Cheltenham house extensions
More space without moving: we plan and build extensions across Cheltenham, with one team for the drawings, the council and the build.
- Postcode districtsGL3, GL50, GL51, GL52, GL53
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Cheltenham
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.
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).
Which extension suits a Cheltenham 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.
Start by comparing annexe extensions, single-storey rear extensions and pitched roof extensions: between them they cover most of the layouts we see requested for houses like these.
Areas we cover around Cheltenham
We cover Cheltenham and the postcode districts GL3, GL50, GL51, GL52, GL53. The same team covers Tewkesbury (7 miles), Gloucester (7 miles), Stroud (12 miles), Cirencester (13 miles), Dursley (19 miles), all within easy reach. For homes towards Worcestershire, Evesham is around 14 miles away.
What extensions cost in Cheltenham
Use these Cheltenham guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Double-storey extensions | 32 m² | £58,500 – £77,000 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
| Kitchen extensions | 20 m² | £42,500 – £54,500 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
| Side return extensions | 11 m² | £26,500 – £34,000 |
Extension types and starting prices
- Pitched roof extensions · from £22,500
- Bedroom extensions · from £26,500
- Planning permission for extensions · from £350
- Utility and boot room extensions · from £14,000
- Single-storey rear extensions · from £21,000
- Kitchen extensions · from £27,500
- Home office extensions · from £16,000
- Porch extensions · from £4,050
- Side extensions · from £22,000
- Extension plans and drawings · from £1,200
- Wraparound extensions · from £36,500
- Double-storey extensions · from £38,500
- Extensions over a garage · from £24,000
- Bungalow extensions · from £26,500
- Orangery extensions · from £30,500
- Annexe extensions · from £56,000
- Building regulations for extensions · from £900
- Flat roof extensions · from £21,000
- Timber frame extensions · from £21,000
- Conservatory replacement extensions · from £20,000
- Glass box extensions · from £30,500
- Side return extensions · from £18,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
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
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Cheltenham
How much does an extension cost in Cheltenham?
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.
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.
Do I need planning permission for an extension in Cheltenham?
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.
Do you cover all of Cheltenham?
Yes, including the surrounding parts of Gloucestershire. Site visits are free and there is no obligation.
Book a free site visit in Cheltenham
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.