Two-storey extensions in East Grinstead
We design, get approval for and build two-storey extensions in East Grinstead and the surrounding area. Choose the type of extension below or book a free site visit.
East Grinstead at a glance
- Postcode districts
- RH19
- Area
- West Sussex, England
- Price region
- South East England
- Nearest towns
- Horley (7.5 miles), Crawley (7.7 miles), Crowborough (8.5 miles), Broadfield (8.9 miles)
- Distance to Crawley
- about 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.
Around East Grinstead we also work in Horley, Crawley and Crowborough, and across the rest of West Sussex. Postcode district in and near East Grinstead: RH19.
Extensions available in East Grinstead
Two-storey rear extensions
Guide from £61,500 in East Grinstead, including VAT.
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Two-storey side extensions
Design, approvals and build for East Grinstead homes. Guide from £94,500.
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Two-storey wraparound extensions
From £132,500 in East Grinstead. Free visit to firm it up.
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Part single, part two-storey extensions
East Grinstead 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
For homes in East Grinstead: typical guide from £27,500.
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Two-storey extensions for semi-detached houses
Guide from £61,500 in East Grinstead, including VAT.
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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
Design, approvals and build for East Grinstead homes. Guide from £61,500 (before kitchen units).
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Extra bedroom and en-suite extensions
From £61,500 (plus en-suite) in East Grinstead. Free visit to firm it up.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in West Sussex, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 East Grinstead
East Grinstead 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 East Grinstead
Do you cover East Grinstead?
Yes. We cover East Grinstead (RH19) and the surrounding area, including Horley and Crawley. The first site visit is free.
What does a two-storey extension cost in East Grinstead?
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 East Grinstead do you cover?
Everywhere around it, including Horley (7.5 miles), Crawley (7.7 miles) and Crowborough (8.5 miles), and the rest of West Sussex.