Home extensions in Somerset
More space without moving: we plan and build extensions across Somerset, with one team for the drawings, the council and the build.
- Towns listed11
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Postcode districts55
Towns we cover in Somerset
Towns we cover here include Bath, Weston-super-Mare, Taunton, Yeovil.
Which extension suits a Somerset home?
In the South West, local stone, render and brick vary from town to town, so matching materials is a big part of designing an extension that looks right.
For many houses here, orangery extensions, pitched roof extensions or annexe extensions gives the most useful space for the budget.
Do extensions in Somerset 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 extensions cost in Somerset
We publish guide prices so you can budget before anyone visits. For Somerset they are adjusted by ×1.02, the factor we use across South West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
| Double-storey extensions | 32 m² | £58,500 – £77,000 |
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Kitchen extensions | 20 m² | £42,500 – £54,500 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
Every extension type in Somerset
- Kitchen extensions · from £27,500
- Timber frame extensions · from £21,000
- Side extensions · from £22,000
- Building regulations for extensions · from £900
- Side return extensions · from £18,000
- Conservatory replacement extensions · from £20,000
- Single-storey rear extensions · from £21,000
- Bedroom extensions · from £26,500
- Pitched roof extensions · from £22,500
- Double-storey extensions · from £38,500
- Flat roof extensions · from £21,000
- Annexe extensions · from £56,000
- Planning permission for extensions · from £350
- Orangery extensions · from £30,500
- Utility and boot room extensions · from £14,000
- Home office extensions · from £16,000
- Bungalow extensions · from £26,500
- Porch extensions · from £4,050
- Extension plans and drawings · from £1,200
- Extensions over a garage · from £24,000
- Glass box extensions · from £30,500
- Wraparound extensions · from £36,500
Neighbouring areas
Questions about extensions in Somerset
How much does an extension cost in Somerset?
With our South West England factor (×1.02), a standard-spec 20 m² single-storey extension is a guide £41,500 to £53,500 including VAT. Prices for every type are linked on this page.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Do I need planning permission for an extension in Somerset?
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 Somerset, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Somerset
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.