Ask for and check references, ask to see their state license, check to see that their license number is on their business card, and proposal, check their license number on the state web page(www.myflorida.com) for any state complaints, check your local building department to see if there are any local complaints against them. If they ask you to secure the permit, a red flag should pop up. They may not be licensed, which puts the homeowner totally at risk.
Click here to visit the Building Division web page.