You have to find someone who is local and stands by their work (this can be tough but talk to neighbors/friends/etc). Then treat them well by always paying a ti

You have to find someone who is local and stands by their work (this can be tough but talk to neighbors/friends/etc). Then treat them well by always paying a tip over the quoted price. Honest businesspeople exist, they will remember your generosity, stand by their work, and go the extra mile to make it right if they make a mistake. It's relationships, not legal guarantees. There's not enough paper in the world to protect you from a dishonest contractor or tradesman. Finding someone honest and then overpaying is the premium option.