Two-storey extensions in Truro
We design, get approval for and build two-storey extensions in Truro and the surrounding area. Choose the type of extension below or book a free site visit.
Truro at a glance
- Postcode districts
- TR1, TR2, TR3 and TR4
- Area
- Cornwall, England
- Price region
- South West England
- Nearest towns
- Falmouth (7.7 miles), Redruth (7.8 miles), Newquay (10.4 miles), Camborne (11.3 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 Truro we also work in Falmouth, Redruth and Newquay, and across the rest of Cornwall. Postcode districts in and near Truro: TR1, TR2, TR3 and TR4.
Extensions available in Truro
Two-storey rear extensions
For homes in Truro: typical guide from £57,500.
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Two-storey side extensions
For homes in Truro: typical guide from £88,500.
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Two-storey wraparound extensions
For homes in Truro: typical guide from £124,000.
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Part single, part two-storey extensions
Design, approvals and build for Truro homes. Guide from £74,000.
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Extensions over a garage
Truro guide price from £32,500, Standard spec.
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First-floor extensions
Guide from £26,000 in Truro, including VAT.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Truro homes. Guide from £57,500.
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Two-storey extensions for detached houses
From £88,500 in Truro. Free visit to firm it up.
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Kitchen extensions with bedrooms above
From £57,500 (before kitchen units) in Truro. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Truro guide price from £57,500 (plus en-suite), Standard spec.
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 Truro, with a rough idea of the approval route and cost for each.
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 Truro
Truro 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 Truro
Do you cover Truro?
Yes. We cover Truro (TR1, TR2, TR3 and TR4) and the surrounding area, including Falmouth and Redruth. The first site visit is free.
What does a two-storey extension cost in Truro?
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 Truro do you cover?
Everywhere around it, including Falmouth (7.7 miles), Redruth (7.8 miles) and Newquay (10.4 miles), and the rest of Cornwall.