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Illinois Remodeler Legislation, Codes, and Guidelines

Illinois State Building Codes and Legislation for Remodelers and Residential Renovations

Illinois has recently enacted significant changes to its building code structure, aiming for statewide uniformity. As of January 1, 2025, Public Act 103-0510 mandates that all municipalities and counties must adopt building codes that meet the minimum standards set by the International Code Council (ICC). This includes the International Building Code (IBC), the International Existing Building Code (IEBC), and the International Residential Code (IRC). Local governments have until June 1, 2025, to ensure their codes align with these statewide requirements. For jurisdictions that have not adopted a building code, builders and homeowners must still adhere to a "baseline" code, which aligns with ICC standards from the 2018, 2021, or 2024 editions. Areas with existing codes must ensure their standards are at least as stringent as those established by the ICC within the last nine years.

The primary state agencies involved in setting and enforcing these standards include the Illinois Capital Development Board (CDB), which oversees the statewide code implementation, and the Illinois Department of Financial and Professional Regulation (IDFPR), which provides guidance for building code enforcement officials and design professionals.

For residential renovations, the International Residential Code (IRC) is generally applicable. The International Existing Building Code (IEBC) is relevant for alterations, repairs, and additions to existing structures. While the state has not adopted a specific statewide building code for repairs to existing single-family residences, local Authorities Having Jurisdiction (AHJs) may regulate these repairs.

The Illinois Home Repair and Remodeling Act (HRRA) provides consumer protections for residential projects. This act requires a written contract for any home repair or remodeling work exceeding $1,000, detailing the total cost, parts, materials, and contractor information. For projects costing $1,000 or less, contractors must provide a "Home Repair: Know Your Consumer Rights" pamphlet.

Generally, cosmetic remodels that do not alter the structure or systems of a building may not require permits. However, structural alterations, such as converting attics or basements to habitable spaces, removing load-bearing walls, or significant electrical or plumbing updates, typically require permits and adherence to building codes.

Demolition guidelines in Illinois involve obtaining necessary permits from local authorities and potentially the Illinois Environmental Protection Agency (IEPA), especially if hazardous materials are involved. Specific requirements for demolition permits, including timelines and recycling of construction debris, can vary by municipality. For instance, Chicago requires a demolition permit for altering a building that permanently reduces its area.

Resources to Learn More

Select a County Below to Learn More About That Jurisdiction in Illinois

Permit rules operate within the above structure but can be nuanced at the county or municipal level. Select your local area below for specific ordinances, local codes, and direct links for your locality Building Department.