The phone rings at 6:30 on a Monday. It’s a client you did a bathroom renovation for three weeks ago. A compression fitting on the new basin supply line has failed overnight, and water has been running for hours. The bathroom floor is submerged, water has travelled through the wall cavity into the adjoining bedroom, the carpet is saturated, and the ceiling of the room below is sagging. The client is stressed, their insurer is already involved, and they want to know what your insurance is going to do about it.
If you’ve been plumbing for more than a few years, you’ve probably had a version of this phone call. Water damage is far and away the most common public liability claim for plumbers — by a wide margin. Insurance industry data consistently puts water-related claims at the top of both frequency and total cost charts for plumbing businesses.
Understanding exactly what your PL policy covers when it comes to water damage, what it doesn’t cover, and how to handle a claim when it lands is arguably the most important insurance knowledge a plumber can have. Here’s everything you need to know.
Why Water Damage Claims Are So Common in Plumbing
Plumbing is fundamentally about controlling water. Every joint you make, every fitting you install, every connection you tighten is a potential point of failure. The numbers are against you — not because you’re careless, but because you’re making thousands of these connections every year.
Consider a typical week for a domestic maintenance plumber: a new dishwasher connection, a replacement toilet cistern, a leaking shower repair, a hot water system change, and new pipe for a laundry renovation. Each involves multiple joints, connections, and seals. Over a year, that’s tens of thousands of individual points where water could escape. Even with a near-perfect success rate, eventually something fails.
Mains pressure in most urban areas runs between 400 and 600 kPa — enough to turn a small leak into a serious flood within hours, especially overnight or while the homeowners are at work. Modern construction materials make water damage more expensive too. Twenty years ago, a flooded room meant replacing carpet and skirting boards. Today, with engineered timber flooring, plasterboard walls, insulation, and open-plan living, the same leak causes vastly more damage.
Water damage claims by plumbers typically range from $5,000 for a small, contained leak to $150,000 plus for multi-level flooding. The average sits somewhere around $15,000 to $30,000. Your annual PL premium covers a fraction of one average claim.
What Your PL Policy Covers for Water Damage
When your plumbing work causes water damage to a third party’s property, your public liability policy should cover the resulting damage — the damage caused by the escaping water. This includes flooring, cabinetry, plasterboard walls, electrical work where water has entered power points or wiring, ceilings below, painting to make good, and temporary accommodation if the property is uninhabitable during repairs.
Your policy also covers water extraction and drying — industrial dehumidifiers, air movers, and moisture testing can run several thousand dollars before any building repairs begin. Legal costs associated with the claim are covered too, including defending a claim even if you ultimately aren’t found liable.
The damage to the homeowner’s belongings — furniture, electronics, clothing — is covered as part of the property damage claim.
Your PL policy covers consequential damage — the damage caused by the water. It does not cover the cost of fixing your own faulty work. If the fitting that failed needs to be replaced, that’s your cost, not your insurer’s.
The Gradual Damage Exclusion: What It Means for Plumbers
Most public liability policies contain an exclusion for gradual damage — damage that happens slowly over time rather than from a single, sudden, identifiable event. This matters enormously for plumbing claims.
A sudden burst pipe that floods a house in 20 minutes is clearly covered. But a slow leak from a joint you installed six months ago that gradually saturates a timber floor over several weeks? That’s where disputes happen. If a compression fitting was slightly under-tightened and has been weeping for months, causing progressive damage the homeowner only notices when the floorboards start cupping, the insurer may argue this is gradual damage and decline or limit the claim. If that same fitting suddenly blew apart and caused immediate flooding, the claim would be straightforward.
The practical takeaway: the longer a leak persists undetected, the harder it may be to claim the full extent of the damage. Document your work thoroughly. And if a client reports a leak after your work, respond immediately — don’t let it turn into a gradual problem.
Some insurers offer limited cover for gradual damage. Ask your insurer directly about their position before you need to claim. Don’t find out there’s an issue for the first time when an assessor is standing in a flooded house.
Common Water Damage Claim Scenarios
Understanding how claims actually play out helps you understand your exposure. Here are the scenarios plumbers see most often.
The Failed Flexi Hose
Flexible braided hoses are standard in Australian plumbing — they connect tapware, toilets, dishwashers, and basins. They’re also one of the most common failure points. A flexi hose bursts, usually at the crimped connection, and water escapes at full mains pressure. If the hose was one you supplied and installed, the resulting damage is typically a straightforward PL claim. A burst flexi hose under a kitchen sink running overnight can easily cause $30,000 to $50,000 in damage across multiple rooms and levels.
The Unseen Joint Leak Inside a Wall
You run new copper through a wall cavity. You pressure test, everything’s fine. The wall gets sheeted, tiled, and finished. Three months later, a dark patch appears — one of your soldered joints has developed a pinhole leak. The claim involves stripping tiling, cutting open the wall, drying the cavity, repairing the pipe, and reinstating the bathroom. Costs typically run $15,000 to $25,000. Your PL covers the damage to the wall, tiling, and drying, but not the cost of repairing your soldered joint — that’s rectification of your own work.
The Dishwasher or Washing Machine Connection
A seemingly straightforward job: you install a new dishwasher connection. The connection isn’t quite tight enough, or a rubber washer fails. Water leaks behind cabinetry, out of sight, for a week. By the time it’s discovered, cabinetry has swollen, flooring is damaged, and the adjoining pantry has water damage. A $200 job becomes a $20,000 claim.
The Roof Plumbing Leak
Roof plumbing failures are among the more expensive claims because water travels downwards through the entire structure. A poorly sealed flashing, an overflowing gutter, or an incorrectly sized box gutter can allow water into the roof space, through insulation, saturating ceiling plasterboard, dripping through light fittings, and damaging walls and flooring below. These claims routinely exceed $40,000.
The Blocked Drain Overflow
You clear a blocked drain and leave. What you didn’t identify is a partial collapse further down the line that causes a backup the following week. Sewage or grey water overflows into the client’s laundry or bathroom. Sewage contamination claims are particularly expensive because they involve biohazard remediation on top of standard water damage repair — specialised cleaning, sanitisation, and disposal of contaminated materials.
Every one of these scenarios has happened to real Australian plumbers in recent years. None of them thought it would happen on their job. This is what insurance is for.
What’s Not Covered: The Fine Print That Matters
Your own faulty workmanship is not covered. If you need to open a wall, re-solder a joint, and re-sheet, your PL pays for the wall opening, drying, and resheeting — not the time and materials to fix the faulty joint itself.
Damage to the specific part you installed is typically not covered. If a hot water system you supplied fails and causes water damage, the damage from the leaking water is covered, but the replacement hot water system sits with the manufacturer’s warranty.
Damage to property you’re actively working on, before the work is complete and handed over, may not be covered under PL. Some policies have exclusions for damage during the course of works, or require a contract works policy instead.
Wear and tear of existing infrastructure you connect to is not covered. If you connect a new fixture to an existing pipe and that existing pipe — which you didn’t touch — fails, your liability for the resulting damage is less clear.
Damage caused by events outside your control — a storm overwhelming drainage you installed, a mains pressure surge, an earthquake — is not your liability and not a PL claim. Subsidence and foundation movement causing pipe damage is generally not a PL claim either.
Read your policy’s exclusions section before you need it. Call your insurer and ask them to walk you through anything unclear. It’s better to know now, while you can do something about it, than to discover a gap at claim time.
What to Do When a Water Damage Claim Lands
How you handle the first few hours directly affects the claim outcome.
First, get the water stopped. Talk the client through finding the isolation valve. Every minute the water keeps running increases the damage and the claim cost. You have a duty to mitigate the loss.
Second, get there if you can. Showing up demonstrates professionalism, lets you see the situation firsthand, and gives you the chance to document things before anyone else touches them.
Third, document thoroughly before anything is moved or cleaned up. Take wide-angle photos of every affected room and close-ups of the source of the leak. Photograph water levels and affected materials. Take video walking through the affected areas. Write down exactly what you observed, with times.
Fourth, help the client arrange emergency water extraction. Most insurers have preferred restoration contractors. The sooner professional drying begins, the lower the total damage.
Fifth, notify your own PL insurer immediately. Don’t wait to see how bad it is. Call their claims line, give them the facts, and get a claim number.
Finally, cooperate fully with your insurer’s claims team. Be honest. If you made a mistake, say so — insurers deal with mistakes all the time. What they don’t deal well with is being misled.
Do not admit liability or agree to pay anything. Expressing regret isn’t an admission of legal liability. But don’t say “I’ll pay to fix this” or sign anything from the client or their insurer. Let your insurer handle liability and payment. Anything you agree to out of a sense of obligation can end up coming out of your own pocket.
Water Damage Prevention: Reducing Your Claim Risk
The best water damage claim is the one that doesn’t happen. While no plumber can eliminate the risk entirely, practical steps meaningfully reduce it.
Pressure test every installation before you leave — even on small jobs. A five-minute pressure test catches most leaks before they become claims. Use quality fittings and materials with Australian WaterMark certification. Saving a few dollars on no-name flexi hoses is false economy compared to the cost of a claim.
Don’t bury joints in walls unless you absolutely have to. Design pipe runs so joints are accessible — in ceiling space, behind an access panel, in a cupboard. Inaccessible joints are claims waiting to happen because leaks can run for weeks before they’re visible.
Document completed work before walls are closed up. Take photos of pipe runs, joints, and connections in wall cavities and under floors. Use written quotes and contracts that clearly describe the scope of work. If there’s a dispute about whether you were responsible for a particular connection, having it in writing resolves the argument.
Review your quality control habits honestly. Are you pressure testing every job or just the big ones? Are you using the same quality materials you’d use in your own house? The habits that prevent claims are the same habits that make you a better plumber.
The Role of Your Client’s Home Insurance
When water damage happens, two policies come into play: your PL policy and the client’s home and contents policy. Typically, the client’s home insurer handles the immediate response — emergency water extraction, assessing damage, organising repairs. The client pays their excess and their property gets fixed. Then their insurer turns to your PL insurer to recover costs through subrogation.
This is normal. It’s not the client suing you — it’s their insurer recovering what they paid out from the party they consider responsible. Your PL insurer handles this process, including determining liability and negotiating settlement.
If the client’s insurer contacts you directly, refer them to your insurer immediately. Don’t give a statement, answer detailed questions, or provide documents. Let your insurer handle the communication. In some cases, your insurer may arrange repairs directly rather than through subrogation, which can be faster.
The client is not your adversary in a water damage claim. They’re stressed about their damaged home. Be professional, be responsive, show up, and let the insurers handle the money. Your relationship with the client can survive a claim if you handle it well.
How a Water Damage Claim Affects Your Premium and Insurability
A water damage claim will have consequences at renewal. A single claim, particularly your first with an otherwise clean history, typically increases your premium by 10 to 25 per cent for three to five years. For a plumber paying $900 per year, that’s an extra $90 to $225 annually — manageable but not trivial.
Multiple claims in a short period have more significant impact. Two water damage claims in three years can push your premium up 30 to 50 per cent or more. Some insurers may decline to renew, pushing you to specialist insurers with higher premiums and stricter conditions.
Frequency matters more than the size of a claim. Insurers are often more concerned about a plumber with three small $10,000 claims than one with a single $80,000 claim. Frequency suggests systemic work practice issues.
This creates a decision point for small incidents. If a claim would be for $2,000 to $3,000, consider whether handling it directly makes more financial sense than claiming and wearing the premium increase for years. Do the maths for your situation.
Talk to your broker or insurer before deciding whether to claim. They can guide you on how a particular claim might affect your premium. Most would rather you ask the question than make a claim and regret it.
Reviewing Your Cover: Is Your Water Damage Exposure Actually Protected?
Too many plumbers assume their PL covers water damage without checking the details. Here’s a practical checklist.
Call your insurer and ask: does my policy cover water damage from my plumbing work without exclusions that might apply to gradual leaks? Is there a sub-limit for water damage claims? What are my notification and mitigation obligations? Does my policy cover water extraction and professional drying? What happens if a claim involves multiple apartments in a strata complex?
Check your policy wording for: the definition of “occurrence” or “event” (determines whether one leak affecting multiple properties is one claim or multiple), any exclusion for “gradual,” “continuous,” or “repeated” damage, any condition requiring specific steps when water damage occurs, and the excess that applies to water damage claims specifically.
If your insurer can’t give you clear, straight answers to these questions, consider whether you’re with the right insurer. Water damage is the most likely claim you’ll ever make. You should know exactly where you stand.
Getting the Right Cover for Your Plumbing Business
For most plumbers, a standard PL policy with a reputable insurer who understands plumbing risks provides appropriate water damage cover. Standard policy wording from major Australian insurers generally covers sudden and accidental water damage from your work without unusual exclusions.
But not all PL policies are equal. Cheaper policies marketed to trades generally rather than plumbers specifically can have more restrictive wording, lower sub-limits, or broader exclusions. When comparing policies, look at the exclusions first, not the premium. A $700 policy that excludes gradual water damage might end up more expensive than a $950 policy that covers it. Comparing quotes through BizCover lets you check multiple policy wordings side by side before you commit.
If your plumbing business handles high-value properties where water damage claims could be substantial, consider whether $20 million in PL cover is more appropriate than $10 million. Water damage in a multi-storey luxury apartment building involving multiple units can easily run past seven figures once you factor in emergency response, drying, structural repairs, contents replacement, and temporary accommodation.
For plumbers who want to see what’s available in the current market, you can get a quote through BizCover to compare policies and premiums specific to your circumstances.
Disclosure: This article contains general information only. It does not constitute financial advice. You should read the relevant Product Disclosure Statement (PDS) before making any insurance decision. plumberinsurance.au may earn a commission from BizCover if you purchase a policy through the links on this page. This does not affect the price you pay.
Frequently Asked Questions
Does my PL cover water damage if I wasn’t negligent?
Yes, generally. PL insurance covers you for legal liability arising from your work, and negligence is the usual basis. If the water damage was caused by your work but you weren’t negligent — perhaps a certified fitting failed through no fault of your installation — you may not be legally liable. However, your PL policy will still cover the cost of defending the claim and determining liability. The outcome depends on the specific facts.
What if the client contributed to the water damage?
If the client’s actions contributed — for example, they turned the water back on before work was complete, or ignored your advice — your liability may be reduced. Australian law recognises contributory negligence, where the injured party shares some responsibility. Your insurer will investigate and negotiate a reduced settlement if applicable. This is another reason to document your instructions to clients in writing.
How long after completing a job can a water damage claim be made?
In most Australian jurisdictions, the limitation period for property damage claims is six years from the date the damage occurred or became apparent. For personal injury, it’s generally three years. A claim for water damage from work you did years ago can still land on your desk. The relevant policy is the one in place when the damage occurred, not when the claim is made. Keep your old certificates of currency and policy documents — you might need them years later.
Should I offer to pay for small water damage incidents out of pocket?
This depends on the numbers. If the repair cost is less than your excess plus the likely premium increase over the next few years, paying directly can be the better financial decision. But be careful: paying out of pocket can be seen as an admission of liability, and what looks minor initially can turn out to be more extensive once walls are opened up. If in doubt, report the incident to your insurer and discuss the best approach before committing to anything.
Does my PL cover water damage from work done by my apprentice?
Yes, provided your PL policy covers your employees. Most standard PL policies for plumbing businesses extend to cover employee actions within the scope of their employment. However, you must have declared that you have an employee to your insurer — if your policy was issued on the basis that you’re a sole trader and you’ve since taken on an apprentice without updating your insurer, you may have a coverage gap.