Illinois Building code adoption
Home rule — cities adopt independently · 3 cities tracked · 0 with amendments.
Overview
Governance
Home Rule
Cities tracked
3
There is no binding state edition. Each city picks its own IBC/IRC/etc. cycle, which means a single metro can sit on 4+ different editions at once.
Adopted building codes (state level)
Home rule — cities adopt independently. Click a code to open its full adoption atlas across all 50 states.
City-level adoption
| City | IBC edition | Amendments | Note |
|---|---|---|---|
| Joliet | 2015 | — | — |
| Naperville | 2024 | — | — |
| Rockford | 2021 | — | — |
Quirks & watch-items
Quirks & watch-items
- Illinois has no statewide building code but as of Jan 1, 2025, local codes must regulate structural design at least as stringently as the IBC (Public Act 103-0510)
- Chicago has its own building code system — not a standard ICC adoption
- Joliet is on 2015 IBC — 2 cycles behind Rockford (2021) and 3 behind Naperville (2024)
- Naperville jumped to 2024 IBC as of Feb 2026 — one of the first IL cities
- State energy code (2024 IECC) is statewide eff Nov 30, 2025