Building permits in Michigan
2 jurisdictions, each with the department that issues, its portal and its phone number. Cities issue their own permits; counties cover unincorporated areas, which is the distinction that sends most contractors to the wrong office.
2 checked against the department's own page
Licensing
A state Residential Builder license (or Maintenance & Alteration Contractor license) is required to build or alter residential structures for compensation; requires 60 hours of pre-license education.
Michigan LARA — Bureau of Construction Codes (Residential Builders' & M&A Contractors' Board)