Define the scope boundary
Clarify whether the project keeps the layout or moves plumbing, changes electrical, replaces the tub or shower and alters walls or ventilation.
Expect concealed-condition risk
Water damage, framing, plumbing, electrical and subfloor conditions may only be fully visible after demolition.
Coordinate finishes with construction
Tile, vanity, fixtures, lighting and accessories depend on dimensions, backing, waterproofing and installation sequence.