Open today · 7am to 6pm Booking jobs from October
South-west London hello@crofton-builders.co.uk
What we do

Three things. Done properly.

Twenty-eight years building in south-west London. Extensions, lofts and full renovations. Same crew on every job. Fixed-price quotes in writing.

01 · 10 to 16 weeks · Fixed price

Extensions

Single-storey rear, double-storey side, wrap-around. Full design-and-build or just the build. Planning, party-wall, structural, build, sign-off, all under one roof.

What's included

  • Architect drawings and structural engineer calcs co-ordinated
  • Planning application (or PD certificate) handled by us
  • Party-wall notices coordinated with a surveyor we trust
  • Foundations, steels, brickwork, roof, plaster, second fix · same crew
  • Building Control sign-off in-house (LABC Partner Authority Scheme)
  • 10-year FMB insurance-backed workmanship guarantee
From £62,000 Typical 3.5m single-storey rear extension, fully fitted. Double-storey from £105,000. Wrap-around quoted per job. Always a written fixed-price quote first.
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Tom Crofton laying brickwork on a single-storey rear extension in Clapham
Dave Crofton inspecting a finished loft conversion in a south-west London terrace
02 · 8 to 12 weeks · Stay-in-the-house build

Loft conversions

Dormer, hip-to-gable, mansard, Velux. We've done every type of London loft. Most jobs run 8 to 12 weeks, with you staying in the house throughout. Steel through-roof, finished interior, no rush.

What we cover

  • Dormer (rear, side, full-width) · most common London conversion
  • Hip-to-gable conversions (end-terrace and semi-detached)
  • Mansard (where planning permits) · maximum head height
  • Velux-only conversions for fast, lower-cost upgrades
  • Stairs, plumbing, en-suite, electrics, plaster, second fix
  • Building Regs sign-off and fire-safety compliance throughout
From £48,000 Typical dormer loft on a Victorian terrace, fully fitted with bedroom and en-suite. Hip-to-gable from £55,000. Mansards quoted per job.
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03 · Whole-house · Sequenced trades

Full renovations

Knock-throughs, kitchens, bathrooms, whole-house refurbs. We sequence the trades so you're not living with bare concrete for six months. Tidy throughout. Same lead carpenter from start to handover.

What we cover

  • Kitchen extensions, knock-throughs, open-plan conversions
  • Bathroom and en-suite refurbs (full strip-out and refit)
  • Whole-house refurbishment with sequenced trades
  • Listed-building work (with conservation-area consents handled)
  • First and second fix plumbing, electrics, plastering, decor
  • 2-year workmanship guarantee on renovation works
From £18,500 Standard kitchen renovation including units, worktops, plumbing and re-tile. Bathroom refurb from £9,000. Whole-house quoted per project.
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A recently completed open-plan kitchen-diner renovation by Crofton Builders

Planning a build? Let's come for a look.

Free site visit. Written fixed-price quote within a week. No obligation. Booking from October.

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