01
The assembly, not just the finish
The water-management assembly, plumbing layout, enclosure and finish fabrication create separate scopes. A curbless shower can affect floor build-up and drainage beyond the visible tile. Large stone formats may change handling, layout and substrate preparation. Existing-condition investigation should establish what is known instead of embedding an unexplained risk premium in every finish.
NAHB · homeowner remodeling preparation02
Ownership and maintenance
Budget access for valves, drain cleaning and enclosure hardware. Identify compatible care across grout, sealant and natural stone. A finish upgrade does not remove responsibility for concealed waterproofing and plumbing. Distinguish repairable surface damage from a leak requiring investigation.
03
What the proposal must include
Compare demolition, substrate, complete shower system/drain, fixtures and valves, vanity, stone/tile, enclosure, ventilation, electrical, painting and final protection. Name who attaches the glass after waterproofing and who documents concealed work. Exclude duplicate fixture purchases already included in an allowance.
04
Resolve before procurement
Approve plumbing and enclosure positions before pricing finished surfaces. Use direct allowances for defined assemblies in the cost model; keep unknown hidden work separate. Ask the parcel authority about review of plumbing/electrical and accessibility-related changes where applicable.