Roofing contractors put on & normally require formal education, but they need on-the-job experience to learn their trade. While each state has various licensing guidelines, most require a roofing contractor to have at least 2 years of experience before they can end up being licensed. These professionals likewise need liability insurance, to be bonded and to possess an organization license. HomeAdvisor can help you discover the right roofer for your project. While each state has various licensing guidelines, many require a roofing contractor to have at least two years of experience before they can end up being licensed. These experts also need liability insurance, to be bonded and to have a business license.