Abertillery, South Wales Valleys
Single-storey rear extension in Abertillery
Thinking about a single-storey rear extension in Abertillery? 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.
Abertillery sits in the South Wales Valleys, with postcode districts including NP13. A single-storey rear extension in Abertillery 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 Abertillery?
Guide prices for a single-storey rear extension in Abertillery start from our Wales rate of £1,770–£2,880 per square metre, including VAT. 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 Abertillery?
Whether your single-storey rear extension in Abertillery needs a planning application depends on its size, your house and any local restrictions.
In Wales a single-storey rear extension can often be permitted development if it projects no more than 4 metres beyond the rear wall and is no more than 4 metres high. Wales has no prior approval route for deeper extensions, so anything bigger needs a householder planning application.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent. At the first visit we measure what is there now and tell you which route fits: permitted development or a householder planning application.
What are homes in Abertillery like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Abertillery. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a single-storey rear extension in Abertillery 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.
Approvals
Permitted development check or householder planning application, then Building Regulations drawings to the Welsh Approved Documents and structural calculations, plus party wall notices where they apply.
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 Abertillery
Close by, we work in Pontypool, about 4.3 miles away, and Ebbw Vale, about 4.5 miles away.
- Single-storey rear extension in Pontypool
- Single-storey rear extension in Ebbw Vale
- Single-storey rear extension in Brynmawr
- Single-storey rear extension in Blackwood
- Single-storey rear extension in Bargoed
Other work in Abertillery:
FAQ
Single-storey rear extension questions in Abertillery
Can you match the brick or stone on my Abertillery house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
How long does a rear extension take to build in Abertillery?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Does it add value to the house?
Nationwide's October 2025 house price research found that a 10% increase in floor area is linked to about 5% higher value on average. It is a guide, not a promise; local agents can tell you what extended homes on your street sell for.
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.
Do I need a party wall agreement?
In Wales, usually yes if the extension is on or near a shared boundary or close to a neighbour's foundations. We serve the notices.
Is the site visit in Abertillery free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.