What to request :  When you believe you have found a good contractor, ask for their credentials. They'll be bonded and insured ( overall liability and employee's compensation ). Ask for the name of their insurance agency, look up the number yourself, call the insurer and ask for a copy of the Certificate of Insurance.  Ask for the contractor's portfolio and references. Remember a contractor will generally only show you their favorable work and comments.  learn how long the contractor has been in business and how long they have worked with their crew.  Find out if the contractor will be working on concurrent projects. If working on multiple roles, will they be in a position to devote sufficient time to your project. When Beginning Negotiations :  start by making a listing of projects that have to be finished. Ensure the roles done fit into your position and make allowances for surprising scenarios.  Create and commit to a contract. Some contractors don't like completion dates because weather can be unpredictable. Take into account their concerns and come up with a fair finish date.