Extensions & lofts
Rear, side-return and wraparound extensions, and dormer or hip-to-gable loft conversions, including steels and structural work.
Built properly, by the family that does it.
Williamson & Sons is a family building firm in Cobham. We take on extensions, lofts, renovations, plastering and groundworks across the KT postcodes, and we see every job through from first visit to final handover.
More about the family →
What we do
Rear, side-return and wraparound extensions, and dormer or hip-to-gable loft conversions, including steels and structural work.
Whole-house refurbs, kitchens, bathrooms and knock-throughs. One firm runs the whole job.
Skimming, re-plastering, ceilings and external render. Flat, clean finishes ready to decorate.
Foundations, drainage, driveways and patios, for your extension or a new garden.
Family run
Simon Williamson has been building for 39 years. The firm is run by the family, with a trusted team of trades we've worked alongside for years. The same faces are on site from the first dig to the final snag, and we tell you straight if anything changes.
“If our name's on it, it gets done right.” Simon Williamson · Founder
Recent projects
Checkatrade member for 17 years
How we work
Stage 1
We come out, look at the job and talk through what you want. No charge.
Stage 2
A clear, itemised price with what's included and how long it will take.
Stage 3
The same team on site throughout, with updates as each stage is signed off.
Stage 4
A walk-round together, snags sorted, and the site left clean.
Where we work
Get in touch
Call or text Simon
Based in
Cobham, Surrey
Reviews
See us on Checkatrade →Free quotes · Williamson & Sons Ltd