# Illinois Building Codes: Local Adoption, No Statewide Residential Edition Illinois has no single statewide IRC edition — local jurisdictions adopt under a 2025 baseline law, and Chicago runs its own construction code entirely. - Canonical HTML: https://www.chippy.tools/building-codes/us/il/ - Publisher: Chippy Tools - Language: en - Updated: 2026-09-13 [Browse all topics](https://www.chippy.tools/building-codes/topics/)[Free web tools](https://www.chippy.tools/building-codes/tools/)[Printable references](https://www.chippy.tools/building-codes/printables/) [All countries](https://www.chippy.tools/building-codes/) [United States](https://www.chippy.tools/building-codes/us/) Topics Stairs - [California Guard Height: 42 Inches Under the CRC](https://www.chippy.tools/building-codes/us/ca/guard-height-42-inches/) - [IRC Stair & Guard Rules: Riser, Tread, Handrail, Guards](https://www.chippy.tools/building-codes/us/stairs/stair-and-barrier-requirements/) Footings - [US Footing Sizes & Frost Depth (IRC R403)](https://www.chippy.tools/building-codes/us/footings/footing-sizes-and-depth/) Room heights - [US Minimum Ceiling Heights (IRC R305)](https://www.chippy.tools/building-codes/us/rooms/minimum-ceiling-heights/) Ramps - [US Ramp Slopes (IRC R311.8)](https://www.chippy.tools/building-codes/us/ramps/ramp-gradients/) Wet areas - [Shower & Tub Wall Finish (IRC R307.2)](https://www.chippy.tools/building-codes/us/wet-areas/waterproofing-requirements/) By state - [Alaska](https://www.chippy.tools/building-codes/us/ak/) - [Alabama](https://www.chippy.tools/building-codes/us/al/) - [Arkansas](https://www.chippy.tools/building-codes/us/ar/) - [Arizona](https://www.chippy.tools/building-codes/us/az/) - [California](https://www.chippy.tools/building-codes/us/ca/) - [Colorado](https://www.chippy.tools/building-codes/us/co/) - [Connecticut](https://www.chippy.tools/building-codes/us/ct/) - [District of Columbia](https://www.chippy.tools/building-codes/us/dc/) - [Delaware](https://www.chippy.tools/building-codes/us/de/) - [Florida](https://www.chippy.tools/building-codes/us/fl/) - [Georgia](https://www.chippy.tools/building-codes/us/ga/) - [Hawaii](https://www.chippy.tools/building-codes/us/hi/) - [Iowa](https://www.chippy.tools/building-codes/us/ia/) - [Idaho](https://www.chippy.tools/building-codes/us/id/) - [Illinois](https://www.chippy.tools/building-codes/us/il/) - [Indiana](https://www.chippy.tools/building-codes/us/in/) - [Kansas](https://www.chippy.tools/building-codes/us/ks/) - [Kentucky](https://www.chippy.tools/building-codes/us/ky/) - [Louisiana](https://www.chippy.tools/building-codes/us/la/) - [Massachusetts](https://www.chippy.tools/building-codes/us/ma/) - [Maryland](https://www.chippy.tools/building-codes/us/md/) - [Maine](https://www.chippy.tools/building-codes/us/me/) - [Michigan](https://www.chippy.tools/building-codes/us/mi/) - [Minnesota](https://www.chippy.tools/building-codes/us/mn/) - [Missouri](https://www.chippy.tools/building-codes/us/mo/) - [Mississippi](https://www.chippy.tools/building-codes/us/ms/) - [Montana](https://www.chippy.tools/building-codes/us/mt/) - [North Carolina](https://www.chippy.tools/building-codes/us/nc/) - [North Dakota](https://www.chippy.tools/building-codes/us/nd/) - [Nebraska](https://www.chippy.tools/building-codes/us/ne/) - [New Hampshire](https://www.chippy.tools/building-codes/us/nh/) - [New Jersey](https://www.chippy.tools/building-codes/us/nj/) - [New Mexico](https://www.chippy.tools/building-codes/us/nm/) - [Nevada](https://www.chippy.tools/building-codes/us/nv/) - [New York](https://www.chippy.tools/building-codes/us/ny/) - [Ohio](https://www.chippy.tools/building-codes/us/oh/) - [Oklahoma](https://www.chippy.tools/building-codes/us/ok/) - [Oregon](https://www.chippy.tools/building-codes/us/or/) - [Pennsylvania](https://www.chippy.tools/building-codes/us/pa/) - [Rhode Island](https://www.chippy.tools/building-codes/us/ri/) - [South Carolina](https://www.chippy.tools/building-codes/us/sc/) - [South Dakota](https://www.chippy.tools/building-codes/us/sd/) - [Tennessee](https://www.chippy.tools/building-codes/us/tn/) - [Texas](https://www.chippy.tools/building-codes/us/tx/) - [Utah](https://www.chippy.tools/building-codes/us/ut/) - [Virginia](https://www.chippy.tools/building-codes/us/va/) - [Vermont](https://www.chippy.tools/building-codes/us/vt/) - [Western Australia](https://www.chippy.tools/building-codes/us/wa/) - [Wisconsin](https://www.chippy.tools/building-codes/us/wi/) - [West Virginia](https://www.chippy.tools/building-codes/us/wv/) - [Wyoming](https://www.chippy.tools/building-codes/us/wy/) Calculation guides - [Concrete Calculations: The Complete On-Site Guide](https://www.chippy.tools/building-codes/concrete/concrete-calculations-guide/) - [How to Calculate Concrete Volume for a Slab](https://www.chippy.tools/building-codes/concrete/concrete-volume-slab/) - [How Many Bags of Concrete Per m³? (20kg, 25kg, 40kg)](https://www.chippy.tools/building-codes/concrete/bags-of-concrete-per-m3/) - [Concrete for Post Holes: Volume Per Hole & Bags Needed](https://www.chippy.tools/building-codes/concrete/concrete-post-holes/) - [Concrete Mix Ratios Explained: 1:2:3, 1:2:4 & Water-Cement Ratio](https://www.chippy.tools/building-codes/concrete/concrete-mix-ratios/) - [Roof Pitch to Angle: Convert Rise/Run to Degrees & Grade](https://www.chippy.tools/building-codes/concrete/roof-pitch-to-angle/) - [Rafter Length Calculation: Run, Rise & Overhang](https://www.chippy.tools/building-codes/concrete/rafter-length/) - [Stair Rise & Run Setout: Riser, Going & the 2R+G Formula](https://www.chippy.tools/building-codes/concrete/stair-rise-and-run-setout/) - [How to Convert a Fall or Gradient: Ratio, Percentage & Degrees](https://www.chippy.tools/building-codes/concrete/fall-and-gradient-conversion/) - [Stud & Joist Spacing Takeoff: How Many at 400, 450 & 600 mm Centres](https://www.chippy.tools/building-codes/concrete/stud-and-joist-spacing-takeoff/) - [Gravel & Base Volume: Compacted Depth vs Loose-Fill Order Quantity](https://www.chippy.tools/building-codes/concrete/gravel-and-base-volume/) In this section [Browse all topics](https://www.chippy.tools/building-codes/topics/)[Free web tools](https://www.chippy.tools/building-codes/tools/)[Printable references](https://www.chippy.tools/building-codes/printables/) [All countries](https://www.chippy.tools/building-codes/) [United States](https://www.chippy.tools/building-codes/us/) Topics Stairs - [California Guard Height: 42 Inches Under the CRC](https://www.chippy.tools/building-codes/us/ca/guard-height-42-inches/) - [IRC Stair & Guard Rules: Riser, Tread, Handrail, Guards](https://www.chippy.tools/building-codes/us/stairs/stair-and-barrier-requirements/) Footings - [US Footing Sizes & Frost Depth (IRC R403)](https://www.chippy.tools/building-codes/us/footings/footing-sizes-and-depth/) Room heights - [US Minimum Ceiling Heights (IRC R305)](https://www.chippy.tools/building-codes/us/rooms/minimum-ceiling-heights/) Ramps - [US Ramp Slopes (IRC R311.8)](https://www.chippy.tools/building-codes/us/ramps/ramp-gradients/) Wet areas - [Shower & Tub Wall Finish (IRC R307.2)](https://www.chippy.tools/building-codes/us/wet-areas/waterproofing-requirements/) By state - [Alaska](https://www.chippy.tools/building-codes/us/ak/) - [Alabama](https://www.chippy.tools/building-codes/us/al/) - [Arkansas](https://www.chippy.tools/building-codes/us/ar/) - [Arizona](https://www.chippy.tools/building-codes/us/az/) - [California](https://www.chippy.tools/building-codes/us/ca/) - [Colorado](https://www.chippy.tools/building-codes/us/co/) - [Connecticut](https://www.chippy.tools/building-codes/us/ct/) - [District of Columbia](https://www.chippy.tools/building-codes/us/dc/) - [Delaware](https://www.chippy.tools/building-codes/us/de/) - [Florida](https://www.chippy.tools/building-codes/us/fl/) - [Georgia](https://www.chippy.tools/building-codes/us/ga/) - [Hawaii](https://www.chippy.tools/building-codes/us/hi/) - [Iowa](https://www.chippy.tools/building-codes/us/ia/) - [Idaho](https://www.chippy.tools/building-codes/us/id/) - [Illinois](https://www.chippy.tools/building-codes/us/il/) - [Indiana](https://www.chippy.tools/building-codes/us/in/) - [Kansas](https://www.chippy.tools/building-codes/us/ks/) - [Kentucky](https://www.chippy.tools/building-codes/us/ky/) - [Louisiana](https://www.chippy.tools/building-codes/us/la/) - [Massachusetts](https://www.chippy.tools/building-codes/us/ma/) - [Maryland](https://www.chippy.tools/building-codes/us/md/) - [Maine](https://www.chippy.tools/building-codes/us/me/) - [Michigan](https://www.chippy.tools/building-codes/us/mi/) - [Minnesota](https://www.chippy.tools/building-codes/us/mn/) - [Missouri](https://www.chippy.tools/building-codes/us/mo/) - [Mississippi](https://www.chippy.tools/building-codes/us/ms/) - [Montana](https://www.chippy.tools/building-codes/us/mt/) - [North Carolina](https://www.chippy.tools/building-codes/us/nc/) - [North Dakota](https://www.chippy.tools/building-codes/us/nd/) - [Nebraska](https://www.chippy.tools/building-codes/us/ne/) - [New Hampshire](https://www.chippy.tools/building-codes/us/nh/) - [New Jersey](https://www.chippy.tools/building-codes/us/nj/) - [New Mexico](https://www.chippy.tools/building-codes/us/nm/) - [Nevada](https://www.chippy.tools/building-codes/us/nv/) - [New York](https://www.chippy.tools/building-codes/us/ny/) - [Ohio](https://www.chippy.tools/building-codes/us/oh/) - [Oklahoma](https://www.chippy.tools/building-codes/us/ok/) - [Oregon](https://www.chippy.tools/building-codes/us/or/) - [Pennsylvania](https://www.chippy.tools/building-codes/us/pa/) - [Rhode Island](https://www.chippy.tools/building-codes/us/ri/) - [South Carolina](https://www.chippy.tools/building-codes/us/sc/) - [South Dakota](https://www.chippy.tools/building-codes/us/sd/) - [Tennessee](https://www.chippy.tools/building-codes/us/tn/) - [Texas](https://www.chippy.tools/building-codes/us/tx/) - [Utah](https://www.chippy.tools/building-codes/us/ut/) - [Virginia](https://www.chippy.tools/building-codes/us/va/) - [Vermont](https://www.chippy.tools/building-codes/us/vt/) - [Western Australia](https://www.chippy.tools/building-codes/us/wa/) - [Wisconsin](https://www.chippy.tools/building-codes/us/wi/) - [West Virginia](https://www.chippy.tools/building-codes/us/wv/) - [Wyoming](https://www.chippy.tools/building-codes/us/wy/) Calculation guides - [Concrete Calculations: The Complete On-Site Guide](https://www.chippy.tools/building-codes/concrete/concrete-calculations-guide/) - [How to Calculate Concrete Volume for a Slab](https://www.chippy.tools/building-codes/concrete/concrete-volume-slab/) - [How Many Bags of Concrete Per m³? (20kg, 25kg, 40kg)](https://www.chippy.tools/building-codes/concrete/bags-of-concrete-per-m3/) - [Concrete for Post Holes: Volume Per Hole & Bags Needed](https://www.chippy.tools/building-codes/concrete/concrete-post-holes/) - [Concrete Mix Ratios Explained: 1:2:3, 1:2:4 & Water-Cement Ratio](https://www.chippy.tools/building-codes/concrete/concrete-mix-ratios/) - [Roof Pitch to Angle: Convert Rise/Run to Degrees & Grade](https://www.chippy.tools/building-codes/concrete/roof-pitch-to-angle/) - [Rafter Length Calculation: Run, Rise & Overhang](https://www.chippy.tools/building-codes/concrete/rafter-length/) - [Stair Rise & Run Setout: Riser, Going & the 2R+G Formula](https://www.chippy.tools/building-codes/concrete/stair-rise-and-run-setout/) - [How to Convert a Fall or Gradient: Ratio, Percentage & Degrees](https://www.chippy.tools/building-codes/concrete/fall-and-gradient-conversion/) - [Stud & Joist Spacing Takeoff: How Many at 400, 450 & 600 mm Centres](https://www.chippy.tools/building-codes/concrete/stud-and-joist-spacing-takeoff/) - [Gravel & Base Volume: Compacted Depth vs Loose-Fill Order Quantity](https://www.chippy.tools/building-codes/concrete/gravel-and-base-volume/) [Building Codes](https://www.chippy.tools/building-codes/) [United States](https://www.chippy.tools/building-codes/us/) Illinois # Illinois Building Codes: Local Adoption, No Statewide Residential Edition Illinois has no single statewide IRC edition — local jurisdictions adopt under a 2025 baseline law, and Chicago runs its own construction code entirely. Illinois has **no single statewide IRC edition** for residential construction. Local jurisdictions adopt their own edition, and Illinois Public Act 103-0510 (effective 1 January 2025) only sets a floor — a local residential code must be at least as stringent as the current or immediately preceding IRC edition — without mandating a specific one. **Chicago** is the standout case: the city runs its own **Chicago Building Code**, authored and administered separately from any statewide code, rather than a straight IRC adoption. Because the operative edition is set locally, there’s no single “Illinois” figure for stair or guard geometry to cite here. Outside Chicago, most jurisdictions build from something close to the [IRC baseline](https://www.chippy.tools/building-codes/us/) — 7¾ in max riser, 10 in min tread, 6 ft 8 in headroom, 36 in min width, 34–38 in handrails, 36 in guards, the 30 in guard trigger and the 4 in sphere (see the [US stair & guard rules](https://www.chippy.tools/building-codes/us/stairs/stair-and-barrier-requirements/)) — but Chicago’s own code may differ, and any jurisdiction may have amended. Confirm the adopted edition and any amendments with your local building department. ## Adoption status Local Current code in force IRC (edition varies by jurisdiction) Next edition — Adoption / transition No single statewide IRC edition; local jurisdictions adopt. Public Act 103-0510 requires a statewide baseline effective 1/1/2025 — local residential codes must be at least as stringent as the IRC (current or immediately preceding edition), but the specific edition is set locally [Official source →](https://cdb.illinois.gov/business/codes/illinois-codes-faq.html) Last verified 2026-07-28 No state-specific variations recorded yet for this jurisdiction. This page is general information for tradespeople and is not compliance, engineering or legal advice. Requirements are subject to state and territory variations and adoption timing. Always confirm requirements with your building certifier and relevant state authority. ## Page directory ## Other languages - [es](https://www.chippy.tools/es/building-codes/us/il/index.md)