Caerphilly, South Wales Valleys
Wraparound extension in Caerphilly
We plan and build wraparound extensions for homeowners in Caerphilly. An L-shaped extension that fills the side return and runs across the back. Start with a free site visit, then a written price once the design is agreed.
We cover Caerphilly (CF83) as part of our South Wales Valleys work. In Caerphilly 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 Caerphilly?
Guide prices for a wraparound extension in Caerphilly start from our Wales rate of £2,050–£3,350 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 |
|---|---|
| L-shaped, about 22 m² of new floor | £45,000–£73,500 |
| L-shaped, about 30 m² of new floor | £61,500–£100,500 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a wraparound extension in Caerphilly?
Here is how the rules in Wales apply to a wraparound extension in Caerphilly.
In Wales a single-storey side extension can be permitted development if it is no more than 4 metres high and the house ends up no more than 50% wider than the original. Many side return infills on terraced streets, and most wraparounds, go through a householder application.
The Party Wall etc. Act 1996 also applies in Wales: two months' notice for work to a shared wall and one month for foundations dug close to a neighbour's building.
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 Caerphilly like to extend?
Caerphilly is largely terraced streets on sloping ground, where back gardens step up or down from the house. Excavation, retaining walls and drainage are priced at the survey.
How a wraparound extension in Caerphilly 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.
Wraparound extensions near Caerphilly
Close by, we work in Rhiwbina, about 3.2 miles away, and Whitchurch, about 4.3 miles away.
- Wraparound extension in Rhiwbina
- Wraparound extension in Whitchurch
- Wraparound extension in Risca
- Wraparound extension in Pontypridd
- Wraparound extension in Nelson
Other work in Caerphilly:
FAQ
Wraparound extension questions in Caerphilly
Can you match the brick or stone on my Caerphilly 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 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.
Will it take a lot of garden?
Less than a deep rear extension of the same area, because part of the space comes from the side passage.
Do you handle building control in Caerphilly?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
How long does a rear extension take to build in Caerphilly?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Do I need planning permission for a rear extension in Caerphilly?
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.