How to become a self-employed plumber in the UK

1. Get trained and qualified

There is no single licence to call yourself a plumber in the UK, but customers, insurers and suppliers will expect recognised training — and you need real competence to work safely on water and heating systems. The common routes are:

• An apprenticeship — earn while you learn with an employer, usually over several years. See become an apprentice on gov.uk.
• College courses — Level 2 and Level 3 qualifications in plumbing and domestic heating, often combined with work placements
• Working under an experienced plumber — many people build their skills and portfolio this way before going solo

The National Careers Service plumber profile sets out the current routes and qualifications.

2. Register with Gas Safe if you will do gas work

This is a legal requirement, not a nice-to-have. By law, anyone working on gas appliances, boilers or gas pipework for payment must be on the Gas Safe Register. That includes installing, servicing, repairing and moving gas fittings.

To register you need to show competence in the specific types of gas work you will do — usually through recognised gas assessments — and then register your business. Your Gas Safe ID card lists exactly what you are qualified to work on. Doing gas work you are not registered for is a criminal offence.

If you are not Gas Safe registered, stick to water-only plumbing — taps, toilets, waste pipes, leaks — and refer gas jobs to a registered engineer.

3. Know the water regulations

In England and Wales, plumbing work must comply with the Water Supply (Water Fittings) Regulations 1999, which exist to stop the public water supply being contaminated or wasted. Some work must be notified to the local water company before you start.

Some jobs also fall under the Building Regulations — for example installing an unvented hot water cylinder, which should only be done by someone with the right qualification. Scotland and Northern Ireland have their own versions of these rules, so check what applies where you work.

4. Register as self-employed with HMRC

Most plumbers start as a sole trader. You must register for Self Assessment by 5 October after the end of the tax year in which you started, then file a return each year. Our guide on how to register as self-employed walks through it.

Keep receipts for tools, van costs, materials and insurance — these are usually allowable expenses that reduce your tax bill. See self-employed tax in the UK.

5. Get insurance

Public liability insurance is not a legal requirement for sole traders, but a single leak can cause thousands of pounds of damage, and most customers will ask whether you are covered. Plumbers also commonly consider:

• Tools insurance — vans are a target for tool theft
• Professional indemnity — if you give design advice, such as sizing a heating system
• Employers’ liability — a legal requirement once you employ anyone, including an apprentice

6. Set your prices

Plumbers charge by the hour, by a fixed call-out plus time, or by the job. Fixed prices for common jobs make you easier to book and remove the customer’s fear of an open-ended bill. Build in travel time, parts runs and the jobs that take longer than they should.

Use the earnings calculator to see what you take home from a job after fees.

7. Find work

• Referrals and repeat customers — a plumber who turns up when they say they will gets recommended
• Landlords and letting agents — steady maintenance work across several properties
• Local builders and other trades — subcontracting can fill quiet weeks
• List on Holler — it is free to list and there are no lead or subscription fees. Holler is opening area by area, and customer bookings start with cleaning, so set up your profile and reviews now.

More ideas in how to get customers without paying for leads.

Questions people ask

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