Two-storey extensions in Kew
Everything for a two-storey extension in Kew, in one place: types, guide prices for London, the approval rules in England and how to get started.
Kew at a glance
- Postcode districts
- TW8
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Brentford (0.9 miles), Mortlake (1.2 miles), Chiswick (1.5 miles), East Sheen (1.5 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 Kew we also work in Brentford, Mortlake and Chiswick, and across the rest of Greater London. Postcode district in and near Kew: TW8.
Extensions available in Kew
Two-storey rear extensions
Our London guide starts at £67,000 for this type.
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Two-storey side extensions
Design, approvals and build for Kew homes. Guide from £103,500.
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Two-storey wraparound extensions
From £144,500 in Kew. Free visit to firm it up.
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Part single, part two-storey extensions
For homes in Kew: typical guide from £86,500.
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Extensions over a garage
Our London guide starts at £38,000 for this type.
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First-floor extensions
From £30,000 in Kew. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Kew guide price from £67,000, Standard spec.
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Two-storey extensions for detached houses
Guide from £103,500 in Kew, including VAT.
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Kitchen extensions with bedrooms above
Design, approvals and build for Kew homes. Guide from £67,000 (before kitchen units).
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Extra bedroom and en-suite extensions
From £67,000 (plus en-suite) in Kew. Free visit to firm it up.
Learn moreWhich type suits your house?
Which type suits your house in Kew depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
Also available in Greater London
- 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 Kew
Kew 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 Kew
Do you cover Kew?
Yes. We cover Kew (TW8) and the surrounding area, including Brentford and Mortlake. The first site visit is free.
What does a two-storey extension cost in Kew?
Using our London 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 £67,000–£90,500 including VAT. An extension over a garage is about £38,000–£55,000.
Which other places near Kew do you cover?
Everywhere around it, including Brentford (0.9 miles), Mortlake (1.2 miles) and Chiswick (1.5 miles), and the rest of Greater London.