The 10 builders from Google's results for Harrow, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleHarrow
Build Worth manages design and construction projects, including loft conversions and house extensions, throughout London. The firm also fits kitchens and bathrooms alongside completing commercial building works and property refurbishments.
020 3769 7057 20 Irvine Ave, Harrow HA3 8QE
on GoogleSouth Harrow, Harrow
Building Contractors in Harrow, North London carries out commercial and residential construction projects across South Harrow and the surrounding area. The business manages general building works and structural alterations for local properties.
020 8422 9275 1 Eastcote Ln, South Harrow, Harrow HA2 8BW
on GoogleHarrow
Z & S Builders undertakes house extensions, plastering, chimney breast removal and ceiling replacement across Harrow. Its workmen also install UPVC windows, complete bathroom refurbishments and lay driveways for residential properties.
07539 118518 38 St St. Pauls Ave, Harrow HA3 9PS
on GoogleHarrow
Leeway Brothers is a Harrow building firm working in Pinner, Stanmore, Wealdstone and the HA1 to HA3 postcodes. It builds house extensions and converts lofts, fits kitchens and bathrooms, and takes on plumbing and electrical jobs.
on GoogleHarrow
Carroll Construction Solutions handles building and renovation projects for property owners across Harrow and West London. Services span from loft conversions to complete home refurbishments. The team focuses on delivering structural work and interior upgrades to suit individual specifications.
020 8930 8188 19 Bengarth Dr, Harrow HA3 5HX
Harrow
Ionesi Development constructs extensions, loft conversions, and new builds across Harrow and West London. Its team handles property renovations alongside tiling, painting, decorating, bathroom fitting, and landscaping services.
07417 573749 154 Courtenay Ave, Harrow HA3 6LW
Harrow, Pinner
House extensions, loft conversions, and full structural refurbishments form the core services at Arch Builders. Serving residential properties across Harrow, Pinner, and surrounding districts, the business manages projects from design through to completion. Additional options include kitchen installations and interior remodelling.
020 8930 6284 30 Melrose Rd, Harrow, Pinner HA5 5RA
Harrow
Property extensions, loft conversions, and home refurbishments are delivered across Harrow by Tcm Building Maintenance. The company coordinates structural alterations and urgent repairs, including work within the Harrow on the Hill conservation area. Projects are managed directly from initial assessment to site completion.
Harrow
KFM Building delivers house extensions, loft conversions, kitchen refurbishments, and bathroom remodelling in Bromley. The team manages projects from initial design through to completion, serving domestic clients seeking extra space.
Harrow
Building projects across Harrow and adjacent towns are managed by Lk Builders. Property services cover new builds, house extensions, refurbishments, and conversions for both lofts and garages. Tradespeople handle structural modifications alongside interior updating for domestic clients.
In Harrow, small structural job typically costs £1,700 – £6,000. Labour in Greater London runs 15% above the UK median, which accounts for most of the difference from the same job elsewhere.
These are the firms from Google's results for "builders harrow". They are ranked on Google rating, online presence and other factors.
The figures above are Harrow ranges. These explain what drives them, so you can read a quote properly.
Per-square-metre rates for light, standard and full renovations, prices job by job, rates by region, and the VAT, fees and contingency that sit on top of the build.
2026 prices for single and double garage conversions by garage type and room, what a quote should include, the fees and VAT around the build, and the rules in each UK nation.
Which jobs are notifiable, how the application routes work, what building control inspects, and what a completion certificate is worth when you come to sell.
For anything over about £10,000, yes. The JCT Home Owner contract is short, plain English and free to buy. It fixes the payment schedule and the process if things go wrong, which is exactly what an informal arrangement does not.
Materials up front is reasonable. A large percentage of the total is not. Stage payments against completed work are the norm, and a firm insisting on 50% before starting is a warning sign.