Two-storey extensions in Osterley
Homeowners in Osterley can use us for the whole project or just the drawings and approvals. Start with a free visit.
Osterley at a glance
- Postcode districts
- TW3
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Isleworth (0.6 miles), Hounslow (0.9 miles), Heston (1 mile), Brentford (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.
We cover postcode district TW3 in and around Osterley, along with neighbouring Isleworth, Hounslow and Heston.
Extensions available in Osterley
Two-storey rear extensions
Our London guide starts at £67,000 for this type.
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Two-storey side extensions
Osterley guide price from £103,500, Standard spec.
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Two-storey wraparound extensions
Our London guide starts at £144,500 for this type.
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Part single, part two-storey extensions
Guide from £86,500 in Osterley, including VAT.
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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 Osterley. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Our London guide starts at £67,000 for this type.
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Two-storey extensions for detached houses
Guide from £103,500 in Osterley, including VAT.
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Kitchen extensions with bedrooms above
Guide from £67,000 (before kitchen units) in Osterley, including VAT.
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Extra bedroom and en-suite extensions
From £67,000 (plus en-suite) in Osterley. Free visit to firm it up.
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 Osterley we measure distances to every boundary before suggesting a type.
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 Osterley
Osterley 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 Osterley
Do you cover Osterley?
Yes. We cover Osterley (TW3) and the surrounding area, including Isleworth and Hounslow. The first site visit is free.
What does a two-storey extension cost in Osterley?
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 Osterley do you cover?
Everywhere around it, including Isleworth (0.6 miles), Hounslow (0.9 miles) and Heston (1 mile), and the rest of Greater London.