My husband is a licensed contractor in Tennessee. Which means the State certifies that he is a qualified contractor, which includes paying yearly fees and passing certain tests to have this license. Many States have varying requirements to obtained a Contractors License.
We also carry General Liability Insurance, which means that any unplanned accident that happens in your home while under construction, will be covered by the contractor you have hired, and not end up becoming the responsibility of the homeowner or any Insurance they personally have.
Worker's Compensation Insurance is where they stick it to us contractors.(The more dangerous the work, the higher the cost.) This Insurance is important if an Employee is hurt. This is something that homeowners never want to be involved in handling, especially if someone is hurt badly on your premises.
In my opinion, when people hire someone who is not licensed they are not only taking personal financial risks if things don't go as planned, But they are also helping these fly by night contractors get away with beating the system. The same system that Licensed Contractors abide by and pay out high costs for, just to be a legal Contractor.
I suggest hiring someone who can show you their Contractors License and can have Certificates of Insurance sent to you by their Insurance Companies. It will give you a greater peace of mind about the whole project.
Hope you love it when it's complete....Good Luck!