Two-storey extensions in Seven Sisters
Need more room in Seven Sisters? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Seven Sisters at a glance
- Postcode districts
- N15
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Stamford Hill (0.7 miles), Harringay (0.9 miles), Stroud Green (1.4 miles), Tottenham Hale (1.4 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 Seven Sisters we also work in Stamford Hill, Harringay and Stroud Green, and across the rest of Greater London. Postcode district in and near Seven Sisters: N15.
Extensions available in Seven Sisters
Two-storey rear extensions
From £67,000 in Seven Sisters. Free visit to firm it up.
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Two-storey side extensions
For homes in Seven Sisters: typical guide from £103,500.
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Two-storey wraparound extensions
From £144,500 in Seven Sisters. 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 Seven Sisters, including VAT.
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First-floor extensions
From £30,000 in Seven Sisters. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Seven Sisters homes. Guide from £67,000.
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Two-storey extensions for detached houses
For homes in Seven Sisters: typical guide from £103,500.
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Kitchen extensions with bedrooms above
Design, approvals and build for Seven Sisters 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 Seven Sisters, including VAT.
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 Seven Sisters, 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 Seven Sisters
Seven Sisters 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 Seven Sisters
Do you cover Seven Sisters?
Yes. We cover Seven Sisters (N15) and the surrounding area, including Stamford Hill and Harringay. The first site visit is free.
What does a two-storey extension cost in Seven Sisters?
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 Seven Sisters do you cover?
Everywhere around it, including Stamford Hill (0.7 miles), Harringay (0.9 miles) and Stroud Green (1.4 miles), and the rest of Greater London.