Two-storey extensions in Sidmouth
We design, get approval for and build two-storey extensions in Sidmouth and the surrounding area. Choose the type of extension below or book a free site visit.
Sidmouth at a glance
- Postcode districts
- EX10, EX11 and EX12
- Area
- Devon, England
- Price region
- South West England
- Nearest towns
- Honiton (7.8 miles), Exmouth (8.8 miles), Heavitree (11.4 miles), Dawlish (12.5 miles)
- Distance to Plymouth
- about 45.4 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 Sidmouth (EX10, EX11 and EX12) and the places around it, including Honiton (7.8 miles), Exmouth (8.8 miles) and Heavitree.
Extensions available in Sidmouth
Two-storey rear extensions
Guide from £57,500 in Sidmouth, including VAT.
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Two-storey side extensions
Sidmouth 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
For homes in Sidmouth: typical guide from £74,000.
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Extensions over a garage
From £32,500 in Sidmouth. Free visit to firm it up.
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First-floor extensions
Design, approvals and build for Sidmouth homes. Guide from £26,000.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Sidmouth homes. Guide from £57,500.
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Two-storey extensions for detached houses
Sidmouth guide price from £88,500, Standard spec.
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Kitchen extensions with bedrooms above
For homes in Sidmouth: typical guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
For homes in Sidmouth: typical guide from £57,500 (plus en-suite).
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Sidmouth, with a rough idea of the approval route and cost for each.
Also available in Devon
- 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 Sidmouth
Sidmouth 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 Sidmouth
Do you cover Sidmouth?
Yes. We cover Sidmouth (EX10, EX11 and EX12) and the surrounding area, including Honiton and Exmouth. The first site visit is free.
What does a two-storey extension cost in Sidmouth?
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 Sidmouth do you cover?
Everywhere around it, including Honiton (7.8 miles), Exmouth (8.8 miles) and Heavitree (11.4 miles), and the rest of Devon.