Two-storey extensions in Slough
Planning a bigger home in Slough? Compare extension types and guide prices below, then book a free site visit.
Slough at a glance
- Postcode districts
- SL1, SL2 and SL3
- Area
- Berkshire, England
- Price region
- South East England
- Nearest towns
- Windsor (1.8 miles), Burnham (3.5 miles), Maidenhead (5.4 miles), Gerrards Cross (5.6 miles)
- Distance to Reading
- about 16.6 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 Slough (SL1, SL2 and SL3) and the places around it, including Windsor (1.8 miles), Burnham (3.5 miles) and Maidenhead.
Extensions available in Slough
Two-storey rear extensions
Guide from £61,500 in Slough, including VAT.
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Two-storey side extensions
Our South East England guide starts at £94,500 for this type.
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Two-storey wraparound extensions
Design, approvals and build for Slough homes. Guide from £132,500.
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Part single, part two-storey extensions
Slough guide price from £79,000, Standard spec.
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Extensions over a garage
Our South East England guide starts at £34,500 for this type.
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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
For homes in Slough: typical guide from £61,500.
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Two-storey extensions for detached houses
From £94,500 in Slough. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Slough guide price from £61,500 (before kitchen units), Standard spec.
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Extra bedroom and en-suite extensions
Design, approvals and build for Slough homes. Guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Slough we measure distances to every boundary before suggesting a type.
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 Slough
Slough 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 Slough
Do you cover Slough?
Yes. We cover Slough (SL1, SL2 and SL3) and the surrounding area, including Windsor and Burnham. The first site visit is free.
What does a two-storey extension cost in Slough?
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 Slough do you cover?
Everywhere around it, including Windsor (1.8 miles), Burnham (3.5 miles) and Maidenhead (5.4 miles), and the rest of Berkshire.