What's causing my water problem?  - (They should explain based on inspection)

How did you diagnose this? - (Look for thorough inspection process)

Is this a structural issue or a drainage issue? - (Important distinction)

Will this problem get worse if I wait? - (Honest assessment)

What method do you recommend and why? - (Should match your situation)

Why is this better than other options? - (Should explain trade-offs)

Will you need to excavate? - (Affects cost and timeline)

What if this doesn't solve the problem? - (What's the contingency?)

Can you do interior, exterior, or both? - (Some contractors specialize)

What's included in this estimate? - (Should be itemized)

Are there any additional costs I should expect? - (Transparency matters)

What's your payment schedule? - (They should know exactly how the payments are divided, when to pay and what amounts, typically % down, % work in progress and % upon completion)

How long will this take? - (And what factors could delay it?)

What's your availability? - (How soon can you start?)

What warranty do you offer? - (Get it in writing)

What does the warranty cover and not cover? - (Be specific)

How long is the warranty? - (Material vs. workmanship)

Is it transferable if I sell my home? - (Adds resale value)

How do I file a claim if there's a problem? - (Should be straightforward)

How long have you been in business? - (Longer is better)

Can you provide 3 references from the past year? - (Actually call them)

Are you licensed and bonded in this state? - (Verify independently)

Do you have liability insurance? - (Ask for proof)

Do you have any certifications or memberships? - (Professional organizations add credibility)