Swansea Bay
Knocking through to a rear extension in Swansea Bay
Steel beams, padstones and props to open the back of the house safely. Across Swansea Bay we handle the whole rear extension: survey, drawings, the planning route, building control and the build. Towns we cover here include Swansea, Neath and Briton Ferry.

Older houses in Swansea Bay often have solid brick back walls carrying a lot of weight, so the steel design comes early. Older terraces near the centre and post-war semis further out are typical of Swansea Bay. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
What does it cost in Swansea Bay?
As a guide, £3,500–£9,000 including VAT. Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
What approvals does it need in Swansea Bay?
In Wales a rear extension needs Building Regulations approval through the council or a registered approver, and is built to the Welsh Approved Documents, which differ from England's in places, including energy efficiency.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent.
Where in Swansea Bay do we work?
FAQ
Questions people ask
Can the whole back wall come out?
Often, with a beam across the full width or a goalpost frame. Some walls need a short pier left at the ends.
Do I need building control for a beam?
Yes. The calculations and the installed steel are checked.
How long does it take?
The wall itself usually comes out in a day or two, timed for when the extension is weathertight.
Do you cover all of Swansea Bay?
We cover 6 towns and districts in Swansea Bay, including Swansea, Neath and Briton Ferry.
Who builds the extension?
Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.