Two-storey extensions in Hayes
Need more room in Hayes? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Hayes at a glance
- Postcode districts
- UB3 and UB4
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Hillingdon (1.7 miles), West Drayton (2.2 miles), Southall (2.3 miles), Cranford (2.7 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 Hayes (UB3 and UB4) and the places around it, including Hillingdon (1.7 miles), West Drayton (2.2 miles) and Southall.
Extensions available in Hayes
Two-storey rear extensions
Hayes guide price from £67,000, Standard spec.
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Two-storey side extensions
Design, approvals and build for Hayes homes. Guide from £103,500.
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Two-storey wraparound extensions
Hayes guide price from £144,500, Standard spec.
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Part single, part two-storey extensions
Guide from £86,500 in Hayes, including VAT.
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Extensions over a garage
From £38,000 in Hayes. Free visit to firm it up.
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First-floor extensions
Design, approvals and build for Hayes homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
Guide from £67,000 in Hayes, including VAT.
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Two-storey extensions for detached houses
Hayes guide price from £103,500, Standard spec.
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Kitchen extensions with bedrooms above
For homes in Hayes: typical guide from £67,000 (before kitchen units).
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Extra bedroom and en-suite extensions
Our London guide starts at £67,000 (plus en-suite) for this type.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Greater London, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 Hayes
Hayes 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 Hayes
Do you cover Hayes?
Yes. We cover Hayes (UB3 and UB4) and the surrounding area, including Hillingdon and West Drayton. The first site visit is free.
What does a two-storey extension cost in Hayes?
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 Hayes do you cover?
Everywhere around it, including Hillingdon (1.7 miles), West Drayton (2.2 miles) and Southall (2.3 miles), and the rest of Greater London.