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Illinois · Building code

The building code in force in Illinois now.

No single state-written code; Capital Development Board Act baseline (Public Act 103-0510) effective Jan 1, 2025: IBC + IEBC (current or immediately preceding edition) apply where a municipality/county has no code, and adopted local codes must be at least as stringent. Enforced by Municipal and county building officials (local AHJs); Capital Development Board administers the statewide baseline, the 30-day code-adoption reporting requirement, the Illinois Energy Conservation Code (2024 IECC-based, effective Nov 30, 2025) and the Illinois Accessibility Code. Verified on the primary source, re-checked weekly.

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Building code in Illinois

Verified on the source
In force

No single state-written code; Capital Development Board Act baseline (Public Act 103-0510) effective Jan 1, 2025: IBC + IEBC (current or immediately preceding edition) apply where a municipality/county has no code, and adopted local codes must be at least as stringent

Since Jan 1, 2025, jurisdictions without a code default to IBC/IEBC (Chapters 11, 13, 29 replaced by the Illinois Accessibility, Energy Conservation and Plumbing Codes). The state does no plan review, permitting or inspection of privately funded projects.

Source: primary document

Who enforces it

Municipal and county building officials (local AHJs); Capital Development Board administers the statewide baseline, the 30-day code-adoption reporting requirement, the Illinois Energy Conservation Code (2024 IECC-based, effective Nov 30, 2025) and the Illinois Accessibility Code

Statewide layer. County and city amendments sit on top; the building view resolves them from your ZIP.

What changes next

In force

In force; 2026 Illinois Stretch Energy Code revision under development at CDB (voluntary municipal opt-in, no publication date); no statewide IBC edition change scheduled

Dated items

Next 24 months
Nov 1, 2026
Cook County: Annual Chicago facade 'short form' exterior-wall inspection reports due to the Dept. of Buildings for covered high-rises not undergoing a critical examination that yearChicago Dept. of Buildings / building owners
Dated
Dec 1, 2026
Cook County: Annual Chicago facade 'critical examination' exterior-wall inspection reports due to the Dept. of Buildings for covered high-risesChicago Dept. of Buildings / building owners
Dated
Jan 13, 2027
104th Illinois General Assembly adjourns sine die; 105th General Assembly convenes (second Wednesday of January) - watch for building, fire, elevator and lodging bills and the fall-2026 veto session outcomesIllinois General Assembly
Dated

Questions about the building code in Illinois

Which building code applies in Illinois today?

No single state-written code; Capital Development Board Act baseline (Public Act 103-0510) effective Jan 1, 2025: IBC + IEBC (current or immediately preceding edition) apply where a municipality/county has no code, and adopted local codes must be at least as stringent. Since Jan 1, 2025, jurisdictions without a code default to IBC/IEBC (Chapters 11, 13, 29 replaced by the Illinois Accessibility, Energy Conservation and Plumbing Codes). The state does no plan review, permitting or inspection of privately funded projects.

Who enforces the building code in Illinois?

Municipal and county building officials (local AHJs); Capital Development Board administers the statewide baseline, the 30-day code-adoption reporting requirement, the Illinois Energy Conservation Code (2024 IECC-based, effective Nov 30, 2025) and the Illinois Accessibility Code.

What changes next for the building code in Illinois?

Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.

Other areas in Illinois

Everything in force in Illinois
Fire codeNFPA 101 Life Safety Code (2015 edition) as adopted with state modifications in 41 Ill. Ad…ElevatorsElevator Safety and Regulation Act (225 ILCS 312) + 41 Ill. Adm. Code 1000 (amended effect…BoilersBoiler and Pressure Vessel Safety Act (430 ILCS 75) + 41 Ill. Adm. Code 2120 (recodified f…Pools and spasSwimming Facility Act (210 ILCS 125) and Swimming Pool Safety Act (210 ILCS 130) + Swimmin…Hotels and lodgingNo statewide hotel license or state lodging inspection program found; statewide hotel mand…Workplace safetyIllinois State Plan covers state and local government employees only; private employers (h…

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