Two-storey extensions in Calne
Everything for a two-storey extension in Calne, in one place: types, guide prices for South West England, the approval rules in England and how to get started.
Calne at a glance
- Postcode districts
- SN11
- Area
- Wiltshire, England
- Price region
- South West England
- Nearest towns
- Chippenham (5.3 miles), Devizes (6.1 miles), Melksham (7.4 miles), Corsham (7.7 miles)
- Distance to Swindon
- about 12.7 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 postcode district SN11 in and around Calne, along with neighbouring Chippenham, Devizes and Melksham.
Extensions available in Calne
Two-storey rear extensions
Design, approvals and build for Calne homes. Guide from £57,500.
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Two-storey side extensions
Guide from £88,500 in Calne, including VAT.
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Two-storey wraparound extensions
Calne guide price from £124,000, Standard spec.
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Part single, part two-storey extensions
From £74,000 in Calne. Free visit to firm it up.
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Extensions over a garage
Guide from £32,500 in Calne, including VAT.
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First-floor extensions
From £26,000 in Calne. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
For homes in Calne: typical guide from £57,500.
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Two-storey extensions for detached houses
For homes in Calne: typical guide from £88,500.
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Kitchen extensions with bedrooms above
Design, approvals and build for Calne homes. Guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
From £57,500 (plus en-suite) in Calne. Free visit to firm it up.
Learn moreWhich type suits your house?
Rear and side extensions suit most semi-detached and detached houses with room around them. Terraced and town-centre homes can take a two-storey extension too, with more care over neighbours, light and access.
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 Calne
Calne 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 Calne
Do you cover Calne?
Yes. We cover Calne (SN11) and the surrounding area, including Chippenham and Devizes. The first site visit is free.
What does a two-storey extension cost in Calne?
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 Calne do you cover?
Everywhere around it, including Chippenham (5.3 miles), Devizes (6.1 miles) and Melksham (7.4 miles), and the rest of Wiltshire.