Verifying a builder's credentials is crucial. You should check if they are registered with recognized trade organizations such as the Federation of Master Builders (FMB) or the National Federation of Builders (NFB). Additionally, look for reviews and ratings on platforms like Checkatrade or TrustATrader, The Pro Trades and ask for references from previous clients.

Some common warning signs include demanding large upfront payments, offering quotes that seem too good to be true, and refusing to provide a written contract. Rogue builders may also pressure you into making quick decisions or ask for cash payments only. Always ensure that the builder provides a detailed written contract and payment plan linked to project milestones.

It is important to verify that your builder has valid public liability insurance and, if applicable, employer’s liability insurance. This protects you from potential liabilities in case of accidents or damages during the project.

A written contract outlines the scope of work, timeline, payment schedule, and materials to be used. It helps prevent misunderstandings and provides a legal recourse if issues arise. Ensure that every detail is clearly stated to avoid any hidden costs or disputes.

Avoid paying large sums upfront. A small deposit may be reasonable, but most reputable builders will not require significant payments before starting work. Payments should be made in stages, linked to project milestones.

If you suspect that you are dealing with a scammer, stop all payments and seek advice from trading standards or a consumer protection organization like Citizens Advice. It's also beneficial to report the incident to Action Fraud.