Two-storey extensions in Beckenham
We design, get approval for and build two-storey extensions in Beckenham and the surrounding area. Choose the type of extension below or book a free site visit.
Beckenham at a glance
- Postcode districts
- BR3
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Shortlands (1.4 miles), Bromley (1.7 miles), South Norwood (2.2 miles), Shirley (Greater London) (2.4 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.
We cover postcode district BR3 in and around Beckenham, along with neighbouring Shortlands, Bromley and South Norwood.
Extensions available in Beckenham
Two-storey rear extensions
Design, approvals and build for Beckenham homes. Guide from £67,000.
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Two-storey side extensions
Beckenham guide price from £103,500, Standard spec.
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Two-storey wraparound extensions
Design, approvals and build for Beckenham homes. Guide from £144,500.
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Part single, part two-storey extensions
From £86,500 in Beckenham. Free visit to firm it up.
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Extensions over a garage
Beckenham guide price from £38,000, Standard spec.
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First-floor extensions
For homes in Beckenham: typical guide from £30,000.
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Two-storey extensions for semi-detached houses
Beckenham guide price from £67,000, Standard spec.
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Two-storey extensions for detached houses
For homes in Beckenham: typical guide from £103,500.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Beckenham. Free visit to firm it up.
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Extra bedroom and en-suite extensions
For homes in Beckenham: typical guide from £67,000 (plus en-suite).
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 Beckenham
Beckenham 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 Beckenham
Do you cover Beckenham?
Yes. We cover Beckenham (BR3) and the surrounding area, including Shortlands and Bromley. The first site visit is free.
What does a two-storey extension cost in Beckenham?
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 Beckenham do you cover?
Everywhere around it, including Shortlands (1.4 miles), Bromley (1.7 miles) and South Norwood (2.2 miles), and the rest of Greater London.