Extensions, loft conversions, full renovations. GroundWork Co. delivers on time, on budget, and built to last — with every project fully warranted.
Drag the handle to compare before and after on a selection of recent projects across London.
No surprises. Every project follows the same clear five-step process so you always know what's happening and when.
We visit within 48 hours, assess the site, take measurements and understand your vision.
Detailed written quote within 5 days. Fixed price — no hidden costs, no surprise invoices.
We handle planning permission and building regulations submissions where required.
Weekly progress updates, site foreman on-site daily. You're never in the dark.
Snagging list addressed, building regs sign-off, and your 10-year structural warranty issued.
General builders with deep expertise across residential extensions, conversions and renovations throughout London.
Single and double-storey rear extensions. Bi-folds, skylights, structural steel — we design and build the lot.
Dormer, hip-to-gable, mansard. New bedroom, home office or en-suite — we handle planning and build.
Reclaim the dead space beside your kitchen. Side return extensions that transform ground floor living.
Permitted development, no planning needed in most cases. Habitable room ready in 4–6 weeks.
Strip back to brick and start fresh. Full refurbs managed start to finish with a single fixed quote.
Plot to completion. We work with architects and structural engineers to deliver standalone new-build homes.
Get an indicative price in seconds. We'll confirm exact costs after a free site survey — no obligation.
Small rear extension. Actual cost confirmed after free survey.
Materials & Trade Partners
We're proud that most of our work comes from referrals and repeat clients. Here's what they say.
"They came in under quote by £3,000 and finished two weeks early. The kitchen extension is stunning — it's completely changed how we use the house."
"Three quotes, GroundWork were mid-range. Chose them for their transparency. Weekly updates, no mess left overnight. We'd use them again without hesitation."
"Full gut and renovation on a Victorian terrace — structural work, new layout, the works. GroundWork delivered a genuinely beautiful home. Absolutely recommend."
Book your free site survey. No obligation, no hard sell — just an honest assessment and a fixed-price quote within 5 days.