House Extensions in Harrold
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 Harrold is well within our regular working patch.
House Extensions for homes in Harrold.
Looking for house extensions in Harrold? J.C General Builders is a family-run father-and-son team — James and Callum Weir — covering Harrold and the rest of Bedfordshire. 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.
Typical jobs here are extensions and full refurbishments in Bedford and Kempston, patios and garden re-levelling around Flitwick and Silsoe, and driveways and drainage on the larger plots near Cranfield, Marston Moretaine and Harrold. Plenty of the older properties need underpinning-grade groundwork attention and honest advice before anything decorative goes near them.
House Extensions in Harrold 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 Harrold 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 Harrold — 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.
Also available in Harrold
Get a free quote for house extensions in Harrold
Tell us what you're planning and we'll come out, take a proper look and price it honestly. No pressure, no obligation.