Two-storey extensions in Northolt
Homeowners in Northolt can use us for the whole project or just the drawings and approvals. Start with a free visit.
Northolt at a glance
- Postcode districts
- UB5
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Greenford (1.5 miles), South Ruislip (1.8 miles), Sudbury (Greater London) (2 miles), Harrow on the Hill (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 Northolt (UB5) and the places around it, including Greenford (1.5 miles), South Ruislip (1.8 miles) and Sudbury (Greater London).
Extensions available in Northolt
Two-storey rear extensions
Design, approvals and build for Northolt homes. Guide from £67,000.
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Two-storey side extensions
Design, approvals and build for Northolt homes. Guide from £103,500.
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Two-storey wraparound extensions
From £144,500 in Northolt. Free visit to firm it up.
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Part single, part two-storey extensions
Our London guide starts at £86,500 for this type.
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Extensions over a garage
Guide from £38,000 in Northolt, including VAT.
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First-floor extensions
Guide from £30,000 in Northolt, including VAT.
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Two-storey extensions for semi-detached houses
For homes in Northolt: typical guide from £67,000.
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Two-storey extensions for detached houses
Our London guide starts at £103,500 for this type.
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Kitchen extensions with bedrooms above
Guide from £67,000 (before kitchen units) in Northolt, including VAT.
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Extra bedroom and en-suite extensions
For homes in Northolt: typical guide from £67,000 (plus en-suite).
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Northolt we measure distances to every boundary before suggesting a type.
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 Northolt
Northolt 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 Northolt
Do you cover Northolt?
Yes. We cover Northolt (UB5) and the surrounding area, including Greenford and South Ruislip. The first site visit is free.
What does a two-storey extension cost in Northolt?
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 Northolt do you cover?
Everywhere around it, including Greenford (1.5 miles), South Ruislip (1.8 miles) and Sudbury (Greater London) (2 miles), and the rest of Greater London.