1. Write down what you're actually seeing
Note where the problem shows up, how long it's been there, and anything tried already — a few photos and a rough timeline make the first call far more useful.
2. Get eyes on the house, not just the bathroom
Drain location, whether the framing underneath is sound, how waterproofing turns the corners, whether ventilation actually clears the room, and what the electrical panel can support — all of it gets checked before materials get chosen.
3. Get the scope in writing
Prep work, protection for the rest of the house, materials, permits, inspection points, cleanup, and what happens if a change comes up mid-project should all be spelled out before work starts.
4. Compare more than the bottom line
Two proposals with the same total can cover very different scopes. Check credentials and read what's actually included, not just what it costs.
5. Walk through it before calling it done
Testing, cleanup, paperwork, warranty terms, and anything you're responsible for maintaining afterward should all be confirmed at closeout.