William James Engineering — builders in London

What William James Engineering does — and what it typically costs in London

The ranges are what London homes typically pay, from Locufy's price guides. You can call William James Engineering for the exact figure.

Building & extensions

BuilderGeneral building work

£180–400per dayprice guide →

House extensionSingle or two-storey

£1,800–4,000per m²price guide →

Loft conversionAttic into a usable room

£30,000–95,000per projectprice guide →

Garage conversionGarage into living space

£10,000–30,000per projectprice guide →

Conservatory installerSupplied and built

£8,500–32,000per projectprice guide →

BricklayerWalls, piers and repairs

£200–380per dayprice guide →

GroundworksFoundations, drainage and levels

£2,500–15,000per projectprice guide →

Kitchens, bathrooms & interiors

Kitchen fitterUnits, worktops and appliances

£6,000–25,000per kitchenprice guide →

Bathroom fitterStrip out and full refit

£4,000–15,000per bathroomprice guide →

Wet room installerTanked and fully tiled

£5,000–15,000per roomprice guide →

TilerFloors and walls

£30–100per m²price guide →

PlastererSkimming and patch repairs

£200–700per roomprice guide →

Carpenter & joinerDoors, frames and fitted joinery

£180–400per dayprice guide →

Flooring installerWood, laminate and vinyl

£18–70per m²price guide →

Roofs, walls & windows

RooferPitched roofs and repairs

£150–2,000per jobprice guide →

Flat roofingFelt, rubber and fibreglass

£1,200–6,500per roofprice guide →

Roof repairSlipped slates and leaks

£150–1,000per repairprice guide →

Guttering installationNew gutters and downpipes

£400–1,600per jobprice guide →

Fascias & soffitsReplace rotten timber boards

£1,400–4,500per jobprice guide →

Window & double glazing installerSupplied and fitted

£350–1,500per windowprice guide →

Damp proofingSurvey and treatment

£500–4,000per jobprice guide →

Typical prices from Locufy's UK 2026 price guides — each guide explains what the job involves and what moves the price. Rendering and insulation installer are also offered, priced on survey.