Decatur, Illinois Roofing Local Permit Ordinances and Codes
Decatur, Illinois Roofing Permit Ordinances
The City of Decatur's Building Inspections division is the Authority Having Jurisdiction for roofing permits. They are responsible for reviewing building plans, issuing permits, and conducting inspections to ensure construction meets standard codes and safety requirements.
Permits can be applied for online through the City of Decatur's OpenGov platform. This system also allows for the application of Public Works permits, such as Land Disturbance permits and Right-of-Way permits.
Zoning and Fee Nuances
The City of Decatur has specific fee schedules for building permits, which are updated periodically. For general construction, fees are often based on a percentage of the project value, with minimum amounts specified. For example, residential permits may be 0.5% of the project value (minimum $50), and commercial permits may be 0.75% of the project value (minimum $150).
There are also specific fees for different types of work, such as demolition, signs, and swimming pools.
Plan review fees are also applicable, with different rates for residential and commercial projects.
It's important to note that the "Project Value" used for fee calculation includes materials, labor, and site improvements, and is subject to review by the building official.
Mixed-use developments are subject to commercial fees.
The city also has a "Permit Fee Schedule" and a "Zoning Fee Schedule" available, which detail the costs associated with various permits and zoning-related applications.
Work done without a permit can result in double the required fee.
The City of Decatur enforces current building codes, including the 2021 International Building Code and the 2021 International Residential Code, among others.
Resources to Learn More
Because Decatur is located within Macon County, the following broader county regulations may also apply to your project:
Macon County, Illinois Roofing Permit Regulations and County Ordinances for Unincorporated Areas
Macon County Building & Safety Jurisdiction
In Macon County, Illinois, the Planning & Zoning Department is responsible for administering ordinances and issuing building permits for projects located in the unincorporated areas of the county. This department enforces the International Building Code for new construction and remodel projects outside of incorporated cities, villages, and towns. Because building permit requirements can vary significantly depending on the specific location and the scope of the work, property owners should contact the Macon County Planning & Zoning Department directly to verify if a permit is required for their specific roofing project before beginning any work.
Rules for Properties in Unincorporated Areas
For properties located in unincorporated Macon County, a building permit must be obtained before work begins. Failure to obtain a required permit can result in doubled permit fees, the issuance of a stop-work order, or other legal complications. It is important to note that while the county oversees unincorporated areas, incorporated municipalities within the county (such as the City of Decatur or the Village of Mt. Zion) maintain their own separate building departments and permitting processes. If your property is within an incorporated area, you must follow the regulations of that specific municipality rather than the county's.
Resources to Learn More
The following statewide building codes and regulations apply universally to all jurisdictions within Illinois:
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.
Resources to Learn More