Is Your Plumber Actually Licensed? The Unlicensed-Work Trap in NSW, and Why It Matters More Than You Think

Nearly no one ever checks if a plumber is licensed; it only takes 90 seconds. However, if you have unlicensed plumbing work done, you can lose your insurance, compromise your warranty, end up with serious safety issues, and sabotage future home sales. All of this, and the easy solution that keeps you safe.

There is one thing that trumps all other hiring tips for plumbers, it is something people are most likely to overlook: you should make sure your plumber is licensed. It sounds obvious. It sounds like box-ticking. Yet unlicensed and improperly licensed work is a real issue, the effects are quite severe and are not appreciated by most homeowners, and the check that prevents it requires about 90 seconds and costs nothing. The simplicity of the check and the consequences of not taking it are so big that it needs its own guide.

This isn’t scaremongering. It’s a no-nonsense explanation of the rationale behind plumbing licensing and what can go wrong if someone’s not licensed to do plumbing, how the plumbing licensing system in NSW works, and, most importantly, how to verify whether any plumber in question is licensed to do the work. Know this one thing and you have saved yourself from the most disastrous plumber-hiring error. If you skip it, a claim, a house sale or a safety incident could be the moment it catches up with you.

Why plumbing is licensed at all

Begin with the why, because it’s the why that accounts for everything that comes after. Plumbing, draining and gasfitting are licensed trades in NSW because of their concrete, serious nature, not because of any bureaucratic necessity.

The less obvious side of plumbing is that it protects health and safety. It maintains clean drinking water and prevents it from becoming contaminated by wastewater; incorrect work can result in contamination that leads to illness. It removes sewage and wastewater safely; done improperly, it creates health problems. If gas work is improperly conducted, it may result in explosions and carbon monoxide poisoning. Even “regular” plumbing that is just poorly installed results in water damage that can lead to significant monetary and structural damage. Licensing is a mechanism for society to make sure that people who do this consequential work are trained, competent, accountable and insured, they know what they’re doing and answer for it if they get it wrong.

So a plumber’s licence isn’t something that they just have by chance, it’s a licence proving they are trained and responsible for work that can truly impact your health, safety and property. If the plumber isn’t licensed, there’s no assurance the person doing the work is any good. You are relying upon a person without any proven competence and without any accountability, and hoping that everything goes well. Sometimes it does. When it doesn’t, you find out exactly why the licence exists.

🏛️  Licensing is not red tape: plumbing, draining and gasfitting are licensed under the Home Building Act 1989 because they safeguard drinking water quality, they ensure sewage is safely removed and, for gas, prevent explosions and poisoning. Licences validate training, competence, accountability and insurance for work that truly impacts your family’s health and safety. All of it is lost if the work isn’t licensed.

What actually goes wrong with unlicensed work

This is the stuff you don’t want to read until you already have a plumbing problem, but these are the real, tangible repercussions of getting plumbing done without a licence, a few of which won’t show up until the worst possible time.

Your insurance can be voided

This is the big one, and the one people least anticipate. Home and contents insurance normally assumes that work was done by appropriately licensed tradespeople. When you claim for damage (flood, burst, water damage) caused by unlicensed work, your insurer might investigate and unlicensed work could threaten your claim. You may end up with a massive repair bill without insurance simply because you went with someone that isn’t a licensed plumber. The saving is small, the exposure is huge. That alone is enough to never want to risk unlicensed work.

You have no real warranty or recourse

With licensed work there is accountability, the licensed plumber is held accountable for their work, there are statutory warranties, and if things go wrong, there is a regulator (NSW Fair Trading) that you can go to. None of this is available with unlicensed work. If it goes wrong, you have almost no meaningful way to pursue someone who was never licensed to do it in the first place. They fail to do the right thing, and you’re the one left to pay for it.

Safety hazards

The work may not be up to the code that keeps plumbing safe, opening the door to possible contamination of water systems, blocked drains and, in the case of gas, to the potential danger of explosion and CO. These aren’t hypothetical; these are the perils the standards and licensing are designed to guard against.

Problems when you sell

Selling your home can bite back when it isn’t sale-ready because of unlicensed or uncertified work. Buyers, inspectors and conveyancers may enquire about the compliance of plumbing and gas work, and unpermitted or uncertified work can add to the complexity of a sale, or even be a reason for a sale to fail, or force repairs at the worst possible time. Things you’d hoped were “finished” years ago come back at you as a problem when you least expect them.

It can simply be illegal

It is illegal to do licensed plumbing without a licence in NSW. If you hire a person who isn’t licensed to do the job, you’ll be in the same situation as if you had illegal work performed on your home, and all the consequences that come with that.

That’s the insidious nature of unlicensed work: the voided insurance claim, the lost sale, the safety issue, the consequences often stay hidden for years and come to light when no one’s paying attention anymore. The reason people skip the check is that it doesn’t feel like a danger on the day. But it’s real, and it’s waiting.

How licensing works in NSW

If you know the system, it’s easy to check. Plumbing, draining and gasfitting work in NSW is regulated and licensed by NSW Fair Trading. Because the categories are separate, licences determine what a person or business can actually do (this matters). The endorsements are independent and a person may be licensed for general plumbing but not as a gasfitter. So “licensed” is not just a yes or no, it’s licensed for what.

There are also various types of licences granted depending on the level of authority, a fully licensed tradesperson, who can work unsupervised and contract directly, versus lower-category licences that require the holder’s work to be supervised. As a property owner, what matters is that the person or company performing your work has an up-to-date and relevant licence for the work they are undertaking, and that you can check this for yourself.

The system is designed for public verification so consumers can protect themselves. NSW Fair Trading keeps a public register of licence holders which is available for free search at any time. This is the most powerful thing in this entire guide, and it’s the thing that makes “I hope they are licensed” into “I know they are licensed.”

How to check a plumber's licence in ninety seconds

This is the real, hands-on process, the habit you want to have, every time and for every plumber, before starting work.

Step 1: get the licence number.  Ask the plumber for their licence number, or look it up on their website, quote, invoice or van, a professional plumber will have it, and it’s part of their business identity. If a plumber refuses to provide a licence number, they’ve essentially answered the question of whether or not to hire them.

Step 2: check the NSW Fair Trading register.  Use NSW Fair Trading’s licence check tool on the NSW Fair Trading website. Search can be done by licence number or by name or business. It’s free, public and takes moments.

Step 3: verify the details.  Ensure the licence is not expired or suspended, ensure that the work you are looking to undertake is covered by the licence (from general plumbing, roof plumbing and pipe repairs to gas fitting if gas is in the works), and ensure the name matches who you’re dealing with. This is where you catch the plumber who’s licensed for general work but not the gas work they’re about to do, which can make all the difference.

Step 4: check insurance too.  While you’re asking, check public liability insurance too, the cover that protects you if the plumber damages your property. The whole foundation is licence plus insurance.

That’s it. Four simple steps, 90 seconds, no money, and you’ve taken the single most important risk out of hiring a plumber. Once you do it, it’ll become second nature and you’ll never let unqualified hands do the job again.

✅  The ninety-second habit: get the licence number, check the free NSW Fair Trading public register, ensure it’s current and is for the particular work (including gasfitting if appropriate), and check insurance. It takes away the main danger in the entire process and it takes four steps, all for free. There’s no better 90 seconds to invest in home maintenance.

The excuses that get people to skip the check, and why they're wrong

There are obvious reasons why people avoid verifying licences, and each of these falls apart when examined. It is worth mentioning them, because you can beat the excuse by recognising it.

“Word of mouth is the best recommendation.”  Recommendations are a good start but are not proof, the person recommending them might not have checked either, and licences can expire. A recommendation puts a person on your shortlist, the licence check keeps them there. Do both.

“It’s a simple job.”  Small things done wrong still affect insurance, still cause damage, still matter. And “small” jobs often require more than meets the eye. Licensing is important no matter how small the job is.

“They seem professional and confident.”  Seeming professional is not the same as being licensed. A good van and a confident attitude are no substitute for credentials. The register verifies credentials, impressions do not.

“It’s awkward to ask.”  It isn’t, and a real plumber expects it and welcomes it, because they’re proud of their licence. The only person who finds the question awkward is the plumber who can’t answer it. Not asking is a risk you shouldn’t accept; asking is a moment of mild discomfort.

“The unlicensed quote is too cheap to miss.”  This is the worst excuse. The saving is negligible and the exposure, voided insurance, no recourse, safety risk, sale problems, is devastating. There’s no version of this maths that works out in your favour.

Home warranty insurance: the extra protection on bigger jobs

There is another level of protection to be aware of, it only applies to larger jobs and is another thing unlicensed operators deny you. Home building compensation cover (previously home warranty insurance) is a requirement for residential building work in New South Wales carried out above a specified value (this can be a significant amount of plumbing work). This is a safety measure which helps the homeowner if the tradesperson is unable to finish the project or rectify defects (such as their death, disappearance or insolvency) and leaves the homeowner with incomplete or faulty work.

As a homeowner, the most important thing to know is that this protection only exists within the legitimate, licensed system. Only a licensed contractor who is doing qualifying work will arrange for the appropriate cover; an unlicensed operator working off the books will not arrange any cover. For larger jobs, hiring a licensed contractor not only ensures that you receive competent services, but that you are also connected to a compensation system that will safeguard you in the event of a problem with the contractor. So it’s one more thing the “cheap” unlicensed job silently takes away: not just the statutory warranty and the insurance validity, but this backstop too. On smaller everyday jobs, the threshold may not be met, but when it comes to anything significant, it’s a good idea to consult a contractor about it, and it’s another reason why the licensed path is the only logical one to take on any job of real magnitude.

🛡️  A further layer offered by the licensed system only: NSW requires home building compensation cover on larger residential works, once they exceed a certain threshold, a safeguard if the contractor cannot complete the work or correct it. It is associated with the licensed system, none is provided by unlicensed operators. That is one more reason that for any significant project, it’s best to hire a licensed professional.

What to do if you suspect work was done unlicensed

Maybe you are reading this after the fact: the plumber did work for you and you’re wondering whether they were actually licensed. Don’t worry, but take a few sensible steps, as dealing with it now is better than being caught unawares by it later.

First, put together all documentation, including invoices, quotes, any paperwork, the business name and any licence number they provided, and look up their number on the NSW Fair Trading register to determine if they had a licence to do the work. They may well have been licensed all along, in which case you can breathe easy. It’s more concerning if they won’t give a number, or none can be found.

Secondly, if the work was undertaken without a licence, have it checked by a licensed plumber to determine if it was completed correctly and safely, especially for gas work, or for work done out of view or anything safety-related. It is better to know now than to find out through a failure, claim or house sale. A licensed plumber will be able to determine if the work is safe, needs improvement or should be properly certified.

Thirdly, maintain records and think about certification. Having the work properly documented is not always possible, but if it is, a proper assessment and, if appropriate, documentation of the work by a licensed professional may protect you at the time of sale and under insurance. If you’ve had a really bad time with an unlicensed operator, NSW Fair Trading is who to take it to, it’s not something they take lightly, both for your sake and for others dealing with the same operator.

If you’re caught in this position, don’t beat yourself up, almost everyone has skipped the ninety-second check at some point; just make the ninety-second check a habit from now on. It is the most inexpensive insurance you can ever find, and after it becomes routine this kind of risk more or less disappears from your life.

Licensed is the floor, not the ceiling

An important framing to end with: licensing is just the beginning. A licence is a guarantee that a plumber is legally qualified to perform plumbing services, whether that’s toilet repairs, hot water heaters, water tank cleaning or an emergency plumber callout, and that they are essentially accountable, but it doesn’t guarantee that they are great. There are plenty of merely so-so plumbers out there, and the other signs of quality, such as workmanship, warranty, honesty, communication, and experience are still as important as ever in telling a good plumber from an average one.

However, before all that can happen, one thing everyone has to do is cross the licensing hurdle. No matter how good the unlicensed plumber looks, how friendly or cheap they may be, the licence carries with it all the accountability, insurance and legal backing that makes the rest of it worth anything. So play it safe and think of the licence check as the gate. Everyone has to pass it to be considered at all. Then you choose on quality among the licensed. Don’t assume passing the gate makes someone the best, and don’t skip the gate just because someone seems the best. Licensed and good, at all times.

It all boils down to a single habit, and one it’s easy to learn, before allowing any plumber to do anything in your house, check their licence on the free NSW Fair Trading register and confirm their insurance. You’ll have protected your insurance policy, your warranty, your family’s safety, and even your future home sale, avoiding the most critical error a homeowner can make when hiring a tradesperson, and you’ll have done it in 90 seconds, at no cost. Everyone means to do it. Almost nobody does. Do it, no question, because the consequences of not checking are exactly the kind you never want to experience, and ninety seconds is a small price to avoid them.

Not only is this a check that protects you, it’s a check that protects others as well. The next time a homeowner demands a licence and rejects an unlicensed operator, the market shifts a little more in favour of the legitimate tradespeople who have taken the time to get licensed, insured and abide by the rules, and against the cowboys who skimp on the licence, the insurance, and the rules. The licensed plumber quoting a fair price is competing against operators who look cheaper only because they’ve cut the licensing, compliance and insurance that would otherwise protect you. Choosing to verify and hire licensed means you are not only safeguarding your own property; you are also supporting the good side of the trade and the good side of the plumbing industry. It’s a little action that has a big impact, and it’s something you’ll be doing anyway in a minute.