Llantrisant, South Wales Valleys
Two-storey rear extension in Llantrisant
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We design, get the approvals for and build two-storey rear extensions in Llantrisant and the surrounding area, with one contract from the first survey to building control sign-off.
Llantrisant and its postcode districts CF38 and CF72 are part of our South Wales Valleys coverage. Two-storey rear extensions suit semi-detached houses in Llantrisant best, where the extra bedroom matters as much as the bigger kitchen.
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 two-storey rear extension cost in Llantrisant?
In Llantrisant, our guide for a two-storey rear extension is £1,670–£2,510 per square metre including VAT for a standard specification. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £50,000–£75,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £80,500–£120,500 |
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 two-storey rear extension in Llantrisant?
Here is how the rules in Wales apply to a two-storey rear extension in Llantrisant.
Welsh rules allow a two-storey rear extension without an application only where the ground floor is no deeper than 4 metres, the upper floor no deeper than 3 metres and at least 10.5 metres remains to the rear boundary. Most homeowners still apply for householder planning permission.
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. In the South Wales Valleys we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning.
How a two-storey rear extension in Llantrisant 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Paperwork handled
Planning or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
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.
Two-storey rear extensions near Llantrisant
From Llantrisant, the nearest places we also cover are Pontypridd (4.5 miles) and Tonypandy (6.6 miles).
- Two-storey rear extension in Pontypridd
- Two-storey rear extension in Tonypandy
- Two-storey rear extension in Whitchurch
- Two-storey rear extension in Rhiwbina
- Two-storey rear extension in Caerphilly
Other work in Llantrisant:
FAQ
Two-storey 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.
What postcode areas do you cover around Llantrisant?
Including CF38 and CF72, and the surrounding South Wales Valleys area.
What is the 45-degree rule?
Many councils check that a two-storey extension does not cross a 45-degree line drawn from the nearest habitable window of the neighbouring house. We test it at the first drawing.
How much does a two-storey rear extension cost in Llantrisant?
As a guide, £1,670–£2,510 per square metre including VAT for a standard specification. For example, 3 m × 5 m footprint, two floors (30 m²): about £50,000–£75,500 at that rate. Your written price follows the survey.
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 you match the brick or stone on my Llantrisant house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.