Many plumbers play off your fear of the unknown to charge you more. Some plumbers charge by the hour, others by the job. By the hour is pretty straightforward -- they work, you pay for the time. Those charging by the job are really selling plumbing... and insurance. They say paying by the job means a guaranteed price and peace of mind. You are betting -- just like with insurance -- that something is going to go horribly wrong. Now, who is in a better position to make that bet? The plumber who does this work every day or you? So when hiring a plumber ask them how they charge. Then ask yourself, do you want to pay for plumbing or insurance?