Michigan Compiled Laws, Chapter 339. Occupational Code § 339.5813

Sec. 813.  (1) Each work classification examination fee for a mechanical contractor's license is $100.00 or less, as determined by the department.  Except as otherwise provided in subsection (2), the initial and per-year fee for the issuance of a mechanical contractor's license is $100.00.

(2) An initial or renewal mechanical contractor's license expires on August 31 every third year and is renewable by filing an application and paying the license fee on or before October 31.  If an individual is applying for an initial mechanical contractor's license or relicensure at a time other than between August 31 and October 31 of the year in which the department issues renewal licenses, the department shall compute and charge the license fee on a yearly pro rata basis beginning in the year of the application until the last year of the 3-year license cycle.  A license that is not renewed is void for the purpose of obtaining a permit, and the contractor is eligible for relicensure only by applying for reinstatement and paying the license fee.  The department shall not compute and charge a license fee for a renewal license on a pro rata basis.  An individual who renews his or her license within 3 years after the license is voided under this section is not subject to reexamination for the license.