Blackwood, South Wales Valleys
Single-storey rear extension in Blackwood
We plan and build single-storey rear extensions for homeowners in Blackwood. Ground-floor space across the back of the house, usually for a kitchen, dining or family room. Start with a free site visit, then a written price once the design is agreed.
Blackwood and its postcode districts NP12 are part of our South Wales Valleys coverage. A depth of 3 to 4 metres keeps many single-storey rear extensions in Blackwood 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 Blackwood?
For Blackwood we work from the Wales rate: £1,770–£2,880 per square metre of new floor, including VAT, 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 |
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 Blackwood?
Whether your single-storey rear extension in Blackwood needs a planning application depends on its size, your house and any local restrictions.
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. 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 Blackwood like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Blackwood. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a single-storey rear extension in Blackwood 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.
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.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Single-storey rear extensions near Blackwood
We also build single-storey rear extensions in nearby Bargoed (1.5 miles) and Gelligaer (2.1 miles).
- Single-storey rear extension in Bargoed
- Single-storey rear extension in Gelligaer
- Single-storey rear extension in Abercarn
- Single-storey rear extension in Nelson
- Single-storey rear extension in Treharris
Other work in Blackwood:
FAQ
Single-storey rear extension questions in Blackwood
Is the site visit in Blackwood free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do you handle building control in Blackwood?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
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.
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 planning permission for a rear extension in Blackwood?
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.
Can you match the brick or stone on my Blackwood house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.