Sam called us because the kitchen ceiling below the upstairs bathroom had a brown stain that wouldn't go away. Removing the cornice confirmed the obvious: 1970s-era waterproofing at the shower curb had failed, and moisture was wicking into the timber framing.
The right answer was a full strip-out, not a patch. New ARDEX WPM 002 membrane, full PS3 documentation lodged with the council, 600x300 matt porcelain on the floor and walls, brushed brass fixtures throughout.
Sam was clear from the start: not a designer bathroom, just a properly built one. We kept the layout exactly as-was and put the budget into the bits that don't show — membrane, framing repair, and a Master Plumber-certified rough-in we knew would last.