How to Check If a Plumber Is Registered
20 October 2026
How Do I Check If a Plumber Is Registered?
First, ask what work the plumber will do. There is no single compulsory UK register for ordinary plumbing jobs such as changing a tap or repairing a toilet. If the work involves gas, check the individual engineer on the Gas Safe Register and confirm their card covers that type of work. For water supply work, you can check a claimed WaterSafe Register approval. Always match the directory entry to the business and person who will attend.
“Registered plumber” can mean several different things. A tradesperson might mean Gas Safe registration, WaterSafe Register approval, membership of a professional body, or simply that their business is registered. Those claims are not interchangeable. The useful question is: registered with whom, and for this specific job?
Which registration should you check for your job?
Gas boiler, gas pipe or gas appliance: Check Gas Safe registration for the engineer who will carry out the gas work. Check their current ID card and the work categories shown on it.
Drinking-water pipework and fittings: If the plumber claims WaterSafe Register approval, search the WaterSafe Register for the business and confirm that the person doing the work is appropriately approved.
General plumbing: There is no universal compulsory plumber register. You can still verify any claimed trade-body membership, qualifications and insurance.
Do not judge registration by a badge alone. A logo on a van, advert or website does not show that membership is current or that the person at your door is approved for your job.
How do you check a plumber for gas work?
Before gas work begins, ask for the attending engineer’s Gas Safe ID card. Check the photograph and expiry date on the front. The back lists the types of gas work the engineer is qualified to do. An engineer approved for one appliance is not automatically approved for every gas appliance.
Use the Gas Safe Register’s “Check an Engineer” service to enter the licence number from the card. Compare the result with the person standing in front of you. If you booked through a company, checking the company name alone is not enough: you need to verify the engineer who will actually do the work.
If the name, photograph, dates or work categories do not match, pause the gas work and resolve the difference with the company or register. A colleague’s card does not cover another person.
How do you check WaterSafe Register approval?
WaterSafe Register is an approval scheme for plumbing businesses and appropriately qualified people working on water supply systems. Search its directory using the business name or postcode, then compare the listing with the business details you were given. Ask which approved person will carry out or oversee your job, particularly if the firm sends several staff.
WaterSafe approval is useful evidence for water fittings work, but it is not a legal requirement for every plumber. A plumber who is not listed is not automatically doing something unlawful. You should still ask about relevant training, experience, insurance and the planned work.
What about CIPHE, APHC or another trade body?
If a plumber claims membership of the Chartered Institute of Plumbing and Heating Engineering (CIPHE), the Association of Plumbing and Heating Contractors (APHC), or another scheme, search that organisation’s own current directory. Match the business or individual name and ask what the membership covers. A trade-body listing is not a substitute for Gas Safe registration when gas work is involved.
Our broader guide to finding a good plumber covers the other checks worth making alongside registration.
What details should you ask for before checking?
A short message to the company can save time: “Please send the name of the person attending, your business name, the registration or membership you are claiming, and confirmation that it covers this job.” For gas work, ask for the engineer’s Gas Safe licence number and check the ID card when they arrive.
Also ask for evidence of current public liability insurance and a written description of the work. Insurance is separate from registration, and neither one proves that a quote includes everything you expect. Check whether diagnosis, parts, making good and any additional work are included before you agree to proceed.
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Once you know the work required, use InstantCost’s plumbing calculator to describe the job and compare its scope with the quotes you receive.
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What if the plumber does not appear in a directory?
First check the spelling, trading name and whether you searched for a person when the scheme lists businesses, or the other way around. Ask the plumber which scheme holds their current record. You can contact that scheme directly if the listing is unclear.
For ordinary non-gas plumbing, absence from a voluntary directory is not proof that the plumber is unqualified. For gas work, do not let the job start until you have verified the attending engineer’s registration and relevant work categories.
What are the warning signs?
The person says their company is registered but will not identify the engineer doing the gas work.
The Gas Safe card photograph or work categories do not match the person or job.
A membership logo is shown, but the company will not say which scheme issued it.
The business details on a directory listing differ from those on the quote or invoice, with no clear explanation.
The plumber refuses to provide a written scope of work or evidence of insurance when asked.
A mismatch may have a simple explanation, such as a trading-name change, but it should be explained and verified before work begins.
Safety: check the right engineer before gas work starts
Gas work requires a properly registered and competent engineer. The UK Health and Safety Executive explains how to check an engineer’s Gas Safe registration using the licence number on their ID card and compare the result with the person attending. Check the card’s work categories as well as the name. If you cannot verify them, do not allow the gas work to proceed.
Frequently asked questions
Does every UK plumber need to be Gas Safe registered?
No. Gas Safe registration is required for gas work, not for an ordinary tap, toilet or water-pipe repair. Some plumbers hold Gas Safe registration as well, but you should check it only applies to the work you are booking.
Is WaterSafe Register the same as Gas Safe?
No. WaterSafe Register relates to approved plumbing businesses and people working on water supply systems. Gas Safe is the register to check for gas work. One approval does not replace the other.
Can I rely on the company’s registration instead of checking the person?
For gas work, check the individual engineer who attends and the categories on their ID card. For WaterSafe approval, confirm the business listing and ask which approved person will carry out or oversee the water fittings work.
Does a registered plumber still need insurance?
Ask for insurance details separately. Registration, scheme approval and insurance answer different questions. Check that the policy is current and suitable for the work being carried out in your home.
Ready to compare plumbers for the job?
Take your verified job description to InstantCost’s plumbing page. You can review the relevant service and request written quotes, then check each contractor’s credentials before booking.