Two-storey extensions in Crawley
Planning a bigger home in Crawley? Compare extension types and guide prices below, then book a free site visit.
Crawley at a glance
- Postcode districts
- RH10
- Area
- West Sussex, England
- Price region
- South East England
- Nearest towns
- Broadfield (1.5 miles), Horley (4.4 miles), Horsham (7.2 miles), East Grinstead (7.7 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.
We cover Crawley (RH10) and the places around it, including Broadfield (1.5 miles), Horley (4.4 miles) and Horsham.
Extensions available in Crawley
Two-storey rear extensions
Design, approvals and build for Crawley homes. Guide from £61,500.
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Two-storey side extensions
From £94,500 in Crawley. Free visit to firm it up.
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Two-storey wraparound extensions
Design, approvals and build for Crawley homes. Guide from £132,500.
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Part single, part two-storey extensions
From £79,000 in Crawley. Free visit to firm it up.
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Extensions over a garage
Guide from £34,500 in Crawley, including VAT.
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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
Design, approvals and build for Crawley homes. Guide from £61,500.
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Two-storey extensions for detached houses
Design, approvals and build for Crawley homes. Guide from £94,500.
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Kitchen extensions with bedrooms above
Crawley 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 Crawley homes. Guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Crawley, with a rough idea of the approval route and cost for each.
Also available in West Sussex
- 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 Crawley
Crawley 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 Crawley
Do you cover Crawley?
Yes. We cover Crawley (RH10) and the surrounding area, including Broadfield and Horley. The first site visit is free.
What does a two-storey extension cost in Crawley?
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 Crawley do you cover?
Everywhere around it, including Broadfield (1.5 miles), Horley (4.4 miles) and Horsham (7.2 miles), and the rest of West Sussex.