Chalfont St Peter, Buckinghamshire
Kitchen-diner rear extension in Chalfont St Peter
We plan and build kitchen-diner rear extensions for homeowners in Chalfont St Peter. An open-plan kitchen, dining and family room that opens straight onto the garden. Start with a free site visit, then a written price once the design is agreed.
Chalfont St Peter sits in Buckinghamshire, with postcode districts including SL9. A kitchen-diner is often the reason people in Chalfont St Peter extend: the back kitchen in inter-war semis and 1960s estates is rarely big enough for a table.
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 kitchen-diner rear extension cost in Chalfont St Peter?
In Chalfont St Peter, our guide for a kitchen-diner rear extension is £2,130–£3,470 per square metre including VAT for a standard specification. 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) | £25,500–£41,500 |
| 4 m wide × 5 m deep (20 m²) | £42,500–£69,500 |
| 4 m wide × 6 m deep (24 m²) | £51,000–£83,500 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a kitchen-diner rear extension in Chalfont St Peter?
Here is how the rules in England apply to a kitchen-diner 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?
Around Chalfont St Peter the housing ranges from inter-war semis to 1960s and 1970s estates with good-sized gardens. Many of the newer estates had permitted development rights removed by condition, so we check the planning history before anything is drawn.
How a kitchen-diner rear extension in Chalfont St Peter comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Kitchen-diner rear extensions near Chalfont St Peter
Close by, we work in Gerrards Cross, about 1.6 miles away, and Chorleywood, about 3.6 miles away.
- Kitchen-diner rear extension in Gerrards Cross
- Kitchen-diner rear extension in Chorleywood
- Kitchen-diner rear extension in Beaconsfield
- Kitchen-diner rear extension in Rickmansworth
- Kitchen-diner rear extension in Batchworth
Other work in Chalfont St Peter:
FAQ
Kitchen-diner rear extension questions in Chalfont St Peter
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.
How much does a kitchen-diner rear extension cost in Chalfont St Peter?
As a guide, £2,130–£3,470 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £25,500–£41,500 at that rate. Your written price follows the survey.
Where does the cooker extraction go?
Through the new wall or roof, ducted to outside. Recirculating hoods are possible but less effective.
What postcode areas do you cover around Chalfont St Peter?
Including SL9, and the surrounding Buckinghamshire area.
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.
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.