Energy
State Edition
Illinois Energy Conservation Code
Adopted from:2024 International Energy Conservation Code (IECC)
Effective PeriodHome Rule
Building Codes by State & Jurisdiction
Select any state to instantly see which building codebooks apply – including the adopted base code, effective period, and amendments.
Energy
State Edition
Illinois Commercial Stretch Energy Code Based on ASHRAE 90.1-2022
Adopted from:2024 International Energy Conservation Code (IECC)
Effective PeriodHome Rule
Energy
State Edition
Illinois Stretch Energy Code
Adopted from:2021 International Energy Conservation Code (IECC)
Effective PeriodHome Rule
Residential
As is
International Residential Code
Adopted from:2018 International Residential Code (IRC)
Effective PeriodHome Rule
Fire
As is
International Fire Code
Adopted from:2018 International Fire Code (IFC)
Effective PeriodHome Rule
Building
As is
International Existing Building Code
Adopted from:2018 International Existing Building Code (IEBC)
Effective PeriodHome Rule
MEP
As is
International Fuel Gas Code
Adopted from:2018 International Fuel Gas Code (IFGC)
Effective PeriodHome Rule
Building
As is
International Building Code
Adopted from:2018 International Building Code (IBC)
Effective PeriodHome Rule
Building
As is
International Swimming Pool and Spa Code
Adopted from:2018 International Swimming Pool and Spa Code (ISPSC)
Effective PeriodHome Rule
MEP
As is
International Mechanical Code
Adopted from:2018 International Mechanical Code (IMC)
Effective PeriodHome Rule
MEP
As is
Natinal Electrical Code
Adopted from:2017 NFPA 70 National Electrical Code (NFPA 70)
Effective PeriodHome Rule
People also ask
Illinois has adopted 11 active building codes, including editions of the Illinois Energy Conservation Code, Illinois Commercial Stretch Energy Code Based on ASHRAE 90.1-2022, Illinois Stretch Energy Code. Use the list above to verify the specific year and edition for your project.
Yes, Illinois is a Home Rule jurisdiction. This means building code adoption and enforcement are primarily managed at the local level (city or county) rather than by a single state agency.
Most states, including Illinois, review and adopt new building code editions every 3 to 6 years, typically following the triennial publication cycles of the ICC and NFPA.
Illinois's current building code adoption is based on the 2024 edition cycle. Check the code cards above for specific edition years for each code type (IBC, IRC, IFC, etc.).
Illinois allows local jurisdictions to adopt their own amendments. The amendment type for each code is indicated by the badge (As Is, State Amended, or State Edition) on each code card above.
Permit requirements in Illinois depend on the locally adopted building codes shown above. Contact your local building department for specific permit thresholds and submittal requirements. The code edition in effect on your permit application date determines which requirements apply to your project.