Two-storey extensions in Gerrards Cross
Planning a bigger home in Gerrards Cross? Compare extension types and guide prices below, then book a free site visit.
Gerrards Cross at a glance
- Postcode districts
- SL9
- Area
- Buckinghamshire, England
- Price region
- South East England
- Nearest towns
- Chalfont Saint Peter (1.6 miles), Uxbridge (4.1 miles), Beaconsfield (4.3 miles), Rickmansworth (5 miles)
- Distance to Milton Keynes
- about 32.6 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.
Around Gerrards Cross we also work in Chalfont Saint Peter, Uxbridge and Beaconsfield, and across the rest of Buckinghamshire. Postcode district in and near Gerrards Cross: SL9.
Extensions available in Gerrards Cross
Two-storey rear extensions
Guide from £61,500 in Gerrards Cross, including VAT.
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Two-storey side extensions
Guide from £94,500 in Gerrards Cross, including VAT.
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Two-storey wraparound extensions
Gerrards Cross guide price from £132,500, Standard spec.
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Part single, part two-storey extensions
From £79,000 in Gerrards Cross. Free visit to firm it up.
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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
Gerrards Cross guide price from £27,500, Standard spec.
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Two-storey extensions for semi-detached houses
For homes in Gerrards Cross: typical guide from £61,500.
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Two-storey extensions for detached houses
Gerrards Cross guide price from £94,500, Standard spec.
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Kitchen extensions with bedrooms above
Gerrards Cross 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 Gerrards Cross homes. Guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Gerrards Cross we also design annexes, home offices and bedrooms over garages.
Also available in Buckinghamshire
- 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 Gerrards Cross
Gerrards Cross 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 Gerrards Cross
Do you cover Gerrards Cross?
Yes. We cover Gerrards Cross (SL9) and the surrounding area, including Chalfont Saint Peter and Uxbridge. The first site visit is free.
What does a two-storey extension cost in Gerrards Cross?
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 Gerrards Cross do you cover?
Everywhere around it, including Chalfont Saint Peter (1.6 miles), Uxbridge (4.1 miles) and Beaconsfield (4.3 miles), and the rest of Buckinghamshire.