Two-storey extensions in Burnham
Everything for a two-storey extension in Burnham, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Burnham at a glance
- Postcode districts
- SL1
- Area
- Berkshire, England
- Price region
- South East England
- Nearest towns
- Maidenhead (2.5 miles), Slough (3.5 miles), Windsor (4.6 miles), Marlow (5.2 miles)
- Distance to Reading
- about 14.2 miles
- Approvals
- Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission.
We cover Burnham (SL1) and the places around it, including Maidenhead (2.5 miles), Slough (3.5 miles) and Windsor.
Extensions available in Burnham
Two-storey rear extensions
From £61,500 in Burnham. Free visit to firm it up.
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Two-storey side extensions
Burnham guide price from £94,500, Standard spec.
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Two-storey wraparound extensions
Our South East England guide starts at £132,500 for this type.
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Part single, part two-storey extensions
Burnham guide price from £79,000, Standard spec.
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Extensions over a garage
For homes in Burnham: typical guide from £34,500.
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First-floor extensions
Our South East England guide starts at £27,500 for this type.
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Two-storey extensions for semi-detached houses
From £61,500 in Burnham. Free visit to firm it up.
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Two-storey extensions for detached houses
Burnham guide price from £94,500, Standard spec.
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Kitchen extensions with bedrooms above
For homes in Burnham: typical guide from £61,500 (before kitchen units).
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Extra bedroom and en-suite extensions
For homes in Burnham: typical guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Berkshire, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in Berkshire
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Party wall notices for extensions
- Design and build two-storey extensions
Rules for Burnham
Burnham is in England. Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission. Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
The full England rules explained
Questions about extensions in Burnham
Do you cover Burnham?
Yes. We cover Burnham (SL1) and the surrounding area, including Maidenhead and Slough. The first site visit is free.
What does a two-storey extension cost in Burnham?
Using our South East England guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £61,500–£83,000 including VAT. An extension over a garage is about £34,500–£50,500.
Which other places near Burnham do you cover?
Everywhere around it, including Maidenhead (2.5 miles), Slough (3.5 miles) and Windsor (4.6 miles), and the rest of Berkshire.