Two-storey extensions in Chislehurst
Everything for a two-storey extension in Chislehurst, in one place: types, guide prices for London, the approval rules in England and how to get started.
Chislehurst at a glance
- Postcode districts
- BR7
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Bickley (1.5 miles), Sidcup (1.6 miles), Eltham (2.4 miles), Bromley (2.5 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 Chislehurst we also work in Bickley, Sidcup and Eltham, and across the rest of Greater London. Postcode district in and near Chislehurst: BR7.
Extensions available in Chislehurst
Two-storey rear extensions
Chislehurst guide price from £67,000, Standard spec.
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Two-storey side extensions
Guide from £103,500 in Chislehurst, including VAT.
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Two-storey wraparound extensions
From £144,500 in Chislehurst. Free visit to firm it up.
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Part single, part two-storey extensions
Design, approvals and build for Chislehurst homes. Guide from £86,500.
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Extensions over a garage
For homes in Chislehurst: typical guide from £38,000.
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First-floor extensions
Design, approvals and build for Chislehurst homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
From £67,000 in Chislehurst. Free visit to firm it up.
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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
Our London guide starts at £67,000 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
Chislehurst guide price from £67,000 (plus en-suite), Standard spec.
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 Chislehurst, 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 Chislehurst
Chislehurst 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 Chislehurst
Do you cover Chislehurst?
Yes. We cover Chislehurst (BR7) and the surrounding area, including Bickley and Sidcup. The first site visit is free.
What does a two-storey extension cost in Chislehurst?
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 Chislehurst do you cover?
Everywhere around it, including Bickley (1.5 miles), Sidcup (1.6 miles) and Eltham (2.4 miles), and the rest of Greater London.