Union County, Illinois Roofing Permit Regulations and County Ordinances for Unincorporated Areas
Roofing Permit Requirements in Union County, Illinois
In Illinois, there is no uniform, statewide building code that dictates permit requirements for all jurisdictions. Consequently, building permit regulations, including those for roofing projects, are determined at the local level by individual counties and municipalities. Property owners in Union County should contact the county offices directly to confirm current requirements for their specific location, as regulations can vary based on the scope of the work and the specific zoning of the property.
Permits for Unincorporated Areas
For properties located in unincorporated areas of Union County, the county government serves as the primary authority for building regulations. While some minor repairs may be exempt, significant roofing projects—such as complete replacements or structural modifications—often require a building permit. It is essential to verify whether your project requires a permit before beginning any work to ensure compliance with local ordinances and to avoid potential fines or complications during future property transactions.
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Note: The following state-wide building codes and regulations apply universally to all jurisdictions within Illinois, including Union County.
Illinois Roofing Legislation, Codes, and Guidelines
State-Level Building Codes and Legislation for Roofing in Illinois
As of January 1, 2025, Illinois has implemented a statewide baseline building code requirement pursuant to Public Act 103-0510, which amended the Capital Development Board Act. This legislation mandates that all municipalities and counties in Illinois must adopt and enforce building codes that meet or exceed the minimum structural requirements of the International Code Council (ICC) standards, specifically the International Building Code (IBC) and the International Residential Code (IRC). Prior to this, Illinois did not have a unified statewide building code, and regulations were determined entirely at the local municipal or county level.
While the state now requires a baseline, local jurisdictions retain the authority to adopt their own specific editions (such as the 2018, 2021, or 2024 editions) and implement local amendments, provided those amendments do not reduce the structural requirements below the state-mandated baseline. Consequently, specific roofing requirements—such as those for ice and water shields, ventilation, and shingle layering—can still vary significantly between different cities, villages, and counties. Property owners and contractors must consult their local Authority Having Jurisdiction (AHJ) to confirm the specific code edition and local amendments applicable to their project.
Primary State Agency
The Illinois Capital Development Board (CDB) is the primary state agency responsible for the administration of the state's building code framework. Under the Capital Development Board Act (20 ILCS 3105), the CDB is tasked with identifying and publishing local building codes and ensuring that municipalities and counties comply with the requirement to report their adopted codes and amendments to the state.
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