Chalfont St Peter, Buckinghamshire
Bungalow rear extension in Chalfont St Peter
Single-storey rear extensions that keep everything on one level. We design, get the approvals for and build rear extensions for bungalows in Chalfont St Peter and the surrounding area, with one contract from the first survey to building control sign-off.
Chalfont St Peter sits in Buckinghamshire, with postcode districts including SL9. For bungalows in Buckinghamshire, a rear extension is the usual way to add space without adding stairs.
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 Chalfont St Peter?
A bungalow rear extension in Chalfont St Peter is priced at £2,070–£3,360 per square metre including VAT as a guide, before kitchen fit-out and fees. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £25,000–£40,500 |
| 4 m wide × 6 m deep (24 m²) | £49,500–£80,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a bungalow rear extension in Chalfont St Peter?
Here is how the rules in England apply to a bungalow rear extension in Chalfont St Peter.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres 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 Chalfont St Peter like to extend?
Commuter semis and detached houses make up much of Chalfont St Peter, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a bungalow rear extension in Chalfont St Peter 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Bungalow rear extensions near Chalfont St Peter
Neighbouring places we cover include Gerrards Cross (1.6 miles) and Chorleywood (3.6 miles).
- Bungalow rear extension in Gerrards Cross
- Bungalow rear extension in Chorleywood
- Bungalow rear extension in Beaconsfield
- Bungalow rear extension in Rickmansworth
- Bungalow rear extension in Batchworth
Other work in Chalfont St Peter:
FAQ
Bungalow rear extension questions in Chalfont St Peter
Is the site visit in Chalfont St Peter free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do I need planning permission for a rear extension in Chalfont St Peter?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Can I extend the loft as well?
Sometimes, but that is a different project; a rear extension keeps everything on one level.
Can you match the brick or stone on my Chalfont St Peter house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.