Waterproofing is invisible once the tiles go on. That's exactly why it's the risk that matters most.
A bathroom renovation touches tiling, plumbing connections, and waterproofing all in one job, and the part most likely to go wrong, the membrane behind the wall, is the part nobody can see once the job's finished. Cover that answers for the failure you can't inspect after the fact.
Where a bathroom fitter actually gets exposed
Bathroom renovation combines several trades' worth of risk into one job, but the exposure that stands out is waterproofing, because a failure there stays hidden until real damage has already happened.
The waterproofing that failed behind the wall
A shower renovation is finished and looks perfect. Months later, a slow leak behind the tiles is discovered, having already damaged the wall cavity and the room next door.
Damage to fixtures during the renovation
Removing an old bath or vanity, you damage adjoining cabinetry, flooring, or a fixture in the rest of the home that wasn't part of the job.
A plumbing connection that wasn't quite right
Reconnecting a toilet or basin as part of the renovation, a fitting isn't fully tightened and a slow leak develops that isn't noticed for weeks.
Who's going to ask you for it
Renovators and builders expect this before the job starts
Bathroom renovation work is usually engaged directly by homeowners or through a builder, both of whom increasingly expect proof of cover upfront:
- Head contractors and renovation companies typically want $10M public liability before subcontracting bathroom work.
- Body corporates want proof of cover before wet-area renovation in shared buildings.
- Homeowners on larger renovations increasingly ask for a certificate of currency directly.
The exclusion bathroom fitters assume is covered
A waterproofing failure discovered after handover is a defect in completed work, not an on-site accident. Because these failures are slow and hidden, they tend to be more expensive by the time they're found than most other trade defects. That's a product liability exposure, and it's the one to check most carefully for this occupation.
Common questions
A leak was found behind the tiles months after I finished. Is that covered?
Only if product liability is included, not just public liability. Given how expensive and slow waterproofing failures can be to surface, this is worth confirming specifically.
I subcontract the plumbing and electrical parts of the job. Does that change my cover?
It's worth telling us the full mix of trades involved. Even as the coordinating renovator, you can still be the first point of contact for a claim that traces back to a subcontractor's work.
What if the waterproofing failure is actually a manufacturing fault in the membrane product?
That's part of what gets investigated, whether the fault sits with the product or the application. As the installer, you can still be drawn into the claim either way.
Do I need higher cover for larger, higher-end bathroom renovations?
Often, yes. Larger and more complex renovations carry higher potential damage and rework costs, so it's worth reviewing your limit as your average job size grows.
I mostly do small repairs, not full renovations. Do I still need this?
Yes, even a repair job involving waterproofing or plumbing connections carries the same categories of risk at a smaller scale.