Check smoke and CO alarms and swap expired battery smoke alarms for sealed units. Illinois landlords must install smoke and carbon monoxide alarms within 15 feet of every sleeping room, with working batteries at each move-in (plus a smoke alarm on every story of a single-family home, and CO alarms excused only in narrow all-electric cases), and any battery smoke alarm that is newly installed, failing, or more than 10 years past its manufacture date must be a sealed long-term battery or hardwired unit, so a yearly check catches expired alarms before a 90-day warning turns into fines of up to $100 every 30 days.
The Illinois rule
Each rule shows its schedule, its primary sources, and the date it was last verified.
Related rules in Illinois
The Illinois guide lists every compliance obligation, the seasonal maintenance calendar, and baseline upkeep.
Open the Illinois landlord guide · Smoke and carbon monoxide detector duties in every state
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This guide is the reading version of the Landautomate Illinois rule base. In the app, the same rules become dated tasks on each Illinois property, timed to its purchase date, lease dates, age, and climate, with an email before each one is due. The free preview shows a sample of that schedule for Illinois in under a minute, no account needed.
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