Two-storey extensions in Swanley
Homeowners in Swanley can use us for the whole project or just the drawings and approvals. Start with a free visit.
Swanley at a glance
- Postcode districts
- BR8 and DA4
- Area
- Kent, England
- Price region
- South East England
- Nearest towns
- Bexley (3.2 miles), Chelsfield (3.3 miles), Orpington (3.6 miles), Sidcup (3.6 miles)
- Distance to Maidstone
- about 17.4 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.
Swanley sits about 17.4 miles from Maidstone. Closer to home, Bexley is 3.2 miles away and Chelsfield 3.3 miles.
Extensions available in Swanley
Two-storey rear extensions
Swanley guide price from £61,500, Standard spec.
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Two-storey side extensions
From £94,500 in Swanley. Free visit to firm it up.
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Two-storey wraparound extensions
From £132,500 in Swanley. Free visit to firm it up.
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Part single, part two-storey extensions
Design, approvals and build for Swanley homes. Guide from £79,000.
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Extensions over a garage
For homes in Swanley: typical guide from £34,500.
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First-floor extensions
From £27,500 in Swanley. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Guide from £61,500 in Swanley, including VAT.
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Two-storey extensions for detached houses
Swanley guide price from £94,500, Standard spec.
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Kitchen extensions with bedrooms above
For homes in Swanley: typical guide from £61,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Design, approvals and build for Swanley homes. Guide from £61,500 (plus en-suite).
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 Swanley we measure distances to every boundary before suggesting a type.
Also available in Kent
- 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 Swanley
Swanley 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 Swanley
Do you cover Swanley?
Yes. We cover Swanley (BR8 and DA4) and the surrounding area, including Bexley and Chelsfield. The first site visit is free.
What does a two-storey extension cost in Swanley?
Using our South East England 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 £61,500–£83,000 including VAT. An extension over a garage is about £34,500–£50,500.
Which other places near Swanley do you cover?
Everywhere around it, including Bexley (3.2 miles), Chelsfield (3.3 miles) and Orpington (3.6 miles), and the rest of Kent.