Two-storey extensions in Warminster
Need more room in Warminster? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Warminster at a glance
- Postcode districts
- BA12
- Area
- Wiltshire, England
- Price region
- South West England
- Nearest towns
- Westbury (3.9 miles), Frome (6.4 miles), Trowbridge (8 miles), Melksham (11.8 miles)
- Distance to Swindon
- about 29.9 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 Warminster (BA12) and the places around it, including Westbury (3.9 miles), Frome (6.4 miles) and Trowbridge.
Extensions available in Warminster
Two-storey rear extensions
For homes in Warminster: typical guide from £57,500.
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Two-storey side extensions
Our South West England guide starts at £88,500 for this type.
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Two-storey wraparound extensions
Guide from £124,000 in Warminster, including VAT.
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Part single, part two-storey extensions
Design, approvals and build for Warminster homes. Guide from £74,000.
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Extensions over a garage
Our South West England guide starts at £32,500 for this type.
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First-floor extensions
Guide from £26,000 in Warminster, including VAT.
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Two-storey extensions for semi-detached houses
Our South West England guide starts at £57,500 for this type.
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Two-storey extensions for detached houses
For homes in Warminster: typical guide from £88,500.
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Kitchen extensions with bedrooms above
Warminster guide price from £57,500 (before kitchen units), Standard spec.
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Extra bedroom and en-suite extensions
From £57,500 (plus en-suite) in Warminster. Free visit to firm it up.
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Warminster we also design annexes, home offices and bedrooms over garages.
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 Warminster
Warminster 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 Warminster
Do you cover Warminster?
Yes. We cover Warminster (BA12) and the surrounding area, including Westbury and Frome. The first site visit is free.
What does a two-storey extension cost in Warminster?
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 Warminster do you cover?
Everywhere around it, including Westbury (3.9 miles), Frome (6.4 miles) and Trowbridge (8 miles), and the rest of Wiltshire.