Separate layout from finish decisions
Moving plumbing, walls, ventilation, or electrical services is different from replacing finishes in the existing layout. Make that distinction clear in every request.
Document the wet-area assembly
Ask the project team to define substrate preparation, waterproofing, tile setting, penetrations, ventilation, and testing responsibilities.
Confirm approval requirements
Permit needs depend on the scope and municipality. Condominium projects may also require management approval, booked elevators, protection, and restricted work hours.
Official sources
Requirements can change. Use these primary sources and confirm details for your property and municipality.