Llantrisant, South Wales Valleys
Terraced house rear extension in Llantrisant
Rear and side return extensions for terraces, with access through the house and two neighbours. If you live in Llantrisant and want to know what a terraced house rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Llantrisant and its postcode districts CF38 and CF72 are part of our South Wales Valleys coverage. Terraced streets make up much of the housing in parts of the South Wales Valleys, and most rear extensions here go in without side access.
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 terraced house rear extension cost in Llantrisant?
In Llantrisant, our guide for a terraced house rear extension is £1,910–£3,070 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 wide × 4.5 m deep (13.5 m²) | £25,500–£41,500 |
| 3 m wide × 6 m deep (18 m²) | £34,500–£55,000 |
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 terraced house rear extension in Llantrisant?
Here is how the rules in Wales apply to a terraced house rear extension in Llantrisant.
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.
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. 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?
Llantrisant 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 terraced house 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.
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.
Terraced house rear extensions near Llantrisant
Neighbouring places we cover include Pontypridd (4.5 miles) and Tonypandy (6.6 miles).
- Terraced house rear extension in Pontypridd
- Terraced house rear extension in Tonypandy
- Terraced house rear extension in Whitchurch
- Terraced house rear extension in Rhiwbina
- Terraced house rear extension in Caerphilly
Other work in Llantrisant:
FAQ
Terraced house rear extension questions in Llantrisant
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.
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.
How do you keep the house clean?
Dust screens, floor protection and a single protected route through the house.
How long does a rear extension take to build in Llantrisant?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
What postcode areas do you cover around Llantrisant?
Including CF38 and CF72, and the surrounding South Wales Valleys area.