Two-storey extensions in Trowbridge
Need more room in Trowbridge? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Trowbridge at a glance
- Postcode districts
- BA14 and BA15
- Area
- Wiltshire, England
- Price region
- South West England
- Nearest towns
- Westbury (4.2 miles), Melksham (4.8 miles), Neston (Wiltshire) (6.5 miles), Bath (7.7 miles)
- Distance to Swindon
- about 24.7 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.
We cover Trowbridge (BA14 and BA15) and the places around it, including Westbury (4.2 miles), Melksham (4.8 miles) and Neston (Wiltshire).
Extensions available in Trowbridge
Two-storey rear extensions
Guide from £57,500 in Trowbridge, including VAT.
Learn more
Two-storey side extensions
Guide from £88,500 in Trowbridge, including VAT.
Learn more
Two-storey wraparound extensions
Design, approvals and build for Trowbridge homes. Guide from £124,000.
Learn more
Part single, part two-storey extensions
Our South West England guide starts at £74,000 for this type.
Learn more
Extensions over a garage
Trowbridge guide price from £32,500, Standard spec.
Learn more
First-floor extensions
Trowbridge guide price from £26,000, Standard spec.
Learn more
Two-storey extensions for semi-detached houses
Our South West England guide starts at £57,500 for this type.
Learn more
Two-storey extensions for detached houses
For homes in Trowbridge: typical guide from £88,500.
Learn more
Kitchen extensions with bedrooms above
Our South West England guide starts at £57,500 (before kitchen units) for this type.
Learn more
Extra bedroom and en-suite extensions
Design, approvals and build for Trowbridge homes. Guide from £57,500 (plus en-suite).
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 Trowbridge 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 Trowbridge
Trowbridge 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 Trowbridge
Do you cover Trowbridge?
Yes. We cover Trowbridge (BA14 and BA15) and the surrounding area, including Westbury and Melksham. The first site visit is free.
What does a two-storey extension cost in Trowbridge?
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 Trowbridge do you cover?
Everywhere around it, including Westbury (4.2 miles), Melksham (4.8 miles) and Neston (Wiltshire) (6.5 miles), and the rest of Wiltshire.