Swansea, Swansea Bay
Kitchen-diner rear extension in Swansea
We plan and build kitchen-diner rear extensions for homeowners in Swansea. An open-plan kitchen, dining and family room that opens straight onto the garden. Start with a free site visit, then a written price once the design is agreed.
Swansea and its postcode districts SA2, SA3, SA4 and SA5 are part of our Swansea Bay coverage. We usually keep the working kitchen where the old one was and put the dining table in the new space by the doors, which suits most Swansea homes.
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 kitchen-diner rear extension cost in Swansea?
For Swansea we work from the Wales rate: £1,770–£2,880 per square metre of new floor, including VAT, 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 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a kitchen-diner rear extension in Swansea?
Here is how the rules in Wales apply to a kitchen-diner rear extension in Swansea.
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.
How a kitchen-diner rear extension in Swansea 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.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Kitchen-diner rear extensions near Swansea
We also build kitchen-diner rear extensions in nearby Clydach (4.7 miles) and Briton Ferry (5.4 miles).
- Kitchen-diner rear extension in Clydach
- Kitchen-diner rear extension in Briton Ferry
- Kitchen-diner rear extension in Gorseinon
- Kitchen-diner rear extension in Neath
- Kitchen-diner rear extension in Llanelli
Other work in Swansea:
FAQ
Kitchen-diner rear extension questions in Swansea
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.
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.
Can I have underfloor heating?
Yes. Wet underfloor heating in the new screed is the usual choice, often with the old room's radiators kept or replaced.
How much does a kitchen-diner rear extension cost in Swansea?
As a guide, £1,770–£2,880 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £21,000–£34,500 at that rate. Your written price follows the survey.
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.
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.