House Extensions in Downley
Single and double-storey rear extensions, side returns, wrap-arounds and garage conversions, built from foundation to finish. We're a father-and-son team based in Buckinghamshire and Downley is well within our regular working patch.
House Extensions for homes in Downley.
Looking for house extensions in Downley? J.C General Builders is a family-run father-and-son team — James and Callum Weir — covering Downley and the rest of Buckinghamshire. The people who quote your job are the people who turn up and do it.
An extension is the biggest thing most people ever have done to their home, and it's the job where cutting corners shows up first. We build extensions from the dig down: foundations, drainage diversions, brickwork, steels, roof, windows, plaster and finish.
We work to your architect's and engineer's drawings, liaise with Building Control at each inspection stage, and keep the existing house watertight and liveable for as long as possible before the break-through.
The work here is a real mix: garden walls and patios in Wendover and Great Missenden, rear extensions and knock-throughs in High Wycombe and Milton Keynes, drainage and hardstanding on rural plots out towards Waddesdon and Winslow. Chalk and clay ground means we pay proper attention to foundations and soakaways rather than guessing.
House Extensions in Downley includes
- Single-storey rear and side-return extensions
- Double-storey extensions and wrap-arounds
- Garage conversions and garage-to-room builds
- Foundations, underpinning and drainage diversions
- Steel beams, structural openings and knock-throughs
- Full internal finish — plastering, flooring, tiling and decoration
Our process on every Downley job.
Drawings and survey
We review your plans, check ground conditions and flag anything the drawings have missed before you commit.
Fixed quote and programme
Stage-by-stage pricing and a realistic week-by-week programme, agreed before we lift a shovel.
Groundwork to watertight
Foundations, drainage, brick and block, steels and roof — inspected by Building Control at each stage.
Fit-out and handover
First and second fix, plaster, floors, decoration and the final break-through into the existing house.
House Extensions in Downley — common questions
- How long does a single-storey extension take?
- Typically 10 to 16 weeks from breaking ground to finished, depending on size, ground conditions and how quickly decisions and materials land.
- Do I need planning permission?
- Many rear extensions fall under permitted development, but it depends on size, your property type and whether you're in a conservation area. We'll tell you honestly what we think and when you need to check with the council.
- Can we stay in the house during the build?
- Usually yes. We sequence the work so the break-through into the existing house happens as late as possible and keep the site sealed and clean.
House Extensions near Downley
Also available in Downley
Get a free quote for house extensions in Downley
Tell us what you're planning and we'll come out, take a proper look and price it honestly. No pressure, no obligation.