Two-storey extensions in Sevenoaks
Need more room in Sevenoaks? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Sevenoaks at a glance
- Postcode districts
- TN13, TN14 and TN15
- Area
- Kent, England
- Price region
- South East England
- Nearest towns
- Chelsfield (6.5 miles), Tonbridge (6.5 miles), Biggin Hill (7.2 miles), Farnborough (Greater London) (7.9 miles)
- Distance to Maidstone
- about 14.2 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 Sevenoaks (TN13, TN14 and TN15) and the places around it, including Chelsfield (6.5 miles), Tonbridge (6.5 miles) and Biggin Hill.
Extensions available in Sevenoaks
Two-storey rear extensions
From £61,500 in Sevenoaks. Free visit to firm it up.
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Two-storey side extensions
Design, approvals and build for Sevenoaks homes. Guide from £94,500.
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Two-storey wraparound extensions
Guide from £132,500 in Sevenoaks, including VAT.
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Part single, part two-storey extensions
For homes in Sevenoaks: typical guide from £79,000.
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Extensions over a garage
Our South East England guide starts at £34,500 for this type.
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First-floor extensions
Sevenoaks guide price from £27,500, Standard spec.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Sevenoaks homes. Guide from £61,500.
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Two-storey extensions for detached houses
Guide from £94,500 in Sevenoaks, including VAT.
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Kitchen extensions with bedrooms above
Design, approvals and build for Sevenoaks homes. Guide from £61,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Sevenoaks guide price from £61,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Kent, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 Sevenoaks
Sevenoaks 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 Sevenoaks
Do you cover Sevenoaks?
Yes. We cover Sevenoaks (TN13, TN14 and TN15) and the surrounding area, including Chelsfield and Tonbridge. The first site visit is free.
What does a two-storey extension cost in Sevenoaks?
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 Sevenoaks do you cover?
Everywhere around it, including Chelsfield (6.5 miles), Tonbridge (6.5 miles) and Biggin Hill (7.2 miles), and the rest of Kent.