Extending your home in Devizes
We design and build house extensions for homes in Devizes and the surrounding Wiltshire area, with guide prices adjusted for the region.
- Postcode districtsSN10
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
What works best for Devizes houses?
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.
Depending on the plot, pitched roof extensions and single-storey rear extensions are often the strongest options, with annexe extensions worth considering where there is room.
Areas we cover around Devizes
Site visits are available across Devizes (SN10). Nearby, we also take on projects in Melksham (7 miles), Calne (7 miles), Trowbridge (10 miles), Chippenham (10 miles), Warminster (14 miles). For homes towards Somerset, Frome is around 16 miles away.
Planning and building control in Devizes
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 return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
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.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Applications are decided by the local planning authority (your district, borough or unitary council).
Popular extension prices in Devizes
Every figure below is a guide for Devizes, 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) |
|---|---|---|
| Kitchen extensions | 20 m² | £42,500 – £54,500 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Side return extensions | 11 m² | £26,500 – £34,000 |
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
Extension types and starting prices
- Side return extensions · from £18,000
- Conservatory replacement extensions · from £20,000
- Extension plans and drawings · from £1,200
- Kitchen extensions · from £27,500
- Planning permission for extensions · from £350
- Single-storey rear extensions · from £21,000
- Utility and boot room extensions · from £14,000
- Building regulations for extensions · from £900
- Side extensions · from £22,000
- Annexe extensions · from £56,000
- Flat roof extensions · from £21,000
- Bedroom extensions · from £26,500
- Glass box extensions · from £30,500
- Orangery extensions · from £30,500
- Extensions over a garage · from £24,000
- Timber frame extensions · from £21,000
- Bungalow extensions · from £26,500
- Porch extensions · from £4,050
- Pitched roof extensions · from £22,500
- Double-storey extensions · from £38,500
- Home office extensions · from £16,000
- Wraparound extensions · from £36,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
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
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Devizes
How much does an extension cost in Devizes?
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 I need planning permission for an extension in Devizes?
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.
How long does an extension take in Devizes?
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 you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Devizes
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.