On average, the overall cost of a two-four color paint job on an RV is going to cost anywhere from as little as $5,000 to as much as $15,000 for a standard RV that is 30 or more feet long. The costs will depend on the length of the RV, the type of paint being used, the geographical location and the professional contractor you’re using. According to one person who shared his opinion in an online forum at RVforum.net, the average cost to paint an RV is around $8,000 to $10,000 for a professional job.