Extensions and Knock-throughs

Many single-storey rear extensions can fall under permitted development if they meet specific limits on depth, height and materials. Corner plots, flats, listed buildings and conservation areas usually require permission. We assess your property and advise whether your proposal is PD or needs a full application.

Planning deals with how the extension looks and impacts neighbours/area. Building regulations cover safety, structure, insulation, drainage and electrics. Even if your extension is permitted development, building regulations approval is still required. We handle all regs compliance as part of our service.

If the wall is load-bearing, you’ll need structural calculations and an appropriate steel (often an RSJ or UB) with padstones and suitable bearings. Non-load-bearing walls can usually be removed without steel, but we always survey first. We work with qualified structural engineers and install to the drawings for Building Control sign-off.

Typical timelines: design & approvals 4–10 weeks (scope dependent), construction 4–12+ weeks for single-storey extensions, and 2–10 days for straightforward knock-throughs. We provide a clear programme and keep you updated at each stage.

Costs vary with size, specification, ground conditions, glazing, kitchens/bathrooms and finishes. We offer detailed, itemised quotations after a site visit so you have a fixed price aligned to your design and budget—no guesswork.

In most cases, yes. We plan phases to keep key areas usable where possible and maintain clean, safe work zones. There will be some noise and dust, especially during structural work, but we protect surfaces and tidy daily. If temporary kitchens or services are needed, we’ll arrange them with you.

Works near or on a shared boundary (e.g. foundations within 3–6 m of a neighbour’s structure, or altering a party wall) may trigger the Party Wall etc. Act 1996. If required, you must serve notice and obtain consent or an award. We’ll advise early and can point you to a party wall surveyor if needed.

Yes. Our experienced team manages the full build—groundworks, structure, roofing, windows/doors, electrics, plumbing, plastering and finishing—so your new space is ready to enjoy on completion.

You’ll receive relevant Building Control certificates, electrical certification, and manufacturer warranties for key components. We stand by our workmanship and outline guarantees clearly in your contract.