Paperwork needed from contractor

[Crislie P.]

I am about to sign a contract with a contractor but before I sign, I would like to know what type of paperwork do you like to see from the contractor before signing a contract? I am thinking 1. Proof of license 2. Proof of insurance what else?

I would like to see if there is any complained filed under the contractor? How do I do that?

Would doing a background check make sense?