Two-storey extensions in Melksham
Everything for a two-storey extension in Melksham, in one place: types, guide prices for South West England, the approval rules in England and how to get started.
Melksham at a glance
- Postcode districts
- SN12
- Area
- Wiltshire, England
- Price region
- South West England
- Nearest towns
- Neston (Wiltshire) (3.8 miles), Corsham (4.7 miles), Trowbridge (4.8 miles), Chippenham (6.1 miles)
- Distance to Swindon
- about 20.1 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 Melksham (SN12) and the places around it, including Neston (Wiltshire) (3.8 miles), Corsham (4.7 miles) and Trowbridge.
Extensions available in Melksham
Two-storey rear extensions
Design, approvals and build for Melksham homes. Guide from £57,500.
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Two-storey side extensions
Melksham guide price from £88,500, Standard spec.
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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 Melksham. Free visit to firm it up.
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Extensions over a garage
Guide from £32,500 in Melksham, including VAT.
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First-floor extensions
For homes in Melksham: typical guide from £26,000.
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Two-storey extensions for semi-detached houses
Melksham guide price from £57,500, Standard spec.
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Two-storey extensions for detached houses
Guide from £88,500 in Melksham, including VAT.
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Kitchen extensions with bedrooms above
Our South West England guide starts at £57,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
Melksham guide price from £57,500 (plus en-suite), Standard spec.
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 Melksham 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 Melksham
Melksham 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 Melksham
Do you cover Melksham?
Yes. We cover Melksham (SN12) and the surrounding area, including Neston (Wiltshire) and Corsham. The first site visit is free.
What does a two-storey extension cost in Melksham?
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 Melksham do you cover?
Everywhere around it, including Neston (Wiltshire) (3.8 miles), Corsham (4.7 miles) and Trowbridge (4.8 miles), and the rest of Wiltshire.