Burnham, Berkshire
Semi-detached rear extension in Burnham
Single or two-storey extensions for semi-detached houses, with side access and one party wall. We design, get the approvals for and build rear extensions for semi-detached houses in Burnham and the surrounding area, with one contract from the first survey to building control sign-off.
Burnham is covered from our Berkshire round, including SL1 and SL2. In Burnham we measure the attached neighbour's extension at the survey, because it often sets the sensible depth for yours.
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 semi-detached rear extension cost in Burnham?
A semi-detached rear extension in Burnham is priced at £2,130–£3,470 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) | £25,500–£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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a semi-detached rear extension in Burnham?
Whether your semi-detached rear extension in Burnham needs a planning application depends on its size, your house and any local restrictions.
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's rules allow a rear extension of more than one storey without an application only when it is no deeper than 3 metres and at least 7 metres from the boundary opposite the rear wall, and never on designated land. Most two-storey schemes need householder planning permission.
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 Burnham like to extend?
Commuter semis and detached houses make up much of Burnham, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a semi-detached rear extension in Burnham 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.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
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.
Semi-detached rear extensions near Burnham
Neighbouring places we cover include Maidenhead (2.5 miles) and Slough (3.5 miles).
- Semi-detached rear extension in Maidenhead
- Semi-detached rear extension in Slough
- Semi-detached rear extension in Windsor
- Semi-detached rear extension in Marlow
- Semi-detached rear extension in Beaconsfield
Other work in Burnham:
FAQ
Semi-detached rear extension questions in Burnham
What postcode areas do you cover around Burnham?
Including SL1 and SL2, and the surrounding Berkshire area.
How long does a rear extension take to build in Burnham?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Can I match pebbledash or render?
Yes. Many semis are refinished with new render across the whole back elevation so old and new match.
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.
Is the site visit in Burnham free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can you match the brick or stone on my Burnham house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.