Llantrisant, South Wales Valleys
Rear extension planning drawings in Llantrisant
For homes in Llantrisant, a rear extension is often the simplest way to gain space without moving. Measured survey, design options, planning drawings and the application, handled for you. We take it from survey to completion certificate.
We cover Llantrisant (CF38 and CF72) as part of our South Wales Valleys work. Planning applications in Llantrisant go to the local planning authority covering Llantrisant, and we check its local design guidance for rear extensions before drawing.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
What do rear extension planning drawings cost in Llantrisant?
As a guide, £1,000–£2,500 including VAT for a single-storey rear extension, or £2,000–£3,500 for a two-storey scheme. Planning fees in Wales are set by the Welsh Government; we confirm the current householder fee when we prepare the application. 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 rear extension in Llantrisant?
Planning for a rear extension in Llantrisant follows the Welsh householder rules.
In Wales a rear extension of more than one storey can be permitted development if the ground floor projects no more than 4 metres and the upper floor no more than 3 metres, with at least 10.5 metres to the rear boundary. It is not permitted development in conservation areas, National Parks or National Landscapes, so many double-storey schemes need a householder application.
Welsh councils aim to decide householder applications within 8 weeks.
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 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 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.
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.
Rear extension planning drawings near Llantrisant
From Llantrisant, the nearest places we also cover are Pontypridd (4.5 miles) and Tonypandy (6.6 miles).
- Rear extension planning drawings in Pontypridd
- Rear extension planning drawings in Tonypandy
- Rear extension planning drawings in Whitchurch
- Rear extension planning drawings in Rhiwbina
- Rear extension planning drawings in Caerphilly
Other work in Llantrisant:
FAQ
Rear extension planning drawings questions in Llantrisant
What postcode areas do you cover around Llantrisant?
Including CF38 and CF72, and the surrounding South Wales Valleys area.
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.
Are the drawings mine?
You can use them to get other quotes, subject to the terms.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
What do rear extension planning drawings cost in Llantrisant?
As a guide, £1,000–£2,500 including VAT for a single-storey rear extension and £2,000–£3,500 for a two-storey scheme, covering the measured survey, design options and the application. The council fee is extra.
Is the site visit in Llantrisant free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.