Two-storey extensions in Shoreham-by-Sea
Homeowners in Shoreham-by-Sea can use us for the whole project or just the drawings and approvals. Start with a free visit.
Shoreham-by-Sea at a glance
- Postcode districts
- BN43
- Area
- West Sussex, England
- Price region
- South East England
- Nearest towns
- Lancing (2.1 miles), Portslade (2.6 miles), Steyning (4.4 miles), Worthing (4.6 miles)
- Distance to Crawley
- about 19.7 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 Shoreham-by-Sea we also work in Lancing, Portslade and Steyning, and across the rest of West Sussex. Postcode district in and near Shoreham-by-Sea: BN43.
Extensions available in Shoreham-by-Sea
Two-storey rear extensions
Design, approvals and build for Shoreham-by-Sea homes. Guide from £61,500.
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Two-storey side extensions
Guide from £94,500 in Shoreham-by-Sea, including VAT.
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Two-storey wraparound extensions
From £132,500 in Shoreham-by-Sea. Free visit to firm it up.
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Part single, part two-storey extensions
Guide from £79,000 in Shoreham-by-Sea, including VAT.
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Extensions over a garage
For homes in Shoreham-by-Sea: typical guide from £34,500.
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First-floor extensions
From £27,500 in Shoreham-by-Sea. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Guide from £61,500 in Shoreham-by-Sea, including VAT.
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Two-storey extensions for detached houses
From £94,500 in Shoreham-by-Sea. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Design, approvals and build for Shoreham-by-Sea homes. Guide from £61,500 (before kitchen units).
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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?
Which type suits your house in Shoreham-by-Sea depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
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 Shoreham-by-Sea
Shoreham-by-Sea 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 Shoreham-by-Sea
Do you cover Shoreham-by-Sea?
Yes. We cover Shoreham-by-Sea (BN43) and the surrounding area, including Lancing and Portslade. The first site visit is free.
What does a two-storey extension cost in Shoreham-by-Sea?
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 Shoreham-by-Sea do you cover?
Everywhere around it, including Lancing (2.1 miles), Portslade (2.6 miles) and Steyning (4.4 miles), and the rest of West Sussex.