Start by asking for proof of insurance and a license, then verify their reputation through local reviews and the Better Business Bureau. Make sure they provide a detailed written estimate, not a vague quote, and ask about their warranty for materials and workmanship. It's also smart to get at least three bids, but don't just go for the lowest price—compare coverage and quality. Finally, ask for references from recent jobs similar to yours, and visit one if possible to see their actual finish. how to vet a roofing company 13