Michigan Codes, Permits, and Licensing Requirements
Candidates should understand that Michigan adopts model codes with state amendments and that local jurisdictions enforce them. Know that HVAC work generally requires a permit and inspection, and that contractors must hold a state mechanical contractor license with a qualified master or journeyman. Understand the difference between a contractor license (held by the business) and an individual license (held by the tradesperson), and that pulling permits without the proper license is a violation.
Know the roles: the Michigan Department of Licensing and Regulatory Affairs (LARA) oversees occupational licensing, while local building departments issue permits and perform inspections. Be familiar with the concept of code adoption cycles and that the currently enforced edition governs the work, not the newest published edition. Understand inspection stages: rough-in (before concealment) and final.
Traps: assuming a license from another state transfers automatically; confusing a permit with a license; and believing that homeowner exemptions allow unpermitted gas work. Also watch for questions that treat manufacturer instructions as optional - they are part of the installation standard.
Rule of thumb: When code and manufacturer instructions conflict on installation specifics, follow the more restrictive requirement and document it. Worked example: replacing a furnace requires a mechanical permit and inspection; the installer must be licensed or working under a licensed contractor, and the final inspection verifies venting, gas piping, and clearances. Always verify the locally enforced code edition before designing.