Start beneath the building
The crawl-space scope concerns underfloor access, moisture exposure and visible materials or services. It may need drainage or plumbing coordination.
Start at the room above
Subfloor repair concerns the floor assembly and its finish. A bathroom may require fixture work and flooring restoration even when access below is available.
Compare the access choices
Working from below may limit finish disturbance but may not provide adequate access for every task. Opening from above has different restoration needs.
Keep the two responsibilities connected
A floor repair without source correction can leave an unresolved exposure. A moisture-only scope may leave damaged floor materials unassigned. Ask for a clear division of work.
Photos help start the review. Access, concealed conditions and required professional review can change the construction scope.