How to spot a cowboy builder
Homeowner
Most tradespeople are honest and skilled, but a minority cut corners or take the money and run. Knowing the warning signs makes you much harder to take advantage of. Here are the red flags worth watching for, whoever you hire and wherever you find them.
Classic warning signs
Pressure and urgency — "I can start tomorrow but the price is only good today" is a tactic, not a deal. Walk away from anyone rushing you into a decision.
Cash-only demands, no written quote, and no paperwork. A legitimate trade will give you a written quote and a receipt, and won't insist on cash to avoid a record.
Large sums up front. A deposit for materials on a big job can be reasonable, but being asked for most or all of the money before work starts is a major red flag.
Cold-callers and door-knockers, especially for roofing, driveways, rendering and damp — "we're working nearby and noticed your roof" is a well-worn opener for overpriced or unnecessary work.
Check before you commit
Ask for the business name and address, check it on Companies House if it's a limited company, and look the trade up online. Vague answers about who you'd actually be paying are a bad sign.
For regulated work, verify the registration: Gas Safe for gas, and a Part P scheme like NICEIC or NAPIT for electrics. Ask to see the card or certificate and check it on the official register, not just a logo on a van.
Ask for public liability insurance and, for bigger jobs, references or recent local work you can see. A confident, honest trade won't mind these questions.
How Rank My Builder helps
Tradespeople on Rank My Builder are verified against public registers (Gas Safe, NICEIC, NAPIT, Companies House) before they earn a Verified badge, so you're not relying on a logo alone.
Reviews are tied to real completed jobs on the platform, not anonymous strangers, and the 5-quote cap means you can compare a handful of trustworthy options rather than fielding cold calls. None of that replaces your own checks — but it stacks the odds in your favour.
FAQs
Is a cheap quote always a bad sign?
Not always, but a quote far below the others usually means something's been left out or will be charged for later. Ask exactly what's included and compare like for like before being swayed by the lowest number.
Should I ever pay the full amount up front?
No. For larger jobs a reasonable deposit or staged payments tied to progress are normal, but never pay the full price before the work is done. Tie payments to milestones you can see.
What if a trade only takes cash?
Cash isn't illegal, but a flat refusal to provide any written quote or receipt is a warning sign — often it's about avoiding a paper trail. Always get the job and price in writing whatever the payment method.
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