Roofer wear & normally need official education, however they require on-the-job experience to learn their trade. While each state has various licensing guidelines, a lot of require a roofing contractor to have at least two years of experience before they can become licensed. These specialists also need liability insurance coverage, to be bonded and to have a business license. HomeAdvisor can assist you discover the right roofer for your project. While each state has different licensing guidelines, most require a roof professional to have at least two years of experience prior to they can become certified. These professionals also require liability insurance, to be bonded and to have a service license.