Extensions in Nailsea: design, planning and build
More space without moving: we plan and build extensions across Nailsea, with one team for the drawings, the council and the build.
- Postcode districtsBS48
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Areas we cover around Nailsea
Postcode districts we cover around Nailsea include BS48. The same team covers Portishead (3 miles), Clevedon (4 miles), Weston-super-Mare (11 miles), Keynsham (11 miles), Burnham-on-Sea (17 miles), all within easy reach. For homes towards Gloucestershire, Kingswood is around 11 miles away.
What extensions cost in Nailsea
Prices on this page use our South West England factor of ×1.02, 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) |
|---|---|---|
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
| Double-storey extensions | 32 m² | £58,500 – £77,000 |
What works best for Nailsea houses?
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.
The types we would usually look at first for a home in Nailsea are annexe extensions, pitched roof extensions and single-storey rear extensions, depending on the garden and how the house is laid out.
Planning rules in Nailsea
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).
All extension types we build in Nailsea
- Side extensions · from £22,000
- Bungalow extensions · from £26,500
- Orangery extensions · from £30,500
- Utility and boot room extensions · from £14,000
- Pitched roof extensions · from £22,500
- Porch extensions · from £4,050
- Flat roof extensions · from £21,000
- Bedroom extensions · from £26,500
- Side return extensions · from £18,000
- Kitchen extensions · from £27,500
- Building regulations for extensions · from £900
- Planning permission for extensions · from £350
- Single-storey rear extensions · from £21,000
- Extension plans and drawings · from £1,200
- Double-storey extensions · from £38,500
- Home office extensions · from £16,000
- Extensions over a garage · from £24,000
- Timber frame extensions · from £21,000
- Conservatory replacement extensions · from £20,000
- Annexe extensions · from £56,000
- Glass box extensions · from £30,500
- Wraparound extensions · from £36,500
Free site visit
We visit your Nailsea home, measure up, talk through what you want and check the planning position.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Nailsea
How much does an extension cost in Nailsea?
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.
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 Nailsea?
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.
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.
How long does an extension take in Nailsea?
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 Nailsea
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.