Two-storey extensions in Penzance
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Penzance.
Penzance at a glance
- Postcode districts
- TR17, TR18, TR19, TR20 and TR26
- Area
- Cornwall, England
- Price region
- South West England
- Nearest towns
- Helston (11.9 miles), Camborne (12.5 miles), Redruth (15.9 miles), Falmouth (20.8 miles)
- Distance to Truro
- about 23.6 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 districts TR17, TR18, TR19, TR20 and TR26 in and around Penzance, along with neighbouring Helston, Camborne and Redruth.
Extensions available in Penzance
Two-storey rear extensions
Penzance guide price from £57,500, Standard spec.
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Two-storey side extensions
Guide from £88,500 in Penzance, including VAT.
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Two-storey wraparound extensions
For homes in Penzance: typical guide from £124,000.
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Part single, part two-storey extensions
For homes in Penzance: typical guide from £74,000.
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Extensions over a garage
From £32,500 in Penzance. Free visit to firm it up.
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First-floor extensions
Design, approvals and build for Penzance homes. Guide from £26,000.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Penzance homes. Guide from £57,500.
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Two-storey extensions for detached houses
For homes in Penzance: typical guide from £88,500.
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Kitchen extensions with bedrooms above
Our South West England guide starts at £57,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
For homes in Penzance: typical guide from £57,500 (plus en-suite).
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Penzance we measure distances to every boundary before suggesting a type.
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 Penzance
Penzance 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 Penzance
Do you cover Penzance?
Yes. We cover Penzance (TR17, TR18, TR19, TR20 and TR26) and the surrounding area, including Helston and Camborne. The first site visit is free.
What does a two-storey extension cost in Penzance?
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 Penzance do you cover?
Everywhere around it, including Helston (11.9 miles), Camborne (12.5 miles) and Redruth (15.9 miles), and the rest of Cornwall.