Most people assume a bathroom comes with the same warranty as a paint job. It doesn’t.
The Home Building Act 1989 splits statutory warranties into two periods: six years for a major defect, two years for everything else. When the Act was amended, waterproofing was expressly added to the list of major elements, alongside structural load bearing elements and fire safety systems.
So if the membrane under your new floor fails in year five, that is a six year warranty item, and the law is on your side. If your tiler grouted it badly and it looks ordinary, that is two years.
This is worth knowing for two reasons.
The first is that it tells you how seriously to take the part of the job you will never see. Waterproofing failures are among the most commonly litigated defects in New South Wales, and they are almost never visible at handover. They show up years later, usually on a wet patch in the next room.
The second is that it gives you a question to ask. A builder who knows the membrane carries a six year exposure treats it differently from one who thinks it is a two year problem.
How we do it, on every bathroom, house or unit:
- Full membrane to AS 3740, the Australian Standard for waterproofing of domestic wet areas
- Correct falls to the waste before anything goes down
- Membrane turned up the walls and into the corners and hobs, not stopped at the floor
- A flood test before a single tile is laid
- Photographs at each stage, handed to you at completion
That last one is the bit to insist on, from us or from anyone. A photo of your membrane holding water is the only proof you will ever have that it was done properly, because by the time anything goes wrong it is under two tonnes of tile.
NSW Fair Trading: building defect complaints and statutory warranty periods
