Moving to Michigan as a master plumber: every state's rule

Michigan issues a statewide, person-held Master Plumber license through LARA's Bureau of Construction Codes under MCL 339.6113; the Plumbing Contractor license (Form BCC-329, $300, MCL 339.6111) is the separate business credential that must be represented by a master plumber, and a master may represent only one contractor at a time. Local plumber licensing is preempted by MCL 339.6125(1). A new master applicant must be at least 18, hold a journey plumber license and have gained 4,000 hours of experience as a journey plumber over at least two years immediately preceding the application with no lapse in licensure, document that experience with notarized employer letters, pay the license fee at application ($300 for a license term of up to three years, prorated outside the April 30-June 30 renewal window), be approved by LARA, and pass the PSI Master Plumber exam (130 questions, 180 minutes, 75% to pass, open book on the 2021 Michigan Plumbing Code, available in person or online; $100 fee). The license renews every three years for $300, and renewal requires a board-approved code-update course within 12 months after each state construction code change. Michigan has no reciprocity with any state; an out-of-state master must pass the Michigan exam, with out-of-state experience credited only after State Plumbing Board review.