Cwmbran, South Wales Valleys
Single-storey rear extension in Cwmbran
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. If you live in Cwmbran 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.
We cover Cwmbran (NP44) as part of our South Wales Valleys work. A depth of 3 to 4 metres keeps many single-storey rear extensions in Cwmbran within permitted development, subject to the house's planning history.
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 Cwmbran?
In Cwmbran, our guide for a single-storey rear extension is £1,770–£2,880 per square metre including VAT for a standard specification. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £21,000–£34,500 |
| 4 m wide × 5 m deep (20 m²) | £35,500–£57,500 |
| 4 m wide × 6 m deep (24 m²) | £42,500–£69,000 |
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 Cwmbran?
The planning route for a single-storey rear extension in Cwmbran is set by Wales's householder rules and your council.
The Welsh Government's householder rules let many homes add a single-storey rear extension up to 4 metres deep and 4 metres high without a planning application. Deeper projects go through a householder application, because Wales has no prior approval route.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings 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 Cwmbran like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Cwmbran. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a single-storey rear extension in Cwmbran 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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 Cwmbran
From Cwmbran, the nearest places we also cover are Pontypool (3.4 miles) and Caerleon (4.3 miles).
- Single-storey rear extension in Pontypool
- Single-storey rear extension in Caerleon
- Single-storey rear extension in Risca
- Single-storey rear extension in Newport
- Single-storey rear extension in Abercarn
Other work in Cwmbran:
FAQ
Single-storey rear extension questions in Cwmbran
What postcode areas do you cover around Cwmbran?
Including NP44, and the surrounding South Wales Valleys area.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
Is a flat roof or a pitched roof better?
A warm flat roof keeps the extension low under first-floor windows and suits a roof lantern; a pitched or lean-to roof gives a vaulted ceiling. Both last for decades when built properly.
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.
Can you match the brick or stone on my Cwmbran house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Do I need planning permission for a rear extension in Cwmbran?
Often not for a single-storey rear extension of up to 4 metres under Welsh permitted development. Wales has no prior approval route for deeper extensions.