largest plumbing franchise in the world
1) Rooter-Man. Rooter-Man was originally founded in 1970 and has been franchising since 1981 and has 489 plumbing franchises in the U.S. and Canada. It is one of the largest plumbing franchises in the United States. It has a very stringent selection process for franchisees. Entrepreneur Magazine has rated it as the best plumbing franchise for ten consecutive years.