The Doylestown Township Police Department wants to warn all residents of driveway seal coating scams in the area. These people are operating without permits and over charging for work. We recommend that before you agree to any work you receive multiple quotes from reputable contractors. Generally the average 4 car driveway should cost between $275 - $350. If you believe the person you are dealing with is not legitimate contact the Doylestown Township Police immediately for assistance.