In short: On an August 2026 building and pest inspection in Castle Hill, readings at the base of the wall behind the ensuite shower screen were high while the surface looked sound. That single finding changed how the buyer approached the purchase.
Nothing to see on the surface
The ensuite had been renovated at some point and presented well: clean grout, fresh paint, a frameless screen. Plenty of buyers would have walked past it. On a building and pest inspection we take readings wherever a wet area meets a wall, so the meter went on the skirting behind the screen.
What the meter showed
The readings at the bottom of that wall were high, and a second reading a little further along confirmed it. The same house also had staining under a rear bedroom window and a ceiling mark in another room, so moisture became the theme of the report rather than a one off item.
The buyer's side of a wet wall
A damp wall behind a shower usually means one of two things: a membrane that has failed at the screen junction, or a plumbing leak inside the wall. Both are repairs that start with removing tiles. Damp timber also draws subterranean termites, which is why a combined building and pest inspection catches it best.
What we recommended
Further investigation by a licensed waterproofer before exchange, and a written repair figure. The meter shows that a wall is wet. It does not say why, and nobody should guess the cost of a bathroom repair from a reading alone.
The wider pattern in Castle Hill
Many Castle Hill houses are on their second or third bathroom. Some renovations show no visible membrane at all. The cooling off period is the time to find out, while you can still use what you learn.
Written by our local inspection team from work carried out in Castle Hill. Licensed building practitioners, NSW Fair Trading licence 366177C.
