Two-storey extensions in Chelsfield
Need more room in Chelsfield? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Chelsfield at a glance
- Postcode districts
- BR6
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Orpington (1.7 miles), Farnborough (Greater London) (2.5 miles), Swanley (3.3 miles), Bickley (4.6 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 Chelsfield (BR6) and the places around it, including Orpington (1.7 miles), Farnborough (Greater London) (2.5 miles) and Swanley.
Extensions available in Chelsfield
Two-storey rear extensions
Our London guide starts at £67,000 for this type.
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Two-storey side extensions
Our London guide starts at £103,500 for this type.
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Two-storey wraparound extensions
Design, approvals and build for Chelsfield homes. Guide from £144,500.
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Part single, part two-storey extensions
Guide from £86,500 in Chelsfield, including VAT.
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Extensions over a garage
For homes in Chelsfield: typical guide from £38,000.
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First-floor extensions
Design, approvals and build for Chelsfield homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
From £67,000 in Chelsfield. Free visit to firm it up.
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Two-storey extensions for detached houses
For homes in Chelsfield: typical guide from £103,500.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Chelsfield. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Design, approvals and build for Chelsfield homes. Guide from £67,000 (plus en-suite).
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Chelsfield we also design annexes, home offices and bedrooms over garages.
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 Chelsfield
Chelsfield 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 Chelsfield
Do you cover Chelsfield?
Yes. We cover Chelsfield (BR6) and the surrounding area, including Orpington and Farnborough (Greater London). The first site visit is free.
What does a two-storey extension cost in Chelsfield?
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 Chelsfield do you cover?
Everywhere around it, including Orpington (1.7 miles), Farnborough (Greater London) (2.5 miles) and Swanley (3.3 miles), and the rest of Greater London.