What building code does Illinois use?
Illinois currently enforces International Building Code, 2024 edition (statewide 2024 code cycle). Cities and counties in Illinois may adopt local amendments.
Adopted codes — 2024 cycle
| Scope | Code | Edition |
|---|---|---|
| Building | International Building Code | 2024 |
| Residential | International Residential Code | 2024 |
| Mechanical | International Mechanical Code | 2024 |
| Energy | Illinois Energy Conservation Code | 2021 |
| Existing Building | International Existing Building Code | 2024 |
Other active cycles
Illinois lists more than one active cycle with ICC — projects may be permitted under either depending on submission date and local adoption.
2021 cycle (also active)
| Scope | Code | Edition |
|---|---|---|
| Building | International Building Code | 2021 |
| Residential | International Residential Code | 2021 |
| Fire | International Fire Code | 2021 |
| Mechanical | International Mechanical Code | 2021 |
| Plumbing | International Plumbing Code | 2021 |
| Energy | International Energy Conservation Code | 2021 |
| Existing Building | International Existing Building Code | 2021 |
| Fuel Gas | International Fuel Gas Code | 2021 |
| Property Maintenance | International Property Maintenance Code | 2021 |
| Private Sewage | International Private Sewage Disposal Code | 2021 |
| Pool & Spa | International Swimming Pool and Spa Code | 2021 |
| Wildland-Urban Interface | International Wildland-Urban Interface Code | 2021 |
| Zoning | International Zoning Code | 2021 |
Get this data as JSON
curl https://codes.submittal.app/api/v1/states/illinois.jsonEvery page on this site is backed by the open building-codes dataset (CC BY 4.0). Source: ICC code-adoption records, retrieved 2026-04-28.