Two-storey extensions in Hillingdon
Need more room in Hillingdon? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Hillingdon at a glance
- Postcode districts
- UB8, UB10 and UB11
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Uxbridge (1.7 miles), Hayes (1.7 miles), Ickenham (2.2 miles), West Drayton (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.
Around Hillingdon we also work in Uxbridge, Hayes and Ickenham, and across the rest of Greater London. Postcode districts in and near Hillingdon: UB8, UB10 and UB11.
Extensions available in Hillingdon
Two-storey rear extensions
Our London guide starts at £67,000 for this type.
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Two-storey side extensions
From £103,500 in Hillingdon. Free visit to firm it up.
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Two-storey wraparound extensions
For homes in Hillingdon: typical guide from £144,500.
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Part single, part two-storey extensions
Design, approvals and build for Hillingdon homes. Guide from £86,500.
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Extensions over a garage
From £38,000 in Hillingdon. Free visit to firm it up.
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First-floor extensions
Design, approvals and build for Hillingdon homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
For homes in Hillingdon: typical guide from £67,000.
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Two-storey extensions for detached houses
For homes in Hillingdon: typical guide from £103,500.
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Kitchen extensions with bedrooms above
Design, approvals and build for Hillingdon homes. 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?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Hillingdon, with a rough idea of the approval route and cost for each.
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 Hillingdon
Hillingdon 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 Hillingdon
Do you cover Hillingdon?
Yes. We cover Hillingdon (UB8, UB10 and UB11) and the surrounding area, including Uxbridge and Hayes. The first site visit is free.
What does a two-storey extension cost in Hillingdon?
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 Hillingdon do you cover?
Everywhere around it, including Uxbridge (1.7 miles), Hayes (1.7 miles) and Ickenham (2.2 miles), and the rest of Greater London.