In Texas, a plumber is not just someone who knows how to plumb. We start as apprentices. We have to have a minimum of 4,000 hours working under a master plumber in order to be eligible to test for our tradesman license. A total of 4,000 hours is equivalent to two years, like an associate's degree. The test typically takes about six hours to complete. We have to be trained in OSHA, plumbing license law, and plumbing code. In order to be eligible for our journeyman license, we have to put in a total of 8,000 hours, about four years. This is equivalent to a bachelor's degree. More OSHA training is also needed. This also makes us able to work on commercial buildings. Master plumbers have a minimum of 8,000 hours plus four calendar years. A journeyman is required to take a six- to eight-hour hour test in Austin. A license is required for someone to become a plumber. With all the experience gained during this time, and full knowledge of plumbing license law and plumbing code requirements, why would you want to hire a non-licensed person to perform plumbing work in your home?