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Do You Need Gas Safe Registration to Start a Plumbing Business? (UK 2026)
By Paul Lewis — time-served tradesman with over 40 years in the building services industry, former owner of his own contracting business, and five years teaching apprentices and adult learners in further education.
The short answer: only if you’ll do gas work. You can run a perfectly good plumbing business without Gas Safe registration, but the moment you touch a gas appliance, gas pipework or a flue for a customer, registration is a legal requirement. This guide explains where the line is, what registration involves, what it costs, and how to decide whether it’s right for your business.
What the law says
In Great Britain, the Gas Safety (Installation and Use) Regulations 1998 require anyone doing gas work in the course of business to be on the Gas Safe Register. Northern Ireland, the Isle of Man and Guernsey have equivalent rules that also use Gas Safe Register.
Working on gas without being registered is a criminal offence. The Health and Safety Executive prosecutes illegal gas work, and the penalties can include large fines and prison. Your insurance is also very unlikely to cover any gas work you weren’t registered to do.
Which work needs Gas Safe registration?
You need to be registered for any work on:
- Gas boilers, including installing, servicing, repairing and replacing them
- Gas fires, cookers and hobs, including disconnecting and reconnecting them
- Gas pipework in a property
- Flues and ventilation for gas appliances
- Gas meters, on the customer’s side
- LPG appliances and installations
Registration is not a single licence for everything. You are registered only for the types of appliance and work you’ve been assessed for. A plumber assessed for boilers isn’t automatically allowed to fit a gas cooker or a gas fire.
Which work doesn’t need it?
A plumbing business without Gas Safe registration can still do a wide range of work, including:
- Bathrooms, showers, toilets and basins
- Leaks, burst pipes and blocked waste pipes
- Kitchen plumbing, washing machines and dishwashers
- Water-side heating work: radiators, valves and pipework, as long as you don’t touch the boiler’s gas side, flue or combustion parts
- Unvented hot water cylinders, with the separate G3 qualification
- Outside taps, water mains and water supply work
The catch is that much of the best-paid domestic work, such as boiler installation and servicing and landlord gas safety checks, needs registration. Without it, you’ll be turning that work away or passing it to someone else.
How to get Gas Safe registered
- Get assessed. You need to pass ACS (Nationally Accredited Certification Scheme) assessments at an approved assessment centre. Everyone takes the core domestic gas safety assessment, plus an assessment for each type of appliance you’ll work on, such as boilers, cookers or gas fires.
- Register your business. Once you’ve passed, you register your business with Gas Safe Register, listing yourself and any other engineers and the types of work each is qualified for. As a sole trader, you register in your own name.
- Keep it current. Your registration must be renewed every year, and your ACS assessments must be redone every five years. If your registration lapses, you can’t legally do gas work until it’s renewed.
If you’re new to gas work, you can’t simply book an assessment. You’ll first need structured training and supervised site experience, usually through an apprenticeship or a recognised training programme for new entrants, before you’re assessed.
How much does Gas Safe registration cost?
For 2026/27, Gas Safe Register’s fees include:
- New business registration: £319.96 plus VAT (£383.95), covering your first year, one engineer and your ID card
- Annual business renewal: from around £171.58 plus VAT, depending on how you renew
- Each additional engineer: £44.40 plus VAT
On top of that, you’ll pay for your ACS assessments and any training. These vary between centres, so get quotes from two or three before booking. Remember the five-yearly reassessment too: it’s a cost to plan for.
Planning your plumbing business? How to Start Up and Run Your Own Plumbing and Heating Business by Paul Lewis has three full chapters on Gas Safe registration — what it covers, which work needs it and how to apply — plus chapters on water regulations, building regulations notification, pricing and finding customers. See inside the book →
Should you get Gas Safe registered?
It’s worth it if:
- You want to install and service boilers, which is some of the most regular and profitable domestic work
- You want landlord work, because landlords need an annual gas safety check on every property
- You want to offer customers a complete plumbing and heating service
You might hold off if:
- You prefer bathrooms, kitchens and general plumbing work
- You’re subcontracting for builders who bring in their own gas engineers
- You want to keep start-up costs as low as possible at first
Many plumbers start without gas work and add it later, once the business is established.
What if a customer asks for gas work you can’t do?
Never be tempted to “just do it”. Tell the customer it needs a Gas Safe registered engineer, and recommend one you trust. Before you advertise or arrange gas work that someone else will carry out, check Gas Safe Register’s guidance so you’re clear on who is responsible.
Frequently asked questions
Do I need Gas Safe registration to start a plumbing business? Only if you’ll do any gas work. Plumbing-only businesses don’t need it, but you must not touch gas appliances, gas pipework or flues.
Can I work on central heating without Gas Safe? You can work on the water side, such as radiators, valves and pipework, but not on the boiler’s gas supply, burner, flue or anything to do with combustion.
How long does Gas Safe registration last? Registration is renewed every year. Your ACS assessments last five years, after which you must be reassessed.
How do customers check I’m registered? They can search the Gas Safe Register website or call them, and ask to see your ID card, which shows the types of work you’re qualified for.
Is Gas Safe registration the same as an NVQ? No. NVQs and other qualifications show you’ve been trained. Gas Safe registration is the legal requirement to do gas work, and it depends on passing ACS assessments.
Read more
For everything else you need to set up, see our full guide: How to Start a Plumbing Business in the UK (2026).
Fees are 2026/27 figures and a guide only. Check current fees and requirements with Gas Safe Register before you apply.
