Treharris, South Wales Valleys
Wraparound extension in Treharris
Thinking about a wraparound extension in Treharris? An L-shaped extension that fills the side return and runs across the back. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
Treharris is covered from our South Wales Valleys round, including CF46. In Treharris we usually draw the wraparound and a simpler rear-only option side by side, so the planning risk and cost difference are clear.
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 wraparound extension cost in Treharris?
A wraparound extension in Treharris is priced at £2,050–£3,350 per square metre including VAT as a guide, before kitchen fit-out and fees. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| L-shaped, about 22 m² of new floor | £45,000–£73,500 |
| L-shaped, about 30 m² of new floor | £61,500–£100,500 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a wraparound extension in Treharris?
Here is how the rules in Wales apply to a wraparound extension in Treharris.
Welsh side-extension rules limit a single-storey side addition to 4 metres high and a 50% increase in the width of the original house, with tighter limits in conservation areas. Wraparounds usually need a planning application.
In Wales, as in England, the Party Wall etc. Act 1996 requires notice to neighbours before work to a shared wall or excavation near their foundations.
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 Treharris like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Treharris. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a wraparound extension in Treharris 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
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.
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.
Wraparound extensions near Treharris
From Treharris, the nearest places we also cover are Nelson (1.2 miles) and Gelligaer (2.2 miles).
- Wraparound extension in Nelson
- Wraparound extension in Gelligaer
- Wraparound extension in Mountain Ash
- Wraparound extension in Bargoed
- Wraparound extension in Blackwood
Other work in Treharris:
FAQ
Wraparound extension questions in Treharris
Can you match the brick or stone on my Treharris house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.
Does a wraparound need planning permission?
Often yes, because the side and rear parts are judged together. Some fit within permitted development; we check before drawing.
Is the site visit in Treharris free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How long does a rear extension take to build in Treharris?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.