Two-storey extensions in Westbury
We design, get approval for and build two-storey extensions in Westbury and the surrounding area. Choose the type of extension below or book a free site visit.
Westbury at a glance
- Postcode districts
- BA13
- Area
- Wiltshire, England
- Price region
- South West England
- Nearest towns
- Warminster (3.9 miles), Trowbridge (4.2 miles), Frome (6.2 miles), Melksham (8.1 miles)
- Distance to Swindon
- about 27 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.
Westbury sits about 27.0 miles from Swindon. Closer to home, Warminster is 3.9 miles away and Trowbridge 4.2 miles.
Extensions available in Westbury
Two-storey rear extensions
For homes in Westbury: typical guide from £57,500.
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Two-storey side extensions
Guide from £88,500 in Westbury, including VAT.
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Two-storey wraparound extensions
Our South West England guide starts at £124,000 for this type.
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Part single, part two-storey extensions
From £74,000 in Westbury. Free visit to firm it up.
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Extensions over a garage
Design, approvals and build for Westbury homes. Guide from £32,500.
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First-floor extensions
Our South West England guide starts at £26,000 for this type.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Westbury homes. Guide from £57,500.
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Two-storey extensions for detached houses
Westbury guide price from £88,500, Standard spec.
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Kitchen extensions with bedrooms above
Guide from £57,500 (before kitchen units) in Westbury, including VAT.
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Extra bedroom and en-suite extensions
From £57,500 (plus en-suite) in Westbury. Free visit to firm it up.
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 Westbury, with a rough idea of the approval route and cost for each.
Also available in Wiltshire
- 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 Westbury
Westbury 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 Westbury
Do you cover Westbury?
Yes. We cover Westbury (BA13) and the surrounding area, including Warminster and Trowbridge. The first site visit is free.
What does a two-storey extension cost in Westbury?
Using our South West 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 £57,500–£78,000 including VAT. An extension over a garage is about £32,500–£47,500.
Which other places near Westbury do you cover?
Everywhere around it, including Warminster (3.9 miles), Trowbridge (4.2 miles) and Frome (6.2 miles), and the rest of Wiltshire.