Check with the Attorney General's Office, Better Business Bureau or the local trades council to find out about complaints filed against a contractor. Request a contract. Don't sign a blank or incomplete contract. A complete contract will list the work to be completed and costs, as well as stating who will apply for the necessary permits or licenses. Don't get pushed into making a decision quickly.
Some sellers use scare tactics or misrepresent the quality and value of their products or services.
If the offer is good for only today, then look elsewhere. Get proof of insurance. Make sure a contractor carries general liability insurance and workers' compensation. If the contractor is uninsured, a homeowner may be liable if an accident occurs on the property or a structure is damaged. Get guarantees in writing, including who is responsible for equipment and materials.