Cook County, IL Fire Regulations: Smoke Detectors (2026)
Key Facts
- Habitability item
- Sec. 42-105(c)(3)d smoke alarms/detectors
- Reference code, unincorporated areas
- Cook County Building Code § 102-102
- Cure window before remedy
- 14 days after written notice
- Applies to
- Countywide rentals, minus opted-out municipalities
- Ordinance source
- Ord. No. 20-3562, 1-28-2021
Summary
Under the Cook County Residential Tenant and Landlord Ordinance, a rental unit isn't legally habitable unless it has the right number of smoke alarms, smoke detectors, and fire alarm systems in accessible locations: measured against the applicable municipal building code, or the Cook County Building Code in unincorporated areas.
Sec. 42-105. - Tenant rights. ... (c)Tenant right to dwelling that materially complies with habitability. ... (2)Where the property is in a municipality that has adopted a municipal building code, the landlord and tenant may use that municipal code as reference for determining habitability standards. Where the property is in in a municipality that has not adopted a municipal building code or is in unincorporated Cook County, the landlord and tenant may use the Cook County Building Code, Section 102-102, et seq., as reference for determining habitability standards. (3)Habitability standards shall include, but are not limited to, any of the following circumstances: ... d.Appropriate number, location and accessibility of smoke alarms, smoke detectors, sprinkler systems, standpipe systems, fire alarm systems, automatic fire detectors, and fire extinguishers;
Full Breakdown
Sec. " Subsection (c)(2) sets the reference standard: where the property sits in a municipality with its own building code, that municipal code defines what's adequate; where the municipality has no building code, or the unit is in unincorporated Cook County, the parties look instead to the Cook County Building Code at Sec. 102-102 et seq. This habitability duty runs alongside dozens of other structural items in the same list, working electrical systems, adequate heat, sound floors and stairways, so a missing or nonfunctional smoke alarm is treated the same as a structural defect for enforcement purposes.
Sec. 42-101(d) makes this Article apply countywide to residential buildings, but it excludes any city, village, or incorporated town that maintains its own tenant-landlord ordinance covering both rights and remedies (Chicago's own code is separate and outside this Article). Landlords must also give tenants a written notice disclosing any code violations cited against the unit in the previous 12 months before signing or renewing a lease, under Sec. 42-110(c).
Violations & Fines
A tenant whose unit lacks required smoke alarms can invoke the full remedy menu in Sec. 42-106 once the landlord fails to fix the noncompliance within 14 days of written notice: withhold rent in an amount reflecting the reduced value of the unit, terminate the lease, or sue for damages and injunctive relief, with the landlord losing the defense that the condition was caused by the tenant. A tenant who wins a civil case establishing a section 42-110 disclosure violation can recover one month's rent or actual damages, whichever is greater, plus attorney's fees.
Frequently Asked Questions
Does Cook County's tenant ordinance require smoke detectors in rentals?
What building code sets the smoke alarm standard for unincorporated Cook County?
What can a tenant do if the landlord won't install a working smoke alarm?
Does this smoke-alarm rule apply to a Chicago apartment?
Sources & Official References
Other rules in Cook County
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