House extensions in Chippenham
Every type of house extension in Chippenham, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsSN15
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Chippenham
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.
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 Chippenham
We publish guide prices so you can budget before anyone visits. For Chippenham they are adjusted by ×1.02, the factor we use across South West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
| Kitchen extensions | 20 m² | £42,500 – £54,500 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
| Double-storey extensions | 32 m² | £58,500 – £77,000 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
Which extension suits a Chippenham 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.
The types we would usually look at first for a home in Chippenham are orangery extensions, single-storey rear extensions and pitched roof extensions, depending on the garden and how the house is laid out.
Covering Chippenham and nearby
Site visits are available across Chippenham (SN15). The same team covers Calne (6 miles), Melksham (6 miles), Trowbridge (10 miles), Devizes (10 miles), Swindon (16 miles), all within easy reach. For homes towards Somerset, Bath is around 12 miles away.
Extension types and starting prices
- Double-storey extensions · from £38,500
- Orangery extensions · from £30,500
- Flat roof extensions · from £21,000
- Utility and boot room extensions · from £14,000
- Timber frame extensions · from £21,000
- Kitchen extensions · from £27,500
- Glass box extensions · from £30,500
- Extension plans and drawings · from £1,200
- Bedroom extensions · from £26,500
- Pitched roof extensions · from £22,500
- Annexe extensions · from £56,000
- Bungalow extensions · from £26,500
- Building regulations for extensions · from £900
- Side return extensions · from £18,000
- Wraparound extensions · from £36,500
- Extensions over a garage · from £24,000
- Single-storey rear extensions · from £21,000
- Conservatory replacement extensions · from £20,000
- Side extensions · from £22,000
- Home office extensions · from £16,000
- Planning permission for extensions · from £350
- Porch extensions · from £4,050
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
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 Chippenham
How much does an extension cost in Chippenham?
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 Chippenham, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you cover all of Chippenham?
Yes, including the surrounding parts of Wiltshire. Site visits are free and there is no obligation.
Book a free site visit in Chippenham
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.