Two-storey extensions in Cowes
Everything for a two-storey extension in Cowes, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
We take on projects in Cowes by arrangement. Site visits here aren't free as standard, and we'll agree travel costs with you in writing first.
Cowes at a glance
- Postcode districts
- PO31
- Area
- The Isle of Wight, England
- Price region
- South East England
- Nearest towns
- East Cowes (0.5 miles), Newport (Isle of Wight) (4.2 miles), Ryde (6.3 miles), Sandown (9.7 miles)
- Distance to Newport (Isle of Wight)
- about 4.2 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 Cowes we also work in East Cowes, Newport (Isle of Wight) and Ryde, and across the rest of the Isle of Wight. Postcode district in and near Cowes: PO31.
Extensions available in Cowes
Two-storey rear extensions
For homes in Cowes: typical guide from £61,500.
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Two-storey side extensions
For homes in Cowes: typical guide from £94,500.
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Two-storey wraparound extensions
Guide from £132,500 in Cowes, including VAT.
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Part single, part two-storey extensions
Design, approvals and build for Cowes homes. Guide from £79,000.
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Extensions over a garage
For homes in Cowes: typical guide from £34,500.
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First-floor extensions
Cowes guide price from £27,500, Standard spec.
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Two-storey extensions for semi-detached houses
Guide from £61,500 in Cowes, including VAT.
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Two-storey extensions for detached houses
For homes in Cowes: typical guide from £94,500.
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Kitchen extensions with bedrooms above
Guide from £61,500 (before kitchen units) in Cowes, including VAT.
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Extra bedroom and en-suite extensions
Guide from £61,500 (plus en-suite) in Cowes, including VAT.
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 Cowes we measure distances to every boundary before suggesting a type.
Also available in the Isle of Wight
- 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 Cowes
Cowes 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 Cowes
Do you cover Cowes?
Yes. We cover Cowes (PO31) and the surrounding area, including East Cowes and Newport (Isle of Wight). Visits here are by arrangement.
What does a two-storey extension cost in Cowes?
Using our South East 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 £61,500–£83,000 including VAT. An extension over a garage is about £34,500–£50,500.
Which other places near Cowes do you cover?
Everywhere around it, including East Cowes (0.5 miles), Newport (Isle of Wight) (4.2 miles) and Ryde (6.3 miles), and the rest of the Isle of Wight.