Tonbridge, Kent
Two-storey rear extension in Tonbridge
We plan and build two-storey rear extensions for homeowners in Tonbridge. A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. Start with a free site visit, then a written price once the design is agreed.
Tonbridge sits in Kent, with postcode districts including TN9, TN10 and TN11. In Tonbridge, a two-storey rear extension is worth comparing with the cost of moving once stamp duty, agents' and legal fees are counted.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a two-storey rear extension cost in Tonbridge?
A two-storey rear extension in Tonbridge is priced at £2,020–£3,020 per square metre including VAT as a guide, before kitchen fit-out and fees. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £60,500–£90,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £97,000–£145,000 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a two-storey rear extension in Tonbridge?
Planning for a two-storey rear extension in Tonbridge follows the English householder rules.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Tonbridge like to extend?
Commuter semis and detached houses make up much of Tonbridge, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a two-storey rear extension in Tonbridge comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Two-storey rear extensions near Tonbridge
From Tonbridge, the nearest places we also cover are Royal Tunbridge Wells (4.3 miles) and Sevenoaks (6.5 miles).
- Two-storey rear extension in Royal Tunbridge Wells
- Two-storey rear extension in Sevenoaks
- Two-storey rear extension in Crowborough
- Two-storey rear extension in Maidstone
- Two-storey rear extension in Snodland
Other work in Tonbridge:
FAQ
Two-storey rear extension questions in Tonbridge
Do I need planning permission for a rear extension in Tonbridge?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Is the site visit in Tonbridge free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Does a two-storey rear extension need planning permission?
Almost always. England and Northern Ireland allow 3 metres without an application only if at least 7 metres remains to the rear boundary; Wales and Scotland are similar or stricter.
What postcode areas do you cover around Tonbridge?
Including TN9, TN10 and TN11, and the surrounding Kent area.
How long does a rear extension take to build in Tonbridge?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.