Swansea, Swansea Bay
Single-storey rear extension in Swansea
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. We design, get the approvals for and build single-storey rear extensions in Swansea and the surrounding area, with one contract from the first survey to building control sign-off.
Swansea sits in Swansea Bay, with postcode districts including SA2, SA3, SA4 and SA5. On older terraces and post-war semis like those around Swansea, a single-storey rear extension is usually the simplest way to fix a small back kitchen without touching the bedrooms.
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 Swansea?
A single-storey rear extension in Swansea is priced at £1,770–£2,880 per square metre including VAT as a guide, before kitchen fit-out and fees. 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a single-storey rear extension in Swansea?
Whether your single-storey rear extension in Swansea needs a planning application depends on its size, your house and any local restrictions.
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. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Swansea like to extend?
Older terraces near the centre and post-war semis further out are typical of Swansea. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start. A depth of 3 to 4 metres keeps many single-storey rear extensions in Swansea within permitted development, subject to the house's planning history.
How a single-storey rear extension in Swansea 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.
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 Swansea
We also build single-storey rear extensions in nearby Clydach (4.7 miles) and Briton Ferry (5.4 miles).
- Single-storey rear extension in Clydach
- Single-storey rear extension in Briton Ferry
- Single-storey rear extension in Gorseinon
- Single-storey rear extension in Neath
- Single-storey rear extension in Llanelli
Other work in Swansea:
FAQ
Single-storey rear extension questions in Swansea
How long does a rear extension take to build in Swansea?
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.
Is a flat roof or a pitched roof better?
A warm flat roof keeps the extension low under first-floor windows and suits a roof lantern; a pitched or lean-to roof gives a vaulted ceiling. Both last for decades when built properly.
Do you handle building control in Swansea?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
Is the site visit in Swansea free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can you match the brick or stone on my Swansea house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.