Two-storey extensions in Hounslow
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Hounslow.
Hounslow at a glance
- Postcode districts
- TW2, TW3 and TW4
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Osterley (0.9 miles), Isleworth (0.9 miles), Heston (1.2 miles), Cranford (2.3 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.
We cover Hounslow (TW2, TW3 and TW4) and the places around it, including Osterley (0.9 miles), Isleworth (0.9 miles) and Heston.
Extensions available in Hounslow
Two-storey rear extensions
Hounslow guide price from £67,000, Standard spec.
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Two-storey side extensions
For homes in Hounslow: typical guide from £103,500.
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Two-storey wraparound extensions
Guide from £144,500 in Hounslow, including VAT.
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Part single, part two-storey extensions
Guide from £86,500 in Hounslow, including VAT.
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Extensions over a garage
Design, approvals and build for Hounslow homes. Guide from £38,000.
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First-floor extensions
From £30,000 in Hounslow. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Hounslow guide price from £67,000, Standard spec.
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Two-storey extensions for detached houses
Design, approvals and build for Hounslow homes. Guide from £103,500.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Hounslow. Free visit to firm it up.
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Extra bedroom and en-suite extensions
From £67,000 (plus en-suite) in Hounslow. Free visit to firm it up.
Learn moreWhich type suits your house?
Rear and side extensions suit most semi-detached and detached houses with room around them. Terraced and town-centre homes can take a two-storey extension too, with more care over neighbours, light and access.
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 Hounslow
Hounslow 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 Hounslow
Do you cover Hounslow?
Yes. We cover Hounslow (TW2, TW3 and TW4) and the surrounding area, including Osterley and Isleworth. The first site visit is free.
What does a two-storey extension cost in Hounslow?
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 Hounslow do you cover?
Everywhere around it, including Osterley (0.9 miles), Isleworth (0.9 miles) and Heston (1.2 miles), and the rest of Greater London.