Plumbing License in Michigan: Fees, Requirements & Startup Costs

By Muhammet Çay

Who licenses what: business versus individual qualifier

Michigan separates the business credential from the individual qualifier. The Plumbing Contractor license is the business credential, and the applicant must be a sole proprietor, partner, corporate officer, or LLC member. That applicant must also hold or employ a Master Plumber. The Master Plumber is the licensed qualifier in charge of plumbing code compliance, and one Master Plumber qualifies only one Plumbing Contractor license at a time. A company cannot simply file paperwork and begin contracting; the qualifying master is part of the licensing structure.

Both credentials require separate PSI exams and separate initial applications. A person who holds both licenses renews both by entering the contractor number, according to LARA renewal guidance. Whether that produces one combined $300 payment is not explicit in the reviewed materials, so do not assume a single renewal charge covers both.

License classes and the path into contracting

There are two license types to plan around. The Master Plumber license is the individual credential. The Plumbing Contractor license is the business credential. A new business typically needs the contractor license, which depends on access to a qualifying master. If the owner is not already a Master Plumber, the business must employ one, and that master’s qualifier status is limited to a single contractor.

The Master Plumber path requires the applicant to be at least 18 years old and to have at least 4,000 hours working as a journey plumber over at least two years immediately preceding the application. The Plumbing Contractor applicant supplies five years of residence and business history. The reviewed LARA materials do not list a separate education requirement for either license.

Exams and fees

PSI administers both the Master Plumber and Plumbing Contractor examinations. Each attempt costs $100, per the PSI bulletin. The initial Plumbing Contractor application fee is $300, and the initial Master Plumber application fee is also $300. These are separate applications, so a new business that needs both credentials should budget both application fees and both exam fees rather than treating them as one charge.

The reviewed LARA materials do not list a bond, insurance, or background-check requirement for either license. If a client or general contractor requires coverage, that is a contractual matter rather than a state licensing condition on the reviewed sources.

Renewal and continuing education

Both licenses renew every three years. The renewal fee is $300, according to LARA. Renewal fees are not starting costs; they apply later in the license cycle. A master code update course is required within one year after adoption of a new code. Fixed continuing education hours were not confirmed on LARA’s published materials, so verify the current requirement before the renewal date.

Put renewal dates and any code-update deadlines on the operating calendar. A contractor license that lapses can interrupt active jobs, and the qualifier relationship should be documented so both parties know who is responsible for code compliance.

The local layer: permits and inspections

Local plumbing permits and inspections may be required by the authority having jurisdiction. A state license does not set a statewide permit policy. Before bidding work, ask the city or township for each job address which work needs a permit, who must apply, and how inspections are scheduled. Add permit time and inspection returns to the estimate, especially on replacements and remodels.

For a broader comparison of credentials, read the plumbing license requirements by state. Neighboring and comparable states include Ohio and Georgia. The plumbing business guide covers operations beyond licensing, and the startup costs page explains how fees, tools, and vehicles shape the opening budget.

Last updated: October 21, 2026