Chippenham, Wiltshire
Bungalow rear extension in Chippenham
Single-storey rear extensions that keep everything on one level. If you live in Chippenham and want to know what a bungalow rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
We cover Chippenham (SN14 and SN15) as part of our Wiltshire work. For Chippenham bungalows we design the roof first, because the low eaves decide the height of the new room.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a bungalow rear extension cost in Chippenham?
For Chippenham we work from the South West England rate: £1,920–£3,120 per square metre of new floor, including VAT, standard specification. South West prices run slightly above our West Midlands baseline; natural stone to match the house is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £23,000–£37,500 |
| 4 m wide × 6 m deep (24 m²) | £46,000–£75,000 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a bungalow rear extension in Chippenham?
The planning route for a bungalow rear extension in Chippenham is set by England's householder rules and your council.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Chippenham like to extend?
Chippenham has Victorian terraces nearer the centre and post-war semis on the edges. Sloping gardens are frequent, which affects floor levels and steps down to the patio.
How a bungalow rear extension in Chippenham comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Bungalow rear extensions near Chippenham
We also build rear extensions for bungalows in nearby Corsham (3.1 miles) and Neston (4.6 miles).
- Bungalow rear extension in Corsham
- Bungalow rear extension in Neston
- Bungalow rear extension in Calne
- Bungalow rear extension in Melksham
- Bungalow rear extension in Devizes
Other work in Chippenham:
FAQ
Bungalow rear extension questions in Chippenham
How much does a bungalow rear extension cost in Chippenham?
As a guide, £1,920–£3,120 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £23,000–£37,500 at that rate. Your written price follows the survey.
Do you handle building control in Chippenham?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Will the roof look odd?
Not if the pitch and tiles match. Where the eaves are low, a flat-roofed section with a lantern is an alternative.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
What postcode areas do you cover around Chippenham?
Including SN14 and SN15, and the surrounding Wiltshire area.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.