Two-storey extensions in Tonbridge
Need more room in Tonbridge? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Tonbridge at a glance
- Postcode districts
- TN9, TN10 and TN11
- Area
- Kent, England
- Price region
- South East England
- Nearest towns
- Tunbridge Wells (4.3 miles), Sevenoaks (6.5 miles), Crowborough (10.4 miles), Maidstone (11.6 miles)
- Distance to Maidstone
- about 11.6 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.
Around Tonbridge we also work in Tunbridge Wells, Sevenoaks and Crowborough, and across the rest of Kent. Postcode districts in and near Tonbridge: TN9, TN10 and TN11.
Extensions available in Tonbridge
Two-storey rear extensions
Tonbridge guide price from £61,500, Standard spec.
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Two-storey side extensions
Tonbridge guide price from £94,500, Standard spec.
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Two-storey wraparound extensions
Our South East England guide starts at £132,500 for this type.
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Part single, part two-storey extensions
Our South East England guide starts at £79,000 for this type.
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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
For homes in Tonbridge: typical guide from £27,500.
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Two-storey extensions for semi-detached houses
Tonbridge guide price from £61,500, Standard spec.
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Two-storey extensions for detached houses
Tonbridge guide price from £94,500, Standard spec.
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Kitchen extensions with bedrooms above
Guide from £61,500 (before kitchen units) in Tonbridge, including VAT.
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Extra bedroom and en-suite extensions
Tonbridge guide price from £61,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
Which type suits your house in Tonbridge depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
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 Tonbridge
Tonbridge 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 Tonbridge
Do you cover Tonbridge?
Yes. We cover Tonbridge (TN9, TN10 and TN11) and the surrounding area, including Tunbridge Wells and Sevenoaks. The first site visit is free.
What does a two-storey extension cost in Tonbridge?
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 Tonbridge do you cover?
Everywhere around it, including Tunbridge Wells (4.3 miles), Sevenoaks (6.5 miles) and Crowborough (10.4 miles), and the rest of Kent.