Two-storey extensions in Steyning
Everything for a two-storey extension in Steyning, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Steyning at a glance
- Postcode districts
- BN5, BN44 and RH20
- Area
- West Sussex, England
- Price region
- South East England
- Nearest towns
- Lancing (4.1 miles), Shoreham-by-Sea (4.4 miles), Worthing (5.2 miles), Portslade (5.8 miles)
- Distance to Crawley
- about 16.8 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.
Steyning sits about 16.8 miles from Crawley. Closer to home, Lancing is 4.1 miles away and Shoreham-by-Sea 4.4 miles.
Extensions available in Steyning
Two-storey rear extensions
From £61,500 in Steyning. Free visit to firm it up.
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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
Steyning guide price from £132,500, Standard spec.
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Part single, part two-storey extensions
Guide from £79,000 in Steyning, including VAT.
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Extensions over a garage
Guide from £34,500 in Steyning, 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
Our South East England guide starts at £61,500 for this type.
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Two-storey extensions for detached houses
Guide from £94,500 in Steyning, including VAT.
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Kitchen extensions with bedrooms above
Steyning 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 Steyning 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 Steyning, 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 Steyning
Steyning 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 Steyning
Do you cover Steyning?
Yes. We cover Steyning (BN5, BN44 and RH20) and the surrounding area, including Lancing and Shoreham-by-Sea. The first site visit is free.
What does a two-storey extension cost in Steyning?
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 Steyning do you cover?
Everywhere around it, including Lancing (4.1 miles), Shoreham-by-Sea (4.4 miles) and Worthing (5.2 miles), and the rest of West Sussex.