Cook County, IL Noise Ordinances: Construction Hours (2026)
Construction hours in Cook County, IL, sometimes called construction noise rules or contractor work-hour ordinances, set when contractors can run power tools, hammers, and heavy equipment.
Key Facts
- Allowed hours
- 7:00 a.m. to 8:00 p.m.
- Automatic exceptions
- emergency utility work, continuous dewatering pumps
- Off-hours work
- needs Dept. of Building and Zoning variance
- Applies in
- unincorporated Cook County only
- Minimum fine
- $1,000 per Sec. 1-10(c)
Summary
Unincorporated Cook County's Building Code confines construction work to the hours between 7:00 a.m. and 8:00 p.m., per Cook County Code § 102-104(5), carving out only emergency repairs to public utilities and the continuous pumps needed to dewater a job site, with any off-hours work allowed solely by a Commissioner-approved variance.
Hours of construction shall between the hours of 7:00 a.m. and 8:00 p.m., except for emergency work on public improvements or public utilities, and the operation of pumps when continuous pumping is necessary for removal of water from the construction area. A variance may be requested from the Department of Building and Zoning when it can be shown to the satisfaction of the Commissioner that construction outside these hours would be in the overall public interest or operationally essential, and for a limited time period.
Full Breakdown
Sec. for unincorporated Cook County, the same territorial limit fixed by Sec. ' The only built-in exceptions are emergency work on public improvements or public utilities and the operation of dewatering pumps where continuous pumping is necessary to remove water from the construction area. A contractor who needs to work outside the 7-to-8 window must apply for a variance from the Department of Building and Zoning; the Building Commissioner may grant it only on a showing that the off-hours work is 'in the overall public interest or operationally essential,' and even then only 'for a limited time period,' not as a standing exception.
The same subsection ties the site's required safety fencing to these hours: Sec. 102-104(4) requires that gates and doors in a construction site's perimeter fence be kept locked whenever the site is 'not within the permitted hours of construction stated in Subsection 102-104(5),' turning the daytime window into an enforceable site-security condition as well as a noise limit.
Violations & Fines
Running machinery, demolition, or other Code-covered construction outside 7:00 a.m.-8:00 p.m. without an approved Commissioner variance is a Code violation. Under the County's general penalty, Sec. 1-10(c), a conviction carries a fine of not less than $1,000.00, and because an ongoing after-hours job is a continuing violation, Sec. 1-10(c)(1) counts each day it continues as a separate offense, in addition to any stop-work order the Building Commissioner issues under Sec. 102-105.
Frequently Asked Questions
Can construction run past 8 p.m. in unincorporated Cook County?
Are there any automatic exceptions to the 7 a.m.-8 p.m. rule?
Does the Cook County construction-hours rule cover work inside Chicago?
Sources & Official References
Other rules in Cook County
How Cook County compares: Cities with the Strictest Construction Hours·Compare Cook County to another location·View the Illinois noise ordinances overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.