Two-storey extensions in Bath
Homeowners in Bath can use us for the whole project or just the drawings and approvals. Start with a free visit.
Bath at a glance
- Postcode districts
- BA1 and BA2
- Area
- Somerset, England
- Price region
- South West England
- Nearest towns
- Keynsham (6.5 miles), Neston (Wiltshire) (7.4 miles), Trowbridge (7.7 miles), Publow (7.8 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 Bath (BA1 and BA2) and the places around it, including Keynsham (6.5 miles), Neston (Wiltshire) (7.4 miles) and Trowbridge.
Extensions available in Bath
Two-storey rear extensions
Bath guide price from £57,500, Standard spec.
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Two-storey side extensions
From £88,500 in Bath. Free visit to firm it up.
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Two-storey wraparound extensions
Guide from £124,000 in Bath, including VAT.
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Part single, part two-storey extensions
For homes in Bath: typical guide from £74,000.
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Extensions over a garage
From £32,500 in Bath. Free visit to firm it up.
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First-floor extensions
Bath guide price from £26,000, Standard spec.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Bath homes. Guide from £57,500.
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Two-storey extensions for detached houses
Design, approvals and build for Bath homes. Guide from £88,500.
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Kitchen extensions with bedrooms above
Bath guide price from £57,500 (before kitchen units), Standard spec.
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Extra bedroom and en-suite extensions
For homes in Bath: typical guide from £57,500 (plus en-suite).
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 Somerset
- 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 Bath
Bath 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 Bath
Do you cover Bath?
Yes. We cover Bath (BA1 and BA2) and the surrounding area, including Keynsham and Neston (Wiltshire). The first site visit is free.
What does a two-storey extension cost in Bath?
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 Bath do you cover?
Everywhere around it, including Keynsham (6.5 miles), Neston (Wiltshire) (7.4 miles) and Trowbridge (7.7 miles), and the rest of Somerset.