Two-storey extensions in Willesden
Everything for a two-storey extension in Willesden, in one place: types, guide prices for London, the approval rules in England and how to get started.
Willesden at a glance
- Postcode districts
- NW10
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Kensal Green (0.4 miles), Harlesden (0.8 miles), Queen's Park (1.1 miles), Cricklewood (1.8 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 Willesden (NW10) and the places around it, including Kensal Green (0.4 miles), Harlesden (0.8 miles) and Queen's Park.
Extensions available in Willesden
Two-storey rear extensions
Guide from £67,000 in Willesden, including VAT.
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Two-storey side extensions
Design, approvals and build for Willesden homes. Guide from £103,500.
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Two-storey wraparound extensions
For homes in Willesden: typical guide from £144,500.
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Part single, part two-storey extensions
Guide from £86,500 in Willesden, including VAT.
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Extensions over a garage
For homes in Willesden: typical guide from £38,000.
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First-floor extensions
For homes in Willesden: typical guide from £30,000.
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Two-storey extensions for semi-detached houses
From £67,000 in Willesden. Free visit to firm it up.
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Two-storey extensions for detached houses
Design, approvals and build for Willesden homes. Guide from £103,500.
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Kitchen extensions with bedrooms above
Design, approvals and build for Willesden homes. Guide from £67,000 (before kitchen units).
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Extra bedroom and en-suite extensions
Guide from £67,000 (plus en-suite) in Willesden, including VAT.
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 Willesden
Willesden 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 Willesden
Do you cover Willesden?
Yes. We cover Willesden (NW10) and the surrounding area, including Kensal Green and Harlesden. The first site visit is free.
What does a two-storey extension cost in Willesden?
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 Willesden do you cover?
Everywhere around it, including Kensal Green (0.4 miles), Harlesden (0.8 miles) and Queen's Park (1.1 miles), and the rest of Greater London.