01
Start with the puddle you already know about
Show the team where water collects, where the grout discolours or where a smell appears after a shower. Those clues help them decide what to inspect. If you want a walk-in shower or a relocated drain, ask the specialist to confirm the available floor depth and the connection route before choosing a tray or ordering tile.
02
Agree the inspection while the floor is open
Ask what waterproofing system the installer intends to use, who is responsible for the corners and pipe penetrations, and what checks the system and building require. Make those checks a written step before tiles go down. Ask for photos of the concealed work and the result of any agreed tests to keep with the handover records.
03
Check the small parts you will have to reach later
Ask how you would reach a concealed cistern, shut-off valve or fan after the walls are finished. Then take the chosen tile sizes and vanity dimensions back to the plan. A small change to a mirror, niche or screen position now can avoid awkward cuts or a handle that clashes with the shower door later.
04
Try the bathroom before calling it finished
Run the shower and basin, watch how water leaves the floor and open the vanity drawers with the bathroom door in its usual position. Check the fan, sealant and fittings with the installer present. If this is the household’s only bathroom, arrange an alternative before strip-out and ask when the room can actually be used again.