Two-storey extensions in Harrow Weald
Need more room in Harrow Weald? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Harrow Weald at a glance
- Postcode districts
- HA7
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Wealdstone (0.7 miles), Hatch End (1.6 miles), Harrow (2.2 miles), Pinner (2.2 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 HA7 in and around Harrow Weald, along with neighbouring Wealdstone, Hatch End and Harrow.
Extensions available in Harrow Weald
Two-storey rear extensions
Guide from £67,000 in Harrow Weald, including VAT.
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Two-storey side extensions
Design, approvals and build for Harrow Weald homes. Guide from £103,500.
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Two-storey wraparound extensions
Guide from £144,500 in Harrow Weald, including VAT.
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Part single, part two-storey extensions
From £86,500 in Harrow Weald. Free visit to firm it up.
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Extensions over a garage
From £38,000 in Harrow Weald. Free visit to firm it up.
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First-floor extensions
From £30,000 in Harrow Weald. 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
Design, approvals and build for Harrow Weald homes. Guide from £103,500.
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Kitchen extensions with bedrooms above
Our London guide starts at £67,000 (before kitchen units) for this type.
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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?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Harrow Weald we also design annexes, home offices and bedrooms over garages.
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 Harrow Weald
Harrow Weald 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 Harrow Weald
Do you cover Harrow Weald?
Yes. We cover Harrow Weald (HA7) and the surrounding area, including Wealdstone and Hatch End. The first site visit is free.
What does a two-storey extension cost in Harrow Weald?
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 Harrow Weald do you cover?
Everywhere around it, including Wealdstone (0.7 miles), Hatch End (1.6 miles) and Harrow (2.2 miles), and the rest of Greater London.