How to become a plumber in the UK

6 minute read · 2026-08-28

Plumbing is a trade with two ceilings. The first is reached quickly, when you can fit a bathroom and clear a blockage. The second, gas and heating, takes longer and is where the money is. Knowing the difference before you enrol on anything will save you time and several thousand pounds.

What plumbers actually do

Domestic maintenance is the bread and butter: leaks, burst pipes, taps, toilets, blocked wastes, cylinders, radiators and thermostats. Installation work is bathrooms, kitchens, heating systems and full first and second fix on new builds. Commercial plumbing shifts to larger pipework, plant rooms, soil stacks and pressure testing, often on programme with other trades. Heating engineers add boiler servicing, breakdowns, system flushing and, increasingly, heat pumps and low temperature systems.

Whichever branch you are in, a large slice of the job is diagnosis and customer handling. You are often in someone's home on a bad day for them, explaining why the repair costs what it does.

Qualifications, tickets and roughly what they cost

The recognised route is a Level 2 Diploma in Plumbing and Domestic Heating followed by Level 3, ideally through an apprenticeship of about three to four years, which pays you while you learn and builds the NVQ portfolio of real site work that classroom courses cannot. Adult learners can study at college part time, but you still need an employer or a steady stream of supervised work to complete the portfolio.

Gas is a separate qualification and the one people get wrong. You cannot work on gas by taking a weekend course. The route is a managed learning programme, where you build a portfolio of supervised gas work under a registered engineer, then sit ACS assessments: the CCN1 core domestic unit plus appliance units such as CENWAT for boilers and water heaters, CKR1 for cookers and HTR1 for fires. ACS assessments are commonly quoted at £700 to £1,400 depending on how many units you take, and they must be renewed every five years. On top of that comes annual registration with the Gas Safe Register, whose fees are published on its own site and change from year to year.

Other tickets worth having:

G3 unvented hot water, usually two days and commonly £300 to £450, renewable every five years.
Water regulations and Legionella awareness, short courses often required on commercial work.
OFTEC for oil fired appliances, and heat pump or low carbon qualifications for retrofit work.
A CSCS card if you want to work on construction sites.

Realistic pay

Apprentices start on the apprentice rate, which is reviewed annually and published on GOV.UK. A qualified plumber employed by a maintenance or housing contractor is typically advertised at £32,000 to £42,000 with a van. Gas safe heating engineers are commonly advertised at £38,000 to £50,000, with service and breakdown roles adding standby and call out payments. Self employed day rates are commonly quoted at £180 to £300 depending on region and the work involved, before you deduct van, stock, tools, insurance, registration and the hours you spend quoting for jobs you do not win.

The realities of the trade

You will work in cold lofts, under floors and in the confined space behind a bath. Some jobs are genuinely unpleasant, because drainage is part of the work. On call rotas mean being woken at two in the morning by a burst pipe, and winter is your busiest season precisely when the weather is worst. Knees and back take a beating over the years. Parking and access in city centres cost you time nobody pays for. Set against that, it is a trade with steady demand and one where competence is quickly recognised.

Getting the first job and moving up

Start by looking for an apprenticeship, including with local authorities, housing associations and facilities contractors, which train adults as well as school leavers. If that is not available, a plumber's mate or improver position with a small firm gets you on the tools while you study. Approach firms directly with a short, specific CV and a note about your availability. If you have no trade history yet, our guide to a CV with no experience shows what to include instead.

Progression usually means gas, then commercial or renewables, then supervisor, estimator or running your own firm. Many plumbers combine an employed role for security with weekend work of their own.

Next step: search current plumbing and heating vacancies for firms offering funded gas training, and read our candidate FAQ if you want to know how applications on this site reach employers.