Roofer put on & generally need official education, however they need on-the-job experience to learn their trade. While each state has different licensing rules, a lot of require a roofer to have at least 2 years of experience before they can become licensed. These professionals also need liability insurance, to be bonded and to possess a business license. HomeAdvisor can help you find the best roofer for your project. While each state has various licensing rules, a lot of need a roof professional to have at least two years of experience before they can become certified. These specialists also require liability insurance, to be bonded and to have an organization license.