1. Observe and protect
Log the symptoms, contain further damage where possible without risk, and gather whatever history you have on the area.
2. Evaluate the house and site
The parts that fail first are the parts you can't see — drain position, framing condition, waterproofing at the transitions, fan output, and access to the space all decide how the project actually goes.
3. Define a written scope
Lay out prep, protection, materials, access requirements, permits, testing, cleanup, finish restoration, and exclusions in the written scope.
4. Compare providers
Run a credentials check, then compare the logic and limits of each proposal rather than only the total cost.
5. Inspect closeout
Make sure testing, cleanup, paperwork, and warranties are complete, and confirm what maintenance is now yours.