Two-storey extensions in Maidenhead
Everything for a two-storey extension in Maidenhead, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Maidenhead at a glance
- Postcode districts
- SL6
- Area
- Berkshire, England
- Price region
- South East England
- Nearest towns
- Burnham (2.5 miles), Marlow (4 miles), Slough (5.4 miles), Windsor (5.8 miles)
- Distance to Reading
- about 11.7 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.
Around Maidenhead we also work in Burnham, Marlow and Slough, and across the rest of Berkshire. Postcode district in and near Maidenhead: SL6.
Extensions available in Maidenhead
Two-storey rear extensions
Design, approvals and build for Maidenhead homes. Guide from £61,500.
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Two-storey side extensions
Maidenhead guide price from £94,500, Standard spec.
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Two-storey wraparound extensions
Maidenhead guide price from £132,500, Standard spec.
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Part single, part two-storey extensions
For homes in Maidenhead: typical guide from £79,000.
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Extensions over a garage
From £34,500 in Maidenhead. Free visit to firm it up.
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First-floor extensions
Maidenhead guide price from £27,500, Standard spec.
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Two-storey extensions for semi-detached houses
Maidenhead guide price from £61,500, Standard spec.
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Two-storey extensions for detached houses
Our South East England guide starts at £94,500 for this type.
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Kitchen extensions with bedrooms above
Our South East England guide starts at £61,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
Maidenhead guide price from £61,500 (plus en-suite), Standard spec.
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 Maidenhead
Maidenhead 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 Maidenhead
Do you cover Maidenhead?
Yes. We cover Maidenhead (SL6) and the surrounding area, including Burnham and Marlow. The first site visit is free.
What does a two-storey extension cost in Maidenhead?
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 Maidenhead do you cover?
Everywhere around it, including Burnham (2.5 miles), Marlow (4 miles) and Slough (5.4 miles), and the rest of Berkshire.