Choosing the right plumber for your job

This guide explains how to choose a plumbing firm, including, without embarrassment, how to choose against us. The trade in this country has no single licence: anyone may legally trade as a plumber for water work. For gas the law is different, because the Gas Safe Register exists; for everything else, only you will do the checking. The good news is that the checking is quick, everything is checkable online, and the firms worth using expect to be checked.

The register that is the law, and the one that is the standard

If your job touches gas, boiler, cooker, fire, any flue, the person must be on the Gas Safe Register, by law, and registered for the specific work category, not just registered at all. Every registered engineer carries an ID card with a licence number; the card says what they are qualified for, and the number can be checked on the Gas Safe Register. Ask to see the card, then check the number anyway, cards exist in fake too.

For water work, the voluntary standard is WaterSafe, the register that pulls together approved plumbers from the water scheme membership; approved contractors can carry out certain work without prior notification to water suppliers, and they issue Certificates of Compliance. WaterSafe is not a legal requirement, but on a cold call, it is the difference between a track record and a claim of one.

The paperwork that protects both sides

A written quote, itemised, parts, labour, hours or day rate, and what is excluded, not a figure remembered from a phone call. A quote is a fixed offer you can hold; an "estimate" is a guess you subsidise when reality arrives, and the Consumer Rights Act 2015 entitles you to services carried out with reasonable care and skill regardless of which word was used, but the argument goes better with paper. Public liability insurance, askable in one sentence ("what's your cover, and are you insured for work in my home?"), answerable in one more. And for anything beyond a morning's work: stages, agreed in writing, so the money follows the work rather than preceding it.

Then the small print of reputation: reviews that mention the same job returning over months, not just the friendly arrival; a landline or an address that exists on an invoice; and a VAT invoice or receipt without asking twice. None of this is distrustful, it is the paperwork of a functioning trade.

The payment habits that keep a job small

The classic shape of a bad job is not bad pipework, it is bad money. Large deposits up front for parts that a merchant could supply on the firm's own account; cash-only, receipt-less discounts; the price that changes on the doorstep because the fault "turned out to be bigger"; and the engineer who cannot produce a Gas Safe number for the gas work they just quoted you. Any of these on day one predicts year two. Pay on stages you can see completed, keep the sheet of what was done, and keep the parts boxes for anything with a warranty, the warranty claim needs the serial number, and the serial number lives on the box and the invoice, not in memory.

How to choose, honestly

For a job like ours: one firm recommended by a neighbour who had the same fault before, a repeat visit is the review that matters; registers checked; a written itemised quote from at least two firms for anything over a day's work; and whoever asked the most questions about access, isolation, and what happens if the fault is bigger than it looks, the engineer who describes the downside unprompted has seen it before.

What this guide does not cover

We have not covered disputes and small claims after a job has gone wrong, Citizens Advice run that process, and their consumer pages are the right starting point, with your dated paperwork as the evidence. Nor the specific protections when hiring for a rental property, which sit with landlord certificates and their own deadlines. And we have deliberately not compared day rates in print: prices move, and a cheap rate for the wrong job is the most expensive thing in this guide.