Roofing contractors wear & typically need formal education, however they require on-the-job experience to learn their trade. While each state has various licensing guidelines, a lot of require a roofer to have at least two years of experience prior to they can become certified. These experts likewise need liability insurance, to be bonded and to have an organization license. HomeAdvisor can help you discover the right roofer for your project. While each state has different licensing guidelines, a lot of require a roofing professional to have at least two years of experience before they can become certified. These specialists also need liability insurance, to be bonded and to have a business license.