Royal Tunbridge Wells, Kent
Single-storey rear extension in Royal Tunbridge Wells
Thinking about a single-storey rear extension in Royal Tunbridge Wells? Ground-floor space across the back of the house, usually for a kitchen, dining or family room. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
We cover Royal Tunbridge Wells (TN1, TN2, TN3 and TN4) as part of our Kent work. A single-storey rear extension in Royal Tunbridge Wells is mostly built from the garden side, so the house stays usable for most of the job.
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 single-storey rear extension cost in Royal Tunbridge Wells?
A single-storey rear extension in Royal Tunbridge Wells is priced at £2,130–£3,470 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 wide × 4 m deep (12 m²) | £25,500–£41,500 |
| 4 m wide × 5 m deep (20 m²) | £42,500–£69,500 |
| 4 m wide × 6 m deep (24 m²) | £51,000–£83,500 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a single-storey rear extension in Royal Tunbridge Wells?
Whether your single-storey rear extension in Royal Tunbridge Wells needs a planning application depends on its size, your house and any local restrictions.
In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part is within 2 metres of a boundary.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Royal Tunbridge Wells like to extend?
Commuter semis and detached houses make up much of Royal Tunbridge Wells, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a single-storey rear extension in Royal Tunbridge Wells comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Single-storey rear extensions near Royal Tunbridge Wells
Close by, we work in Tonbridge, about 4.3 miles away, and Crowborough, about 6.6 miles away.
- Single-storey rear extension in Tonbridge
- Single-storey rear extension in Crowborough
- Single-storey rear extension in Sevenoaks
- Single-storey rear extension in East Grinstead
- Single-storey rear extension in Uckfield
Other work in Royal Tunbridge Wells:
FAQ
Single-storey rear extension questions in Royal Tunbridge Wells
How much does a single-storey rear extension cost in Royal Tunbridge Wells?
As a guide, £2,130–£3,470 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £25,500–£41,500 at that rate. Your written price follows the survey.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Will the extension make the room behind it dark?
Not if it is designed well. Rooflights or a lantern over the old back room, and a wide opening into it, keep daylight reaching the middle of the house.
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.
What postcode areas do you cover around Royal Tunbridge Wells?
Including TN1, TN2, TN3 and TN4, and the surrounding Kent area.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.