Walton-on-Thames, Surrey
Single-storey rear extension in Walton-on-Thames
For homes in Walton-on-Thames, a single-storey rear extension is often the simplest way to gain space without moving. Ground-floor space across the back of the house, usually for a kitchen, dining or family room. We take it from survey to completion certificate.
Walton-on-Thames and its postcode districts KT12, TW16 and TW17 are part of our Surrey coverage. A single-storey rear extension in Walton-on-Thames 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 Walton-on-Thames?
In Walton-on-Thames, our guide for a single-storey rear extension is £2,130–£3,470 per square metre including VAT for a standard specification. 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 Walton-on-Thames?
Here is how the rules in England apply to a single-storey rear extension in Walton-on-Thames.
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. 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 Walton-on-Thames like to extend?
Commuter semis and detached houses make up much of Walton-on-Thames, and longer gardens make England's prior approval route for deeper rear extensions worth considering.
How a single-storey rear extension in Walton-on-Thames 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 Walton-on-Thames
Close by, we work in Sunbury-on-Thames, about 1.2 miles away, and Shepperton, about 1.7 miles away.
- Single-storey rear extension in Sunbury-on-Thames
- Single-storey rear extension in Shepperton
- Single-storey rear extension in West Molesey
- Single-storey rear extension in Weybridge
- Single-storey rear extension in Esher
Other work in Walton-on-Thames:
FAQ
Single-storey rear extension questions in Walton-on-Thames
How much does a single-storey rear extension cost in Walton-on-Thames?
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.
What postcode areas do you cover around Walton-on-Thames?
Including KT12, TW16 and TW17, and the surrounding Surrey area.
Can I stay in the house during the build?
Usually yes. The noisiest, dustiest stage, removing the back wall, is kept to the final weeks and screened off. Most families set up a temporary kitchen elsewhere in the house.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
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.
Do you handle building control in Walton-on-Thames?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.