Building contractors · London
Extensions and renovations, built properly.
From a single-storey rear extension to a full house refurbishment, we take on London homes and finish them to a standard we're happy to put our name to, on a clear written price agreed before we start.
- Fully insured
- Free written quotes
- 15+ years on the tools
- All London boroughs
Why homeowners trust us
Fixed written quotes
A detailed, itemised price before a single tool comes out of the van. No day-rate surprises.
Fully insured, regs-compliant
Public liability cover on every job and work signed off to current UK building regulations.
One team, start to finish
Groundwork to decorating handled in-house. You deal with us, not five different trades.
A tidy, respected home
Dust sheets down, site swept daily, and the same crew back each morning until it's done.
Watch a London terrace go up
What we do
Every trade a London home needs, under one roof.
We're a full-service building contractor. That means the structural work, the first and second fix, and the finish are all managed by one team on one programme. The single biggest reason projects run late is coordination, and we take that off your hands.
Extensions
Single and double-storey, rear and side-return extensions, with drawings and building control through to the decorated room.
02Renovations & refurbishments
Full house renovations, structural alterations, knock-throughs, damp and rot work, period restoration.
03Kitchens & bathrooms
Supplied and fitted, including plumbing, electrics, tiling and plastering, finished to a hard-wearing standard.
04Loft conversions
Dormers, staircases, insulation and full fit-out, turning dead roof space into a proper bedroom or office.
05Roofing & brickwork
New roofs and re-roofs, flat roofs, repointing, garden and boundary walls, feature brickwork and repairs.
06Groundwork & driveways
Foundations, drainage, patios, block paving and resin driveways. The base everything else depends on.
Recent work
Jobs we've finished across London.
Every photo below is our own work, posted straight from site.
Loading recent projects…
Plan your extension
We've been building it beside you.
The house going up alongside this page is a standard London terrace. Footings and slab, ground floor, first floor, roof, then the rear extension, in the order we'd actually do it. Now it's up, try the options.
Ready to start
A gap in a London terrace, cleared and ready. Scroll down and we build it out behind you.
Indicative only, based on a typical mid-terrace about 6.4 m wide. Your plot, party walls and planning position change what's possible.
Rear extension & garden room, North London
Why choose us
Building work without the usual stress.
Time-served tradespeople
Our team are experienced builders, not subcontracted labour changing week to week. The same faces see your project through.
The price we quote is the price you pay
Written, itemised and fixed. If something genuinely unforeseen turns up behind a wall, we show you before we touch it.
A programme you can plan around
Realistic dates up front, a weekly update on where we are, and an honest heads-up the moment anything shifts.
Guaranteed workmanship
We stand behind everything we build, and pass on the manufacturer guarantees on the materials we install.
How it works
Four steps from first call to final sign-off.
Get in touch
Call, WhatsApp a few photos, or send the quote form. We'll tell you straight away whether it's a job for us.
Site visit & quote
We come out, measure up, talk through the options, and send a written itemised quote, free and with no pressure.
We build
Agreed start date, agreed programme. Site kept tidy and secure, with a weekly update on progress.
Walk-through & sign-off
We go round the finished work together, sort any snags, and hand over certificates and guarantees.
Reviews
What our customers say.
They built a two-storey extension for us and the whole experience was first class. Clear quote, no hidden costs, and the finish is superb. The lads were tidy, polite and always on time.
Full kitchen and bathroom refit. SLL PrimeBuild managed everything. Plumbing, tiling, electrics, the lot. Brilliant communication from start to finish. Couldn't recommend them more.
Re-roofed our house after storm damage. Quick to quote, fair price and the work was spotless. They even cleaned up better than they found it. Proper professionals.
Where we work
Building across London.
We work on homes right across the capital, from Victorian terraces and 1930s semis to period conversions and new-build. If you're in London, we'll come to you and quote it for free.
- North London
- South London
- East London
- West London
- Central London
- Surrounding areas
Ready to get your project priced?
Send us the details and we'll come out, measure up and give you a free written quote, with no obligation and no pressure.