How a single-storey extension actually runs, start to finish

Extensions are the biggest job most people take on, and the uncertainty of "what happens when" is usually more stressful than the disruption itself. Here's the shape a typical single-storey kitchen-diner extension follows.

Weeks 1–2: Groundworks

Footings are dug and inspected by building control before concrete goes in. This part is weather-dependent and can move the programme more than any other stage.

Weeks 2–4: Brickwork and structure

Walls go up to wall-plate height, structural steels (if needed) go in, and the roof structure follows.

Weeks 4–6: Roof, windows and doors

The roof is made watertight, and windows and doors go in. This is usually the point where the space starts to feel real, because it's enclosed for the first time.

Weeks 6–8: First fix

Plumbing, electrics and any underfloor heating are first-fixed, followed by plastering.

Weeks 8–10: Joinery finish

Skirting, architrave, doors and any bespoke joinery go in last, followed by decorating (if included) and a full site clean before handover.

Every job differs with size, ground conditions and how quickly decisions get made along the way — but this is roughly the shape to expect, and we'll give you a realistic version of this timeline specific to your job at the quote stage.