Do self-employed plumbers need insurance?
What insurance a self-employed plumber actually needs in the UK, which cover is legally required and which only feels like it is, what it costs, and the exclusions that catch people out.
Quick answer
Public liability is not required by statute, but it is required by most commercial contracts and by the trade bodies. Gas work legally requires Gas Safe registration, which itself expects insurance. What matters more is the cover mix: financial loss / defective workmanship is the one most plumbers miss, and employers' liability becomes a hard legal requirement of at least £5m the moment you employ anyone. Roughly £100-£300 a year for £2m public liability; Gas Safe registered engineers and commercial work sit higher.
Insurance for a plumber: what you need
| Cover | Status | What it does |
|---|---|---|
| Public liability | Essential | £2m-£5m. £1m is genuinely too little for a trade whose main risk is escape of water. |
| Financial loss / defective workmanship | Recommended | Covers the cost of putting your own faulty work right, which public liability does not. |
| Tools cover | Strongly recommended | Van break-ins are the most common non-liability claim in the trades. |
| Professional indemnity | Recommended | Relevant if you specify systems, size boilers or issue certificates. |
| Employers' liability | Legally required if you employ | £5m minimum by law, including for an apprentice or a mate you pay cash. |
Step-by-step
- 1
Know the legal position first
Public liability is not required by statute, but it is required by most commercial contracts and by the trade bodies. Gas work legally requires Gas Safe registration, which itself expects insurance. It is worth being precise about this, because the trade forums are full of people who believe public liability is compulsory for everyone and people who believe it is never needed. Neither is right. The only insurance that is compulsory across the board is employers' liability, which becomes a legal requirement the moment you employ anyone.
- 2
Understand what actually goes wrong for a plumber
Water damage claims are among the largest in the trades. A failed joint in an upstairs flat can destroy the ceilings, floors and possessions of every property below it, and the bill runs well past what a £1m policy comfortably absorbs.
- 3
Get the cover mix right, not just the headline policy
The table above is the important part. Buying 'public liability' and assuming you are covered is how most claims get declined in this trade — the specific extensions are what respond to the things that actually happen. Read what your policy names, and check the exclusions rather than the marketing.
- 4
Employers' liability the moment you take on any help
This is the one genuine legal obligation. Employers' Liability (Compulsory Insurance) Act 1969 requires at least £5m of cover from the day you employ anyone — full-time, part-time, casual, family, paid in cash, it makes no difference. The penalty is up to £2,500 for every day you are uninsured, and a further fine for not displaying the certificate. If you use subcontractors, check whether your insurer treats them as employees; many do when you direct their work.
- 5
Tell your other insurers what you're doing
Two policies are routinely invalidated by not mentioning the business. If you work from home, your home insurer needs to know — undisclosed business use can void your buildings and contents cover entirely, including for unrelated claims. If you drive to jobs, your motor policy needs business use added; social, domestic and pleasure does not cover travelling between clients. Both changes are usually cheap. Not making them is not.
- 6
Put your cover on your website and quotes
Being insured is a selling point and most plumbers waste it. A line on your site stating your cover level, alongside any qualifications and checks you hold, answers a question customers are already asking silently and separates you from whoever quoted before you. Commercial clients will ask for the certificate anyway — make it easy to find.
Tips & best practices
- ▸Escape of water in a multi-occupancy building is the claim that justifies £5m rather than £1m cover. The damage is not confined to the property you worked in.
- ▸Gas work requires Gas Safe registration by law. Working on gas without it is a criminal offence and voids any policy you hold.
- ▸Public liability covers the damage your mistake caused, not the cost of redoing the work. Those need separate cover and plumbers routinely conflate them.
- ▸Check your policy's exclusions before you check its price — the cheapest cover is usually cheap because of what it leaves out.
- ▸Buying through a trade association or professional body is very often cheaper than buying direct, and the membership frequently pays for itself.
Common questions
How much public liability insurance does a plumber need?
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£2m is a realistic minimum and £5m is sensible if you work in flats, commercial premises or anywhere with occupied floors below you. The reason is escape of water: one failed joint above a ground-floor property can cause damage across multiple flats, and the total easily exceeds £1m once contents and alternative accommodation are counted.
Do I need Gas Safe registration as well as insurance?
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If you work on gas appliances or pipework, Gas Safe registration is a legal requirement, entirely separate from insurance. Working on gas unregistered is a criminal offence and would also void your insurance, leaving you exposed personally to any resulting claim.
Does my insurance pay to redo work I got wrong?
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Not under public liability, which covers damage to third-party property and people. If a joint you fitted fails, public liability covers the water damage to the customer's home but not the cost of returning to fix the joint. Cover for that is 'defective workmanship' or 'financial loss' and is usually a separate add-on.
How much does plumber insurance cost?
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Roughly £100-£300 a year for £2m public liability; Gas Safe registered engineers and commercial work sit higher. Price varies with your cover limit, your claims history and exactly what work you declare, so compare on what is actually covered rather than on the headline figure.
Is any insurance legally required if I'm self-employed?
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Only employers' liability, and only once you employ someone. That is a hard legal requirement — a minimum of £5m from the first day, with penalties of up to £2,500 for each day you are uninsured. Everything else, including public liability, is a commercial decision rather than a legal one, though in practice clients and contracts often make it unavoidable.
Do I need insurance if I only work part-time or as a side business?
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Yes. Liability attaches to the work, not to how much of it you do or what you earn from it. A part-time trader who causes an injury faces exactly the same claim as a full-time one, and 'it was only a weekend job' is not a defence. Part-time cover is often cheaper, so tell your insurer your actual turnover.