Permit Requirements for Union, Michigan
For HVAC projects in Union, determining the correct permitting authority depends on whether the project site is located within the incorporated city limits or in an unincorporated area of Cass County.
Authority Having Jurisdiction (AHJ)
Most jurisdictions require permits for HVAC work to ensure safety and code compliance. The governing body responsible for issuing these permits varies by specific location:
General HVAC Guidelines
Permits are usually required for new installations, structural modifications, or major repairs. While minor maintenance or cosmetic updates may be exempt, landowners should always verify local codes before work begins.
Help Us Improve This Guide
If you have found a direct link to a permit portal or a specific local ordinance for HVAC in this area, please submit an update.
Because Union is located within Cass County, the following broader county regulations may also apply to your project:
Michigan, Cass County Hvac Permit Regulations and County Ordinances for Unincorporated Areas
HVAC Permit Requirements in Cass County, Michigan
In Cass County, Michigan, building, mechanical, plumbing, and electrical permits are not administered at the county level. Instead, these permits are administered directly by the local unit of government—specifically the township, village, or city—in which the property is located.
Rules for Properties in Unincorporated Areas
For properties located in unincorporated areas (townships), you must contact the specific township office to determine the correct procedure for obtaining a mechanical (HVAC) permit. Because enforcement is handled locally, requirements, application forms, and inspection processes can vary between different townships within the county. It is the responsibility of the applicant or the hired contractor to identify the appropriate local authority, submit the required applications, pay the associated fees, and schedule all necessary inspections before any work is concealed or covered.
Resources to Learn More
The following statewide building codes and regulations apply universally to all jurisdictions within Michigan:
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