Two-storey extensions in Portslade
Everything for a two-storey extension in Portslade, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Portslade at a glance
- Postcode districts
- BN41
- Area
- East Sussex, England
- Price region
- South East England
- Nearest towns
- Hove (2.3 miles), Shoreham-by-Sea (2.6 miles), Brighton (3.5 miles), Lancing (4.7 miles)
- Distance to Brighton
- about 3.5 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 BN41 in and around Portslade, along with neighbouring Hove, Shoreham-by-Sea and Brighton.
Extensions available in Portslade
Two-storey rear extensions
For homes in Portslade: typical guide from £61,500.
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Two-storey side extensions
Portslade guide price from £94,500, Standard spec.
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Two-storey wraparound extensions
Our South East England guide starts at £132,500 for this type.
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Part single, part two-storey extensions
Design, approvals and build for Portslade homes. Guide from £79,000.
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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
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 Portslade homes. Guide from £61,500.
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Two-storey extensions for detached houses
Design, approvals and build for Portslade homes. Guide from £94,500.
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Kitchen extensions with bedrooms above
Design, approvals and build for Portslade homes. Guide from £61,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Guide from £61,500 (plus en-suite) in Portslade, including VAT.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in East Sussex, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in East 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 Portslade
Portslade 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 Portslade
Do you cover Portslade?
Yes. We cover Portslade (BN41) and the surrounding area, including Hove and Shoreham-by-Sea. The first site visit is free.
What does a two-storey extension cost in Portslade?
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 Portslade do you cover?
Everywhere around it, including Hove (2.3 miles), Shoreham-by-Sea (2.6 miles) and Brighton (3.5 miles), and the rest of East Sussex.