House Extension Builders Covering Cardiff
Greentek Energy Ltd runs the whole project in-house: the initial drawings, the planning route, building control, groundworks, the structural build, the roof and glazing, and the internal finishing. Nothing is handed to a separate firm halfway through, which is exactly where most extensions lose time and where the price usually starts to move.
Extending a Cardiff terrace
Most single storey work in the city is on terraced and semi-detached houses, where the usual options are a rear extension across the back or a side return infill on the alley beside the kitchen. Both change the ground floor completely, and both need care with access: on a terrace, everything comes through the house or over a neighbour's boundary, and that shapes both the programme and the price.
Planning permission in Wales
Wales sets its own permitted development limits, and they are not identical to England's on depth, height or how much of the garden you can build over. Conservation areas around parts of Cardiff tighten them further. We check what your specific address allows before drawings are finalised, so the design starts from what's achievable rather than from what a website said about English rules.
Building control and party walls
Building regulations approval is always needed, even when planning permission isn't. It covers foundations, structure, insulation, drainage and fire safety, and we submit the application and work with the inspector at each stage. Where the extension sits near a shared boundary, we explain the party wall position early so notices are served in good time rather than holding the build up later.
Often done alongside an extension in Cardiff
- Kitchen Renovations in Cardiff — most rear extensions end up as a new kitchen-diner
- Full Home Renovation in Cardiff — when the rest of the house is due work at the same time
- Heating Upgrades in Cardiff — the existing system has to cope with the extra floor area
Beyond the city, the same team builds extensions in Newport, Bridgend, Neath and Merthyr Tydfil. For the full detail on how these projects run, see our Single Storey Extension page.
