The membrane is the only barrier between a shower and the frame, and it is under tile within days.
Wet area failure is the most expensive repair in a finished home, because reaching the membrane means taking off the tiling and often the lining behind it.
Annotated findings from Waterproofing inspections on Melton South builds. Client addresses withheld.

1Bored piersAfter boring and cage placement, ahead of concrete
2Slab pre-pourThe day before the pour, with steel, pods and formwork open
3FrameOnce frame and trusses are up and the roof is on, before sarking
4Lock-up (pre-plaster)After roof, cladding and external doors, before plaster
5FixingAfter mouldings, doors and joinery, before the painter
7Pre-handover (PCI)Roughly a week ahead of practical completionInstant online pricing, or talk to the booking team on 1300 471 805.
By then it is under tile, and checking it means removing that tile.
AS 3740 for waterproofing of domestic wet areas, with the NCC.
No, that is intrusive and belongs to the waterproofer.
Victorian builders normally roll the two together as fixing including waterproofing.
Tell us. The value drops sharply once tile is down.
The waterproofer, before tiling.