Do I need a waterproofing certificate in NSW?

You should always receive documentation showing who waterproofed the wet area, their licence details and what system was used. It matters at resale, for any warranty claim, and if a defect appears later. Keep it with your other building paperwork.

Is waterproofing licensed work in New South Wales?

Yes. Waterproofing of wet areas is licensed work in NSW and should be carried out by someone holding the appropriate licence. Ask for the licence number and check it before work starts.

What if the previous owner has no waterproofing paperwork?

Common in older homes and not necessarily a problem in itself, but it means there is no record of when the wet area was last done or to what standard. If there are any signs of moisture, an inspection is worth more than the paperwork would have been.

Waterproofing Certificates in NSW: What You Should Get and Why It Matters

Waterproofing is the one part of a bathroom you cannot inspect after the fact without destroying the room. The documentation is the only durable record that it was done, by whom, and to what standard.

Why it is licensed work

In New South Wales, waterproofing wet areas is licensed work. That exists because the consequences of failure are structural rather than cosmetic, and because the work is concealed the moment the tiles go on.

Practically, it means you should be able to ask for a licence number and check it against the public register before anyone starts. Any legitimate operator expects that question.

At S and T Tiling Renovations we hold builder licence 151440C, and it is on every quote we issue.

What you should end up with

After the wet areas in your bathroom are waterproofed, you should have a record showing:

Who did the work and their licence details.
What was waterproofed. Which rooms and which areas within them.
What system was used. The membrane product and the primer, not just the word waterproofing.
When. The date the work was carried out.
Any warranty offered on the membrane system or the workmanship.

Keep it with the rest of your building documentation. It is a small file that becomes valuable at exactly the moment you would rather not be searching for it.

When it actually matters

Selling. A buyer's building inspector will look at the wet areas closely, because that is where the expensive problems hide. Being able to show when the bathroom was waterproofed and by whom is a straightforward answer to an awkward question.

Insurance. If water damage occurs, the first question is usually whether the work was done to standard by a licensed party. Documentation answers it.

Defects. If a problem appears within a warranty period, the paperwork is what makes the claim simple instead of a dispute.

Strata. If you are renovating an apartment, the owners corporation will very likely want evidence that wet area work was done properly and by a licensed trade. Many strata schemes require it before approving the works.

What about older homes

Plenty of Sydney bathrooms were built before waterproofing was treated the way it is now, and many older homes have no paperwork at all. That is not unusual and it is not automatically a problem.

What it does mean is that nobody knows the condition of the membrane, or whether there is one. If the bathroom is showing any of the warning signs, the absence of documentation is a reason to look properly rather than assume.

The practical version

Ask three questions before work starts: what is your licence number, which membrane system are you using, and what documentation will I have at the end. All three have short answers if the person is doing it properly.

Our waterproofing service covers wet areas to AS 3740, and you get the paperwork.