How to start a plumbing business in the UK

Starting a plumbing business takes more than a van and a set of grips. Work through this list in order:

1. 1Qualifications and experience: an NVQ Level 2 or 3 in plumbing and heating, and time on the tools with an experienced plumber.
2. 2Registrations: Gas Safe if you'll do any gas work, and an approved contractor scheme so you can join WaterSafe.
3. 3A business structure: sole trader or limited company.
4. 4HMRC: Self Assessment as a sole trader, plus VAT and the Construction Industry Scheme if they apply.
5. 5Insurance: public liability, cover for your tools and van, and employers' liability once you hire.
6. 6Prices: an hourly rate, a day rate and fixed prices built from your costs.
7. 7A way to win work and answer every enquiry, even when you're under a sink.

Each step is covered below. None of it is hard, but skipping one, especially Gas Safe or insurance, can end a new business quickly.

There's no single licence to call yourself a plumber in the UK, but customers, insurers and trade schemes all expect proof that you're competent. The usual route is a City & Guilds NVQ:

• The Level 2 NVQ Diploma in Plumbing and Heating (6189-11), designed for anyone who wants to become a plumber or domestic heating engineer.
• The Level 3 NVQ Diploma in Domestic Plumbing and Heating, for people who've finished Level 2 or already have the experience. City & Guilds also offers Level 3 pathways that cover gas-fired water and central heating appliances.

WaterSafe, the national register of approved plumbers, asks for a plumbing-related NVQ Level 2 in Mechanical Engineering Services plus a Water Fittings Regulations qualification it recognises, and £2 million of public liability insurance. Membership of WaterSafe is free for most qualified members of its four approved contractor schemes, run by APHC, CIPHE, SNIPEF and WIAPS. WaterSafe describes itself as a one-stop place for consumers to find approved plumbers, so being listed helps new customers trust you.

If you're qualified but new to running jobs alone, a few months subcontracting for an established firm teaches you pricing, customers and paperwork before your own name is on the van.

Yes, if you'll do any work on gas. GOV.UK says you need to be on the Gas Safe Register to work on gas fittings or gas storage vessels in the UK. That includes fitting, servicing or moving a boiler, a gas hob or a gas fire. GOV.UK is clear that you must be registered to do gas work legally.

Gas Safe Register sets the registration fees and publishes them on its own website, so check the current list before you budget.

Gas Safe brings regular work too. Landlords must have a gas safety check done every year on each gas appliance and flue they provide, and only a Gas Safe registered engineer can do it. A list of landlord customers with annual reminders is steady income for a new business.

If you don't do gas, say so clearly on your website and Google profile, and pass gas enquiries to a registered engineer you trust. They'll often send water work back your way.

To become a self-employed plumber, you choose a business structure, tell HMRC and start trading. Most plumbers begin as sole traders. Here's how the two main options compare:

Most people starting out as a plumber begin as a sole trader, because it's the simplest structure to set up and run. You can start trading straight away and you keep the profits after tax. The catch is that a sole trader has unlimited liability: you're personally responsible for all of the business's debts.

A limited company is legally separate from you. GOV.UK explains that company owners are responsible for business debts only up to the value of their investment, but directors take on more paperwork: company records, a confirmation statement, annual accounts and a Corporation Tax return. Registering a company with Companies House costs £100 online, and it's usually done within 24 hours.

GOV.UK also says it's usually easier to move from sole trader to limited company than the other way round. Plenty of trades start as sole traders and talk to an accountant about incorporating once profits grow.

As a sole trader you can start working before you tell HMRC, but you must register for Self Assessment once you earn more than £1,000 in a tax year. The deadline is 5 October after the end of the tax year you started in. HMRC's current page gives 5 October 2026 for the tax year that ended on 5 April 2026, so if you start trading in the 2026 to 2027 tax year, register by 5 October 2027. Register late and you could get a penalty.

Then keep these dates and thresholds in view:

• Making Tax Digital for Income Tax: sole traders with qualifying income over £50,000 should have started from 6 April 2026. The threshold drops to £30,000 from 6 April 2027 and £20,000 from 6 April 2028, so a new business may need digital records and quarterly updates sooner than you'd expect.
• VAT: you must register if your taxable turnover for the last 12 months goes over £90,000, or you expect it to in the next 30 days. You can register earlier if you want to reclaim VAT on the van and tools.
• Records: keep every receipt, invoice and mileage note from the first day. It makes the tax return quicker and the business easier to price.

Plumbers often work for builders and developers, so check the Construction Industry Scheme. It covers construction work including installing systems for heating, lighting, power, water and ventilation. If you work for a contractor and you're registered for CIS, they deduct 20% from your payments and pass it to HMRC as an advance on your tax. If you're not registered, they must deduct 30%. Register before your first subcontract job.

Three covers matter most:

• Public liability insurance: pays out if you damage a customer's property or injure someone. It isn't a legal requirement, but a flood from a failed joint can cost thousands, WaterSafe asks for £2 million of cover and many builders and agents won't use you without it.
• Tools and van cover: plumbing kit is expensive and vans are a target for thieves. Check the policy covers tools left in the van overnight.
• Employers' liability insurance: a legal requirement from the day you take someone on. The Health and Safety Executive calls it compulsory insurance, and it must cover at least £5 million.

For a sense of price, Simply Business says 10% of plumbing, heating and ventilation contractors paid £259.97 or less a year for up to £2 million of public liability cover between January and June 2026. That's the cheapest tenth of its customers, not an average, so get quotes with your own details.

It depends mostly on the van and whether you already own your tools. These are published prices, checked on 22 October 2026:

Sources: Ford Transit Custom, Simply Business plumbers insurance, Companies House registration via GOV.UK and WaterSafe.

Example only: a sole trader buying the van above new and the insurance figure above would spend £35,409.97 before tools, gas registration and VAT on the van. Many new plumbers start with a used van they already own, which brings that number down a long way.

New plumbers often price low to win work, then find they're busy but not earning. Build your rate from a year of costs, the pay you want and the hours you can actually bill, then check it against the market.

Our guide on what to charge as a plumber walks through the sum with a worked example, tax and National Insurance, Gas Safe costs, emergency rates and 2026 market prices. Set an out-of-hours rate before the first 10pm call, not during it. Our guide to out-of-hours plumber calls covers how.

Your first customers usually come from people who already know you, then from Google. In order:

1. 1Tell everyone you know, and the builders, kitchen fitters and bathroom fitters you've worked with, that you're taking on work.
2. 2Set up a free Google Business Profile. Google advises you to keep it complete and accurate, respond to reviews and add photos. If you work from home, hide your address and set a service area.
3. 3Ask every happy customer for a Google review straight after the job. Our guide on how plumbers can get more Google reviews has the review link and what Google bans.
4. 4Visit local letting agents and ask who handles maintenance. Landlords need repairs all year and, if you're Gas Safe, annual safety checks.
5. 5Put your name and number on the van. It's a cheap advert that works every day you're parked outside a job.

Lead sites can fill gaps in a quiet first month, but judge them by the cost of each job you win. Our guide on how to get more plumbing jobs compares what Checkatrade and MyBuilder charge.

When you work alone, every call comes in while you're on a job, driving or with a customer. In a 2026 BT survey, 75% of UK adults said they'd give a business three call attempts before giving up on it. A new plumber doesn't have a name yet, so a missed first call is often a customer you never hear from again.

You have a few options:

• Voicemail. It's free, but many callers won't leave a message and will ring the next number on the list.
• Calling back between jobs. It works when you're quiet, and falls apart in a busy week.
• A family member or a part-time receptionist. Reliable, but it costs wages and only covers set hours.
• An answering service or an AI receptionist that answers in your business name and sends you the details.

Put your own numbers into our missed call calculator to see what missed calls could cost each week. If you'd like a receptionist that takes the call for you, see how Ringzel works as an AI receptionist for plumbers. Our guide comparing plumber answering services sets out what each option costs.

Growth for a plumbing business usually means one of three things: better-paid work, repeat customers or more pairs of hands. Before you hire, check you're getting the most from the hours you already work. Raise prices if you win nearly every quote, keep a list of past customers for service reminders, and add work that repeats, such as landlord gas safety checks and boiler servicing.

Taking on your first employee changes your legal duties. Before the first payday:

1. 1Register as an employer with HMRC. You must do it before the first payday, and not more than 2 months before you start paying people, then run payroll through PAYE.
2. 2Get employers' liability insurance from the day they start. The Health and Safety Executive says it's compulsory insurance, required by law. GOV.UK says it must cover at least £5 million, and you can be fined £2,500 for every day you're not properly insured. There are narrow exceptions, such as only employing close family.
3. 3Set up a workplace pension. You must enrol staff aged 22 to State Pension age who earn at least £10,000 a year and normally work in the UK, and pay at least 3% of their qualifying earnings.
4. 4Pay at least the minimum wage. From April 2026 the National Living Wage for workers aged 21 and over is £12.71 an hour.

An apprentice can be a cheaper way to build a team you've trained yourself. In England an apprentice must be paid at least the apprentice rate, which is £8 an hour from April 2026 for apprentices under 19 or in their first year. If you don't pay the apprenticeship levy, which most small firms don't, the government says it pays 100% of the training and assessment cost for apprentices aged 16 to 24, up to the funding band maximum. You must give them time off for training and work alongside experienced staff, so take one on when there's steady work and someone with time to teach. Scotland, Wales and Northern Ireland run their own schemes.