Porthcawl, South Wales Valleys
Single-storey rear extension in Porthcawl
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. If you live in Porthcawl and want to know what a single-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Porthcawl and its postcode districts CF36 are part of our South Wales Valleys coverage. A depth of 3 to 4 metres keeps many single-storey rear extensions in Porthcawl within permitted development, subject to the house's planning history.
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 single-storey rear extension cost in Porthcawl?
In Porthcawl, our guide for a single-storey rear extension is £1,770–£2,880 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 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 single-storey rear extension in Porthcawl?
Planning for a single-storey rear extension in Porthcawl follows the Welsh householder rules.
Welsh permitted development allows a single-storey rear extension of up to 4 metres in depth and 4 metres in height, subject to boundary and garden-coverage limits. There is no larger-extension prior approval scheme in Wales.
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 Porthcawl like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Porthcawl. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a single-storey rear extension in Porthcawl comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
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.
Single-storey rear extensions near Porthcawl
We also build single-storey rear extensions in nearby Pyle (2.6 miles) and Bridgend (5.7 miles).
- Single-storey rear extension in Pyle
- Single-storey rear extension in Bridgend
- Single-storey rear extension in Aberkenfig
- Single-storey rear extension in Coity
- Single-storey rear extension in Maesteg
Other work in Porthcawl:
FAQ
Single-storey rear extension questions in Porthcawl
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.
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 I need a structural engineer?
Yes for the beam over the new opening and usually for the foundations. Their calculations go to building control with the drawings.
Do you handle building control in Porthcawl?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
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.
Can you match the brick or stone on my Porthcawl house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.