Bathrooms
A bathroom refit done from the pipework up.
Full bathroom refits, starting with first-fix plumbing behind the walls and finishing with a room that's properly tiled, sealed and fitted.
First-fix pipework run and pressure-tested before any wall goes back up.
Wall-hung WCs and basins fitted to concealed frames, not left on exposed brackets.
Tiling set out from a level datum, not just started in a corner and carried on.
Extraction and waterproofing fitted to building-regs standard, not an afterthought.