Two-storey extensions in Selsey
Everything for a two-storey extension in Selsey, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Selsey at a glance
- Postcode districts
- PO20
- Area
- West Sussex, England
- Price region
- South East England
- Nearest towns
- Bognor Regis (5.8 miles), Chichester (7 miles), Hayling Island (8.5 miles), Westergate (8.9 miles)
- Distance to Crawley
- about 37.2 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 postcode district PO20 in and around Selsey, along with neighbouring Bognor Regis, Chichester and Hayling Island.
Extensions available in Selsey
Two-storey rear extensions
Our South East England guide starts at £61,500 for this type.
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Two-storey side extensions
Selsey guide price from £94,500, Standard spec.
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Two-storey wraparound extensions
Selsey guide price from £132,500, Standard spec.
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Part single, part two-storey extensions
Selsey guide price from £79,000, Standard spec.
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Extensions over a garage
For homes in Selsey: typical guide from £34,500.
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First-floor extensions
From £27,500 in Selsey. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
For homes in Selsey: typical guide from £61,500.
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Two-storey extensions for detached houses
Design, approvals and build for Selsey homes. Guide from £94,500.
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Kitchen extensions with bedrooms above
From £61,500 (before kitchen units) in Selsey. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Our South East England guide starts at £61,500 (plus en-suite) for this type.
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 Selsey, 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 Selsey
Selsey 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 Selsey
Do you cover Selsey?
Yes. We cover Selsey (PO20) and the surrounding area, including Bognor Regis and Chichester. The first site visit is free.
What does a two-storey extension cost in Selsey?
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 Selsey do you cover?
Everywhere around it, including Bognor Regis (5.8 miles), Chichester (7 miles) and Hayling Island (8.5 miles), and the rest of West Sussex.