Two-storey extensions in Worthing
Everything for a two-storey extension in Worthing, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Worthing at a glance
- Postcode districts
- BN11, BN12, BN13 and BN14
- Area
- West Sussex, England
- Price region
- South East England
- Nearest towns
- Lancing (2.4 miles), Shoreham-by-Sea (4.6 miles), Steyning (5.2 miles), Rustington (5.8 miles)
- Distance to Crawley
- about 22 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 districts BN11, BN12, BN13 and BN14 in and around Worthing, along with neighbouring Lancing, Shoreham-by-Sea and Steyning.
Extensions available in Worthing
Two-storey rear extensions
Design, approvals and build for Worthing homes. Guide from £61,500.
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Two-storey side extensions
For homes in Worthing: typical guide from £94,500.
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Two-storey wraparound extensions
For homes in Worthing: typical guide from £132,500.
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Part single, part two-storey extensions
Design, approvals and build for Worthing homes. Guide from £79,000.
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Extensions over a garage
From £34,500 in Worthing. Free visit to firm it up.
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First-floor extensions
Worthing guide price from £27,500, Standard spec.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Worthing homes. Guide from £61,500.
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Two-storey extensions for detached houses
For homes in Worthing: typical guide from £94,500.
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Kitchen extensions with bedrooms above
Guide from £61,500 (before kitchen units) in Worthing, including VAT.
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Extra bedroom and en-suite extensions
For homes in Worthing: typical guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear and side extensions suit most semi-detached and detached houses with room around them. Terraced and town-centre homes can take a two-storey extension too, with more care over neighbours, light and access.
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 Worthing
Worthing 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 Worthing
Do you cover Worthing?
Yes. We cover Worthing (BN11, BN12, BN13 and BN14) and the surrounding area, including Lancing and Shoreham-by-Sea. The first site visit is free.
What does a two-storey extension cost in Worthing?
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 Worthing do you cover?
Everywhere around it, including Lancing (2.4 miles), Shoreham-by-Sea (4.6 miles) and Steyning (5.2 miles), and the rest of West Sussex.