5 Best Builders in Crawley for 2026

Crawley's housing stock is a real mix. You've got post-war council estates in Broadfield and Bewbush, 1970s and 1980s semi-detached estates across Maidenbower and Pound Hill, older Victorian and Edwardian terraces closer to the town centre, and newer executive developments out towards Copthorne and Worth. That variety matters when you're hiring a builder, because the work involved in extending a 1930s semi in Three Bridges is quite different from renovating a flat above a parade of shops on the High Street or fitting out a new-build in Forge Wood. Local builders who know the area will understand things like the clay-heavy soil across much of the Low Weald, which affects foundations and drainage, and they'll know which materials suit the styles of properties typical in each postcode.

The businesses on this page are drawn from third-party business listings and ranked primarily by public review rating and review count, with a small lift given to those that have a working website and phone number. Before any business appears here, we check its homepage to confirm that building work is what it primarily offers, which keeps unrelated trades from cluttering the list. Listings flagged as permanently closed are removed automatically. Where you see a Trust Verified badge on a business, that means it has additionally passed our full verification process, covering trade qualifications and accreditations, public liability insurance, trading history, customer review history, and registered company information. You can find the full list of what that involves on our How We Verify page. For any business that doesn't carry that badge, those checks are your responsibility to carry out before you book.

Before you commit to any builder, get at least three written quotes. Prices for a single-storey rear extension in Crawley typically range from around £25,000 to £45,000 depending on size, specification, and glazing, so there's real money at stake if you go with the first quote you receive. Ask each builder whether they'll handle planning permission and building regulations approval or whether you'll need to appoint someone separately. Check that structural calculations are included if the work involves removing load-bearing walls. Confirm who's responsible for the building control sign-off at the end of the job, and make sure you get a written contract that sets out the payment schedule clearly. Avoid paying large sums upfront.