subject: Is It Time To Repair Or Replace My Roof? [print this page] When soliciting bids from roofing contractors, do your homework. Be sure your bidding contractors are insured and licensed as required by local building codes. Ask for bids in a way that helps you perform an apples-to-apples comparison. Roofing industry jargon can get deep pretty fast. Be sure you understand exactly what each roofer is offering in their bid. Consider not only the shingle warranty (generally 30 years or higher) being offered but also ask you contractor what guarantee they provide on their workmanship. Standard workmanship guarantees offered by the contractor are 3 to 5 years. A truly exceptional roofing contractor, however, will offer a free service guarantee for as long as 10 years. Most importantly, bid prices that seem too good to be true, probably are.