Extensions in Frome: design, planning and build
More space without moving: we plan and build extensions across Frome, with one team for the drawings, the council and the build.
- Postcode districtsBA11
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Which extension suits a Frome 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.
The types we would usually look at first for a home in Frome are pitched roof extensions, orangery extensions and single-storey rear extensions, depending on the garden and how the house is laid out.
What extensions cost in Frome
We publish guide prices so you can budget before anyone visits. For Frome they are adjusted by ×1.02, the factor we use across South West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £26,500 – £34,000 |
| 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 |
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
Planning and building control in Frome
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).
Covering Frome and nearby
Postcode districts we cover around Frome include BA11. Neighbouring towns we cover include Bath (10 miles), Keynsham (15 miles), Nailsea (24 miles), Yeovil (24 miles), Portishead (26 miles). For homes towards Wiltshire, Warminster is around 7 miles away.
Extension types and starting prices
- Glass box extensions · from £30,500
- Bungalow extensions · from £26,500
- Side extensions · from £22,000
- Annexe extensions · from £56,000
- Flat roof extensions · from £21,000
- Extensions over a garage · from £24,000
- Kitchen extensions · from £27,500
- Building regulations for extensions · from £900
- Planning permission for extensions · from £350
- Timber frame extensions · from £21,000
- Single-storey rear extensions · from £21,000
- Extension plans and drawings · from £1,200
- Pitched roof extensions · from £22,500
- Porch extensions · from £4,050
- Home office extensions · from £16,000
- Conservatory replacement extensions · from £20,000
- Side return extensions · from £18,000
- Bedroom extensions · from £26,500
- Utility and boot room extensions · from £14,000
- Wraparound extensions · from £36,500
- Double-storey extensions · from £38,500
- Orangery extensions · from £30,500
Free site visit
We visit your Frome home, measure up, talk through what you want and check the planning position.
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
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Frome
How much does an extension cost in Frome?
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.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Frome, and the guide-price tool gives a range for your own size and finish in about a minute.
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.
Book a free site visit in Frome
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.