Two-storey extensions in Falmouth
Planning a bigger home in Falmouth? Compare extension types and guide prices below, then book a free site visit.
Falmouth at a glance
- Postcode districts
- TR10 and TR11
- Area
- Cornwall, England
- Price region
- South West England
- Nearest towns
- Truro (7.7 miles), Redruth (8.7 miles), Helston (9.5 miles), Camborne (10.8 miles)
- Distance to Truro
- about 7.7 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.
Around Falmouth we also work in Truro, Redruth and Helston, and across the rest of Cornwall. Postcode districts in and near Falmouth: TR10 and TR11.
Extensions available in Falmouth
Two-storey rear extensions
Falmouth guide price from £57,500, Standard spec.
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Two-storey side extensions
From £88,500 in Falmouth. Free visit to firm it up.
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Two-storey wraparound extensions
Guide from £124,000 in Falmouth, including VAT.
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Part single, part two-storey extensions
Our South West England guide starts at £74,000 for this type.
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Extensions over a garage
Design, approvals and build for Falmouth homes. Guide from £32,500.
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First-floor extensions
Design, approvals and build for Falmouth homes. Guide from £26,000.
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Two-storey extensions for semi-detached houses
Our South West England guide starts at £57,500 for this type.
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Two-storey extensions for detached houses
Our South West England guide starts at £88,500 for this type.
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Kitchen extensions with bedrooms above
Design, approvals and build for Falmouth homes. Guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Falmouth 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 Cornwall, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in Cornwall
- 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 Falmouth
Falmouth 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 Falmouth
Do you cover Falmouth?
Yes. We cover Falmouth (TR10 and TR11) and the surrounding area, including Truro and Redruth. The first site visit is free.
What does a two-storey extension cost in Falmouth?
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 Falmouth do you cover?
Everywhere around it, including Truro (7.7 miles), Redruth (8.7 miles) and Helston (9.5 miles), and the rest of Cornwall.