Why an emergency is the worst moment to choose a plumber

Water is coming through the ceiling, the toilet won't stop running, or the boiler has died on the coldest night of the year. You grab your phone, search "emergency plumber near me" and ring the first number that answers. That is exactly the moment when a small minority of operators make their money, charging £300 for a job that should cost £80, or carrying out work a properly registered engineer would refuse to touch.

Before you ring anyone, do what you safely can. Shut off the stopcock (usually under the kitchen sink or in the front garden), open the lowest tap in the house to drain the system, and put a bucket under the leak. If you can smell gas, don't call a plumber at all — leave the property and ring the national gas emergency line from outside. Then take two minutes to screen the person you're about to let through the door.

Check for recognised trade registration

Any work on gas appliances, including boilers, hobs and gas fires, must legally be carried out by someone on the Gas Safe Register. Ask to see their ID card when they arrive, and look at both sides: the front confirms the photo and registration number, the back lists the specific types of work they are qualified to do. A card that covers boilers does not automatically cover cookers or gas fires. You can verify the number yourself rather than trusting a logo printed on a van.

For water plumbing there is no single licence in the UK, which is why registration schemes matter. Look for membership of a recognised body such as WaterSafe, TrustMark, or a trade association like the Chartered Institute of Plumbing and Heating Engineering or the Association of Plumbing and Heating Contractors. In Scotland, SNIPEF membership is a good sign. These schemes vet businesses for insurance, qualifications and a proper complaints process, so you have somewhere to escalate a dispute.

Get the price in writing before the van sets off

Ask for a text or email confirming the charges before they leave their base. A legitimate firm will do this without complaint. Make sure it covers:

• The call-out or attendance charge, and whether it is credited against the work
• The standard hourly rate and the out-of-hours or weekend rate, which is often double
• How parts are priced, including any markup
• Whether VAT is included, and at what rate
• How you will be told, and asked to approve, if the job turns out to be bigger than expected

Be wary of anyone demanding a large cash sum upfront before starting, refusing to put a figure in writing, or telling you the price can only be settled "once we see it". Never pay the whole balance in cash. Card or bank transfer leaves a paper trail and, if things go wrong, gives you far more options for recovering your money.

Read the reviews like a sceptic

Reviews are useful, but only if you read them properly. Prioritise recent, local, specific feedback — "arrived within 40 minutes on a Sunday and replaced the isolation valve" tells you far more than a string of five-star one-liners. Read the one and two-star reviews as well, and pay attention to how the business replied; a measured response to a fair complaint is reassuring, a defensive rant is not.

Check that the business actually exists. A limited company should appear on the Companies House register, and a genuine local trader will have a business address or landline, not just a mobile number. Be cautious with national lead-generation websites: the firm that turns up may be a subcontractor you have read nothing about. Neighbours, a local community group or a trusted independent trader will often give you a better recommendation than any search result.

The questions to ask on the phone

Run through a short checklist before you agree to anything. Ask how soon they can attend and what the total attendance cost will be. Ask whether they hold public liability insurance and whether they can send evidence of it. Ask whether they carry common parts such as washers, isolation valves and flexible connectors, or whether a temporary fix will be needed until parts can be sourced. Ask who exactly will attend and confirm the business name. A competent engineer answers all of this without hesitation.

When they arrive, check that the name on the ID card, the invoice and the van all match. No one should start chargeable work before you have a written price and a named business.

Before they leave: paperwork and protection

Ask for a proper invoice showing the business name, address and contact details, plus a VAT number if they are registered. It should itemise labour and parts separately. Any guarantee on the work or the parts should be written down with its duration. If a boiler has been serviced or repaired, ask for the service record to be completed. Keep any replaced parts if the fault is disputed, and photograph the work before and after.

• Check your home insurance for home emergency cover — many policies include a 24-hour helpline with approved contractors, which is far cheaper than an unknown call-out
• If you rent, repairs are the landlord's responsibility; report the problem in writing and keep a copy
• If you are a landlord, your gas safety duties apply regardless of how urgent the repair feels

One last thing: be the customer tradespeople remember kindly. Clear description of the fault, easy access, prompt payment and a straightforward manner go a long way. When your pipes burst at eleven o'clock at night, being the person a good plumber is happy to turn out for is worth more than any discount.