The 10 extension builders from Google's results for Swansea, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
Wales has run its own planning system since 2016 and permitted development rights differ from England.
on GoogleFforest-fach, Swansea
Pro Able Group carries out residential and commercial construction across Swansea and South Wales. The firm undertakes full house refurbishments, property extensions, garage and loft conversions, as well as structural alterations, kitchen fitting and damp proofing.
01792 940242 Ystrad Rd, Fforest-fach, Swansea SA5 4LH
on GoogleFforest-fach, Swansea
No Limit Construction undertakes house extensions, property renovations, roofing and garage or loft conversions in Swansea and nearby areas including Mumbles and Gorseinon. The business carries out structural builds and conversions for residential clients.
07895 841555 43 Ael-Y-Bryn Rd, Fforest-fach, Swansea SA5 8JA
on GoogleSwansea
Ashdark Carpentry and Construction converts lofts of all sizes in Swansea, turning roof space into an extra bedroom or neat, organised storage. Each conversion is designed around the build and layout of the house, and the firm also builds house extensions.
on GoogleFforest-fach, Swansea
Jlynch Building provides home extension services throughout Swansea and South Wales. Its team handles custom extensions designed to expand and enhance existing living spaces to add functionality to residential properties.
07722 037399 Together Stronger (South Wales, Kingsway, Fforest-fach, Swansea SA5 4DL
on GoogleFforest-fach, Swansea
Full building services from initial planning to completion are provided by JM Building Contractors across Swansea and South Wales. Its team constructs new builds, house extensions, loft conversions, decking and complete property renovations.
01792 201448 2B Kingsway, Fforest-fach, Swansea SA5 4DL
on GoogleSwansea
House extensions across Swansea are handled by Daffodil Carpentry, including single-story rear builds, kitchen expansions, side returns, and wrap-around projects. The firm provides full project management and regularly works on Victorian and Edwardian properties in Uplands, Sketty, and Mumbles.
on GooglePyle, Bridgend
Dunraven Windows builds glazed extensions across Bridgend, Swansea, Cardiff, Newport, Carmarthen, Bristol, and Gloucester.
0800 975 9222 Heol Mostyn Village Farm Industrial Estate St David’s House, Pyle, Bridgend CF33 6BJ
Swansea
Will Begg Carpentry & Building Services provides home improvement work across Swansea, Morriston and the Gower peninsula. The team handles house extensions, property refurbishments, internal carpentry and plastering projects.
Swansea
This Swansea-based firm develops architectural design and planning proposals for residential property projects. Recent work in the area includes designing three-storey side extensions incorporating garages and loft conversions for semi-detached homes.
Swansea
Home extensions and conversions are carried out by Kg Carpentry and Building across Swansea and South Wales. The firm creates enlarged living spaces for homeowners, specialising in house extensions as well as attic and loft conversions.
In Swansea, single storey, per m² typically costs £1,600 – £2,300. Labour in Swansea runs 9% below the UK median, which accounts for most of the difference from the same job elsewhere.
These are the firms from Google's results for "house extensions swansea". They are ranked on Google rating, online presence and other factors.
The figures above are Swansea ranges. These explain what drives them, so you can read a quote properly.
Per-square-metre prices for single-storey, two-storey, side return and kitchen extensions, costs by size, the fees outside the build price, and planning limits by nation.
The permitted development limits for extensions, lofts, porches and outbuildings in England, where the rights do not apply, what prior approval and a certificate cost, and how Wales, Scotland and NI differ.
When the Party Wall Act applies, which notice to serve and how far ahead, what your neighbour can do, what a surveyor's award costs, and the rules in Scotland and NI.
Under permitted development, three metres for a terrace or semi and four for a detached, doubled to six and eight under the prior approval process. Height, materials and how much garden you cover all carry separate limits, and none of it applies in a conservation area.
If you are excavating within three metres of a neighbour's foundations or building on the boundary, yes. You must serve notice two months before work starts. Skipping it is the most common reason extension projects stall.