Michigan, Bay County HVAC Permit Regulations and County Ordinances for Unincorporated Areas

HVAC Permit Requirements in Bay County, Michigan

There is no countywide construction code or building permit program in Bay County. Consequently, there is no central "Bay County Building & Safety Division" that manages HVAC permits for the entire county. Instead, permit authority is decentralized and handled at the local level.

Permit Requirements for Unincorporated Areas

For properties located in unincorporated areas of Bay County, you must determine the specific enforcing agency for your location. Because there is no countywide department, you must contact the applicable township office or the specific inspection agency contracted by your township to handle building, mechanical, and other construction permits. In some instances, if a local jurisdiction does not have its own building department, the State of Michigan may hold jurisdiction.

Before beginning any HVAC work—such as installing, replacing, or modifying heating, cooling, or ductwork systems—you must contact your local township office to verify the permit requirements, as most mechanical work requires a permit and subsequent inspection to ensure compliance with the Michigan Mechanical Code.

Resources to Learn More

Note: The following state-wide building codes and regulations apply universally to all jurisdictions within Michigan, including Bay County.

Michigan Hvac Legislation, Codes, and Guidelines

Michigan HVAC Building Codes and Legislation

In Michigan, the regulation of heating, ventilation, and air conditioning (HVAC) systems is governed by a framework of state-adopted codes. The primary enabling legislation is the Stille-DeRossett-Hale Single State Construction Code Act (Public Act 230 of 1972), which authorizes the state to establish uniform construction standards.

For mechanical systems, Michigan has adopted the 2021 Michigan Mechanical Code, which is based on the 2021 International Mechanical Code (IMC) with specific Michigan amendments to address local climate, safety, and enforcement needs. For residential projects (one- and two-family dwellings), HVAC requirements are primarily contained within the Michigan Residential Code, which is based on the 2021 International Residential Code (IRC) with state-specific amendments.

These codes establish the minimum requirements for the design, installation, maintenance, alteration, and inspection of mechanical systems. Compliance with these standards is mandatory, and work typically requires a permit from the local Authority Having Jurisdiction (AHJ) and must be performed by a licensed mechanical contractor.

Primary State Agency

The Michigan Department of Licensing and Regulatory Affairs (LARA), specifically through its Bureau of Construction Codes (BCC), is the primary agency responsible for the adoption, administration, and enforcement of the statewide construction codes. The Bureau oversees the development of these codes, manages contractor licensing, and provides guidance on code compliance and permitting processes across the state.

Resources to Learn More

Select a City in Bay County

If your project is located within incorporated city limits, you will likely need to follow municipal ordinances rather than county rules. Select your city below to view local regulations.

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