Important questions to ask a general contractor?

[Nat C.]

I'm about to hire a GC for a 100K job. I've been burnt many times dealing with contractors and I'd like to avoid it happening again.

What are the questions I need to ask before signing a contract? These are what I've come up with so far-

How long have you been in business?

Can you please provide contact details for 10 clients you've done major remodels?

Where will you be hiring your sub-contractors from and how do you guarantee the quality of their work?

Do you have a criminal record? If yes, please.

Have you ever been sued by a client? 

[David Robertson]

Here's a Contractor Pre-Qualification Form I have posted in my File Place, which is a formalized form which lists many of the questions you mentioned above, including Contractor Experience, References, Insurance & Legal Information.

http://www.biggerpockets.com/files/user/drobertson/file/sample-contractor-prequalification-form