Mich. Comp. Laws § 125.1523a: Civil violation; penalty; enforcement.

Sec. 23a.

In addition to any other penalties or remedies provided by law, a person who is required to be licensed as a residential builder or residential maintenance and alteration contractor, or as a master or journeyman plumber, an electrical contractor or master or journeyman electrician, or a mechanical contractor shall not perform work on a residential building or a residential structure without first obtaining a license. A person who violates this section is responsible for a civil violation, and shall be fined not less than $100.00 or more than $500.00.

The prosecuting attorney of the county in which the residential building or residential structure is located or the attorney general may enforce this section.