Two-storey extensions in Harlesden
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Harlesden.
Harlesden at a glance
- Postcode districts
- NW10
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Willesden (0.8 miles), Kensal Green (1.2 miles), Queen's Park (1.9 miles), Cricklewood (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.
Around Harlesden we also work in Willesden, Kensal Green and Queen's Park, and across the rest of Greater London. Postcode district in and near Harlesden: NW10.
Extensions available in Harlesden
Two-storey rear extensions
Guide from £67,000 in Harlesden, including VAT.
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Two-storey side extensions
Design, approvals and build for Harlesden homes. Guide from £103,500.
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Two-storey wraparound extensions
For homes in Harlesden: typical guide from £144,500.
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Part single, part two-storey extensions
From £86,500 in Harlesden. Free visit to firm it up.
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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
Guide from £30,000 in Harlesden, including VAT.
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Two-storey extensions for semi-detached houses
Harlesden guide price from £67,000, Standard spec.
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Two-storey extensions for detached houses
Design, approvals and build for Harlesden homes. Guide from £103,500.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Harlesden. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Design, approvals and build for Harlesden homes. Guide from £67,000 (plus en-suite).
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 Harlesden, 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 Harlesden
Harlesden 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 Harlesden
Do you cover Harlesden?
Yes. We cover Harlesden (NW10) and the surrounding area, including Willesden and Kensal Green. The first site visit is free.
What does a two-storey extension cost in Harlesden?
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 Harlesden do you cover?
Everywhere around it, including Willesden (0.8 miles), Kensal Green (1.2 miles) and Queen's Park (1.9 miles), and the rest of Greater London.