Extending your home in Burnham-on-Sea
Planning an extension in Burnham-on-Sea? Compare extension types, see guide prices adjusted for Burnham-on-Sea and book a free site visit.
- Postcode districtsTA8, TA9
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
What extensions cost in Burnham-on-Sea
Every figure below is a guide for Burnham-on-Sea, adjusted for South West England build costs (×1.02) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
| Side return extensions | 11 m² | £26,500 – £34,000 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
Planning rules in Burnham-on-Sea
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 two-storey rear extension is permitted development only if it projects no more than 3 m from the original rear wall, sits at least 7 m from the rear boundary, matches the roof pitch and uses obscure, non-opening side windows upstairs. Most two-storey extensions therefore go through a householder planning application, which costs £548 from 1 April 2026 and normally takes about 8 weeks.
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 Burnham-on-Sea home?
South West homes range from terraced streets in the cities to stone cottages and bungalows in the countryside, and conservation areas are common in historic centres.
For many houses here, single-storey rear extensions, orangery extensions or annexe extensions gives the most useful space for the budget.
Where we work near Burnham-on-Sea
We cover Burnham-on-Sea and the postcode districts TA8, TA9. The same team covers Weston-super-Mare (7 miles), Bridgwater (8 miles), Clevedon (15 miles), Taunton (16 miles), Nailsea (17 miles), all within easy reach. For homes towards Gloucestershire, Kingswood is around 26 miles away.
All extension types we build in Burnham-on-Sea
- Planning permission for extensions · from £350
- Orangery extensions · from £30,500
- Single-storey rear extensions · from £21,000
- Annexe extensions · from £56,000
- Kitchen extensions · from £27,500
- Timber frame extensions · from £21,000
- Wraparound extensions · from £36,500
- Porch extensions · from £4,050
- Flat roof extensions · from £21,000
- Conservatory replacement extensions · from £20,000
- Bungalow extensions · from £26,500
- Extensions over a garage · from £24,000
- Glass box extensions · from £30,500
- Bedroom extensions · from £26,500
- Side return extensions · from £18,000
- Pitched roof extensions · from £22,500
- Side extensions · from £22,000
- Double-storey extensions · from £38,500
- Home office extensions · from £16,000
- Utility and boot room extensions · from £14,000
- Building regulations for extensions · from £900
- Extension plans and drawings · from £1,200
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
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
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Burnham-on-Sea
How much does an extension cost in Burnham-on-Sea?
Using our South West England factor (×1.02), a standard-spec single-storey extension of 20 m² is a guide £41,500 to £53,500 including VAT, and a 32 m² two-storey extension £58,500 to £77,000. 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 you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Burnham-on-Sea, and the guide-price tool gives a range for your own size and finish in about a minute.
How long does an extension take in Burnham-on-Sea?
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.
Book a free site visit in Burnham-on-Sea
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.