Two-storey extensions in Corsham
We design, get approval for and build two-storey extensions in Corsham and the surrounding area. Choose the type of extension below or book a free site visit.
Corsham at a glance
- Postcode districts
- SN14
- Area
- Wiltshire, England
- Price region
- South West England
- Nearest towns
- Neston (Wiltshire) (1.7 miles), Chippenham (3.1 miles), Melksham (4.7 miles), Calne (7.7 miles)
- Distance to Swindon
- about 19.3 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 Corsham (SN14) and the places around it, including Neston (Wiltshire) (1.7 miles), Chippenham (3.1 miles) and Melksham.
Extensions available in Corsham
Two-storey rear extensions
From £57,500 in Corsham. Free visit to firm it up.
Learn more
Two-storey side extensions
Our South West England guide starts at £88,500 for this type.
Learn more
Two-storey wraparound extensions
For homes in Corsham: typical guide from £124,000.
Learn more
Part single, part two-storey extensions
From £74,000 in Corsham. Free visit to firm it up.
Learn more
Extensions over a garage
Our South West England guide starts at £32,500 for this type.
Learn more
First-floor extensions
Design, approvals and build for Corsham homes. Guide from £26,000.
Learn more
Two-storey extensions for semi-detached houses
Corsham guide price from £57,500, Standard spec.
Learn more
Two-storey extensions for detached houses
For homes in Corsham: typical guide from £88,500.
Learn more
Kitchen extensions with bedrooms above
From £57,500 (before kitchen units) in Corsham. Free visit to firm it up.
Learn more
Extra bedroom and en-suite extensions
Corsham guide price from £57,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Wiltshire, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 Corsham
Corsham 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 Corsham
Do you cover Corsham?
Yes. We cover Corsham (SN14) and the surrounding area, including Neston (Wiltshire) and Chippenham. The first site visit is free.
What does a two-storey extension cost in Corsham?
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 Corsham do you cover?
Everywhere around it, including Neston (Wiltshire) (1.7 miles), Chippenham (3.1 miles) and Melksham (4.7 miles), and the rest of Wiltshire.