Sources checked October2026. This draft distinguishes statewide credentials, local rules and unanswered questions.
Mechanical contractor classification required for regulated HVAC work
Last verified:October2026 for the linked source facts. Unverified fields remain open below. Requirements change — confirm with the state board before applying. Not legal advice.
Installing, altering or servicing HVAC, refrigeration and related listed mechanical systems requires the appropriate mechanical contractor classification. Mechanical permits generally precede work, apart from minor-parts replacement.
Scope:Michigan statewide · verified
Official source →The linked experience-change notice specifies three years or 6,000 hours in each classification, or board-accepted equivalent, documented by contractor employer statements. Additional classifications can have prerequisite licenses held for three years.
Scope:Michigan statewide · verified
Official source →Applicants pass an exam for each desired classification. PSI administers exams and collects examination fees.
Scope:Michigan statewide · verified
Official source →The notice lists $300 initial mechanical contractor license/classification; adding a classification is $300/$200/$100 by first/second/third cycle year.
Scope:Michigan statewide · verified
Official source →Mechanical contractor renewal: every three years by August 31, $300.
Scope:Michigan statewide · verified
Official source →Confirm your precise work, contractor status and local enforcing authority before applying or offering regulated work.
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