Stockton-on-Tees, County Durham
Single-storey rear extension in Stockton-on-Tees
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. If you live in Stockton-on-Tees and want to know what a single-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Stockton-on-Tees is covered from our County Durham round, including TS17, TS18, TS19 and TS20. A single-storey rear extension in Stockton-on-Tees 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 Stockton-on-Tees?
In Stockton-on-Tees, our guide for a single-storey rear extension is £1,710–£2,790 per square metre including VAT for a standard specification. North East prices are among the lowest in our range; former mining ground is the main foundation variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £20,500–£33,500 |
| 4 m wide × 5 m deep (20 m²) | £34,000–£56,000 |
| 4 m wide × 6 m deep (24 m²) | £41,000–£67,000 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a single-storey rear extension in Stockton-on-Tees?
Whether your single-storey rear extension in Stockton-on-Tees needs a planning application depends on its size, your house and any local restrictions.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it 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 Stockton-on-Tees like to extend?
Brick terraces, colliery houses and post-war semis make up much of Stockton-on-Tees. Former mining areas often need a coal mining risk check before foundations are designed.
How a single-storey rear extension in Stockton-on-Tees comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Single-storey rear extensions near Stockton-on-Tees
We also build single-storey rear extensions in nearby Billingham (1.8 miles) and Thornaby-on-Tees (2.5 miles).
- Single-storey rear extension in Billingham
- Single-storey rear extension in Thornaby-on-Tees
- Single-storey rear extension in Ingleby Barwick
- Single-storey rear extension in Middlesbrough
- Single-storey rear extension in Yarm
Other work in Stockton-on-Tees:
FAQ
Single-storey rear extension questions in Stockton-on-Tees
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 Stockton-on-Tees?
Including TS17, TS18, TS19 and TS20, and the surrounding County Durham area.
Do I need a structural engineer?
Yes for the beam over the new opening and usually for the foundations. Their calculations go to building control with the drawings.
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.
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.
Is the site visit in Stockton-on-Tees free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.