Two-storey extensions in Biggin Hill
Everything for a two-storey extension in Biggin Hill, in one place: types, guide prices for London, the approval rules in England and how to get started.
Biggin Hill at a glance
- Postcode districts
- TN16
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Farnborough (Greater London) (3.5 miles), Oxted (4.3 miles), West Wickham (4.3 miles), Orpington (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 Biggin Hill we also work in Farnborough (Greater London), Oxted and West Wickham, and across the rest of Greater London. Postcode district in and near Biggin Hill: TN16.
Extensions available in Biggin Hill
Two-storey rear extensions
For homes in Biggin Hill: typical guide from £67,000.
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Two-storey side extensions
Biggin Hill guide price from £103,500, Standard spec.
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Two-storey wraparound extensions
For homes in Biggin Hill: typical guide from £144,500.
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Part single, part two-storey extensions
Biggin Hill guide price from £86,500, Standard spec.
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Extensions over a garage
Biggin Hill guide price from £38,000, Standard spec.
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First-floor extensions
Biggin Hill guide price from £30,000, Standard spec.
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Two-storey extensions for semi-detached houses
Guide from £67,000 in Biggin Hill, including VAT.
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Two-storey extensions for detached houses
Design, approvals and build for Biggin Hill homes. Guide from £103,500.
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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
Biggin Hill guide price from £67,000 (plus en-suite), Standard spec.
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 Biggin Hill 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 Biggin Hill
Biggin Hill 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 Biggin Hill
Do you cover Biggin Hill?
Yes. We cover Biggin Hill (TN16) and the surrounding area, including Farnborough (Greater London) and Oxted. The first site visit is free.
What does a two-storey extension cost in Biggin Hill?
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 Biggin Hill do you cover?
Everywhere around it, including Farnborough (Greater London) (3.5 miles), Oxted (4.3 miles) and West Wickham (4.3 miles), and the rest of Greater London.