The state file is the first pass: licensing authority, reciprocity posture, workers' compensation threshold, bond notes, and renewal rules. It should not be treated as the final filing answer for a job site.
Cities and counties, especially Chicago and Cook County municipalities, control many contractor licenses, registrations, bonds, insurance minimums, and permit paths.
State trade credentials do not replace city or county permit requirements. Always confirm the local building department before bidding.
Primary licensing body
Illinois IDFPR; Illinois Department of Public Health; local building departments is the main statewide reference point for this file. County and municipal departments may still impose separate registration, permit, insurance, inspection, or bond requirements.
Source · State licensing authority · county building departmentsLast verified · 05 / 2026