill.
Surrey extension prices at a glance
Prices on this page use our South East England factor of ×1.12, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
Planning and building control in Surrey
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 Surrey 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.
Depending on the plot, wraparound extensions and single-storey rear extensions are often the strongest options, with double-storey extensions worth considering where there is room.
Choose an extension type
- Building regulations for extensions · from £1,000
- Extension plans and drawings · from £1,300
- Bungalow extensions · from £29,000
- Glass box extensions · from £33,500
- Annexe extensions · from £61,500
- Planning permission for extensions · from £350
- Kitchen extensions · from £30,000
- Utility and boot room extensions · from £15,500
- Bedroom extensions · from £29,000
- Single-storey rear extensions · from £23,500
- Porch extensions · from £4,450
- Double-storey extensions · from £42,500
- Timber frame extensions · from £23,500
- Conservatory replacement extensions · from £22,000
- Home office extensions · from £17,500
- Wraparound extensions · from £40,000
- Side return extensions · from £20,000
- Orangery extensions · from £33,500
- Extensions over a garage · from £26,500
- Pitched roof extensions · from £24,500
- Side extensions · from £24,500
- Flat roof extensions · from £23,500
Neighbouring areas
Questions about extensions in Surrey
How much does an extension cost in Surrey?
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.
How long does an extension take in Surrey?
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 I need planning permission for an extension in Surrey?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Surrey, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Surrey
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.