Llantrisant, South Wales Valleys
Kitchen-diner rear extension in Llantrisant
For homes in Llantrisant, a kitchen-diner rear extension is often the simplest way to gain space without moving. An open-plan kitchen, dining and family room that opens straight onto the garden. We take it from survey to completion certificate.
Llantrisant is covered from our South Wales Valleys round, including CF38 and CF72. We usually keep the working kitchen where the old one was and put the dining table in the new space by the doors, which suits most Llantrisant homes.
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 kitchen-diner rear extension cost in Llantrisant?
For Llantrisant 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 kitchen-diner rear extension in Llantrisant?
Planning for a kitchen-diner rear extension in Llantrisant follows the Welsh householder rules.
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 Llantrisant like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Llantrisant. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a kitchen-diner rear extension in Llantrisant 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.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Kitchen-diner rear extensions near Llantrisant
We also build kitchen-diner rear extensions in nearby Pontypridd (4.5 miles) and Tonypandy (6.6 miles).
- Kitchen-diner rear extension in Pontypridd
- Kitchen-diner rear extension in Tonypandy
- Kitchen-diner rear extension in Whitchurch
- Kitchen-diner rear extension in Rhiwbina
- Kitchen-diner rear extension in Caerphilly
Other work in Llantrisant:
FAQ
Kitchen-diner rear extension questions in Llantrisant
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 you handle building control in Llantrisant?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
Can I have underfloor heating?
Yes. Wet underfloor heating in the new screed is the usual choice, often with the old room's radiators kept or replaced.
How much does a kitchen-diner rear extension cost in Llantrisant?
As a guide, £1,770–£2,880 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £21,000–£34,500 at that rate. Your written price follows the survey.
What postcode areas do you cover around Llantrisant?
Including CF38 and CF72, and the surrounding South Wales Valleys area.
Do I need planning permission for a rear extension in Llantrisant?
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.