Cook County, IL Earthquake Safety: Wood-Frame Retrofit (2026)
Strengthening rules for older multi-unit wood-frame buildings beyond standard soft-story compliance, including shear-wall and tie-down requirements.
Research in progress
We are currently verifying Cook County's specific local ordinance for wood-frame retrofit. In the meantime,Illinois state law generally applies, and below you'll find guidance for finding the official rules and links to related Cook County ordinances we've already verified.
Illinois State Law Context
Illinois state law provides the baseline framework for wood-frame retrofit across all municipalities in the state. Individual cities like Cook County may adopt additional local rules on top of state requirements, which is what makes checking your specific city ordinance important. For Cook County residents, the safest approach is to follow state law as a baseline and contact City Hall for any additional local requirements.
You can browse all Illinois earthquake safety to see how cities across the state regulate this topic.
How to find official Cook County Wood-Frame Retrofit rules
- Search for "Cook County IL municipal code" to find your city's online code portal (Municode, eCode360, or American Legal Publishing are the most common).
- Look for chapters covering earthquake safety, zoning, nuisance, or property maintenance — that's where most wood-frame retrofit rules live.
- Contact Cook County City Hall's code enforcement, planning, or community development department for clarification.
- Check with your HOA if applicable — many HOAs have stricter rules than the city itself.