1. Observe and protect
Note what's happening, stop it from getting worse if it's safe to do so, and collect any relevant background.
2. Evaluate the house and site
Tile hides the decisions that matter most: where the drain lands, what the framing is doing, how waterproofing is detailed at each transition, whether ventilation is sized right, and how the crew can access the space.
3. Define a written scope
Document preparation, protection, materials, access, permit responsibility, testing, cleanup, and change-order rules before anything begins.
4. Compare providers
Vet credentials, and compare the reasoning and boundaries of each bid, not simply the final number.
5. Inspect closeout
Confirm testing results, cleanup, documentation, and warranty coverage, plus who handles maintenance from here.