Important: Homzora is a housing research publisher, not a law firm, and nothing on this page is legal advice. This article is general information about the law as published by government and court sources at the time of writing, and it may not reflect later changes or the facts of your situation. Reading it does not create an attorney and client relationship. For advice about your situation, contact a licensed attorney or a legal aid organization in your state.
About 54.0 percent of occupied homes in the city of Chicago are rented, since the Census Bureau puts the owner occupied housing rate at 46.0% for 2020 to 2024, and the median gross rent is $1,440 a month (U.S. Census Bureau QuickFacts, Chicago). Working smoke and carbon monoxide alarms are some of the most important safety features in any rental, and most states set rules on who must install and maintain them.
This guide explains what Illinois law and any local rules in Chicago require for smoke and carbon monoxide alarms, what landlords and tenants must each do, and what to do if an alarm is missing or broken.
What Illinois law says
Illinois’s Carbon Monoxide Alarm Detector Act requires every dwelling unit to have at least one approved CO alarm (NCSL, Carbon Monoxide Detector Installation Statutes (updated Sept. 29, 2025), 430 ILCS 135/10). Illinois requires every dwelling unit to have at least one working smoke detector within 15 feet of every room used for sleeping (425 ILCS 60/3(a)). In Illinois the owner must supply and install all required smoke detectors, and must make sure batteries work when the tenant moves in; after that, the tenant replaces batteries (425 ILCS 60/3(d)).
Since January 1, 2023, a battery powered smoke detector in Illinois must use a self contained, non removable, long term battery when the detector is newly installed, more than 10 years old, or malfunctioning; hardwired units and certain monitored or wireless connected units are treated differently (425 ILCS 60/3(e) (P.A. 100-200, eff. 1-1-23)). Willfully failing to install or maintain a required smoke detector in Illinois is a Class B misdemeanor; tampering with a detector or its batteries is a Class A misdemeanor for a first offense (425 ILCS 60/4 (P.A. 100-200)). Illinois requires at least one working carbon monoxide alarm within 15 feet of every room used for sleeping in every dwelling unit (unless the building has no fossil fuel source, attached garage, or nearby CO source) (430 ILCS 135/10(a)).
The Illinois owner must supply and install required CO alarms and give one tenant per unit written information on testing and maintenance; the tenant must test and maintain the alarms and notify the owner in writing of deficiencies the tenant cannot fix (430 ILCS 135/10(c)).
Free help in Chicago
Cook County Legal Aid for Housing and Debt offers free help at 855.956.5763 (Cook County Legal Aid for Housing and Debt). For other services, call 211 (211.org).
Test your alarms at move in
- Press the test button on every smoke and carbon monoxide alarm the day you move in.
- Note where each alarm is located and whether any room seems to be missing one.
- Check the date printed on the back; most alarms need replacement about 10 years after manufacture.
- Report any missing or failed alarm to the landlord in writing the same day.
- Keep a dated photo of each alarm.
Where alarms usually belong
Building and fire codes generally call for smoke alarms inside and outside sleeping areas and on each level of a home, and carbon monoxide alarms near sleeping areas in homes with fuel burning appliances or an attached garage. The exact rules depend on the law where you live and when the building was built or renovated, as described above. If you are unsure whether your unit has enough alarms, ask the landlord or your local fire department.
A sample request
Date: 2026. To: [landlord]. Re: Alarms at [address]. The [smoke] [carbon monoxide] alarm in [location] [does not work] [is missing]. Please [repair] [install] it as soon as possible and tell me when it will be done. Sincerely, [name].
Send it in a way you can prove and keep a copy.
Your responsibilities as a tenant
- Do not remove, disconnect, or cover an alarm, even when cooking.
- Test alarms monthly and replace batteries if your lease or local law makes that your job.
- Report a chirping, beeping, or failed alarm promptly in writing.
- Never paint over an alarm or hang decorations on it.
Carbon monoxide basics
Carbon monoxide is a colorless, odorless gas produced by burning fuel. Furnaces, water heaters, gas stoves, fireplaces, and vehicles in attached garages can all produce it. Symptoms of exposure can include headache, dizziness, nausea, and confusion. If a carbon monoxide alarm sounds, leave the home right away, get to fresh air, and call 911 or the fire department from outside. Do not go back in until responders say it is safe.
Fire safety habits
- Keep a clear path to every exit and know two ways out of each room when possible.
- Never leave cooking unattended.
- Use space heaters only as the manufacturer directs and keep them away from bedding and curtains.
- Plan a meeting place outside and practice with everyone in the home.
- Keep the fire department number and your address handy for guests and sitters.
Renters insurance
Renters insurance can help replace belongings and cover liability after a fire. Some insurers ask whether the home has working smoke alarms, and some offer discounts for them. Keep proof of your coverage and your alarm tests with your lease.
Mistakes to avoid
- Disabling a nuisance alarm. Ask the landlord to move or replace it instead.
- Assuming someone else reported a problem. Report it yourself in writing.
- Ignoring the end of life chirp. Many alarms chirp when they need replacement, not just a new battery.
Build your evidence file
Landlord and tenant disputes are usually decided by documents. Keep these together from the day you sign:
- The signed lease, every addendum, and every renewal.
- Receipts or bank records for the deposit and each rent payment.
- Dated photos and video of every room at move in and move out.
- Copies of every repair request and the landlord’s replies.
- Every notice you send or receive, with proof of delivery.
Keep copies somewhere other than your phone, such as an email to yourself, so they survive a lost device.
Fair housing
The federal Fair Housing Act prohibits discrimination in rental terms because of race, color, religion, sex, familial status, national origin, or disability (42 U.S.C. § 3604). HUD accepts complaints (HUD, File a Complaint).
Hearing impaired residents
Standard alarms rely on sound. People who are deaf or hard of hearing may need alarms with strobe lights or bed shakers. A tenant can ask the landlord in writing to allow or provide these devices as a reasonable accommodation, and some local fire departments offer them at low or no cost.
After a fire or false alarm
If an alarm went off because of a real fire, call 911 first and only then contact the landlord and your insurer. After any alarm activation, test the device again and replace it if it was damaged. Write down what happened and when, and keep photos of any damage.
Types of smoke alarms
Smoke alarms commonly use ionization sensors, photoelectric sensors, or both. Fire safety organizations often recommend having both kinds of protection because each responds faster to different types of fire. Some alarms are hardwired into the building with a battery backup, and others run only on batteries, including sealed batteries designed to last about 10 years. Interconnected alarms sound together, so a fire in one room sets off alarms everywhere. Ask the landlord which type your unit has.
What chirping means
A single chirp every minute or so usually means a low battery. Repeated chirping after a new battery can mean the alarm has reached the end of its life and needs replacement. Some carbon monoxide alarms use different beep patterns for an emergency, a low battery, and end of life, so read the label on the device. Report any chirping alarm in writing if replacing it is the landlord’s job.
Keep an equipment information folder
A small equipment information folder can make a question about an alarm easier to describe. Record the device location and any model information already available in the supplied paperwork or other safely accessible records. Save the manufacturer’s instructions for the exact model rather than a manual for a similar looking product. Do not remove equipment, open electrical components, or climb unsafely simply to complete a list.
Keep the source of each date clear. A date on a receipt, a date written in a service note, and a date printed on a device are different pieces of information. If you do not know what a particular date represents, record it as an unresolved question rather than treating it as an installation or replacement date. This avoids a tidy looking inventory that contains assumptions nobody has checked.
Use a separate communication log for questions and service visits. Record the issue described, whom you contacted, the reference number if supplied, and the written response. If someone provides instructions, retain those instructions with the corresponding model information. A household reminder should refer back to that material; it should not replace the instructions with a generic schedule copied from a different product.
For a hypothetical household with several devices, each location can have a separate row so that a question about one device is not accidentally attributed to another. Before passing the folder to another household member, check that the manual links still identify the intended model. The U.S. Fire Administration links below provide a starting point for smoke alarm information. This recordkeeping exercise does not certify that equipment works, determine a building’s compliance, or replace an immediate response to an alarm or other urgent situation. Follow the applicable emergency and manufacturer guidance rather than treating an inventory as reassurance.
Use the U.S. Fire Administration smoke alarm information alongside the instructions for the particular device.
For related practical planning, visit the city housing hub.
Frequently asked questions
Who replaces smoke alarm batteries in Chicago?
It depends on state and local law and the lease, as described above. Many laws require the landlord to provide working alarms at move in and make tenants responsible for testing or batteries during the tenancy.
What if my unit has no carbon monoxide alarm?
Check the rules above for your state and city, then ask the landlord in writing. If your home has gas appliances or an attached garage, a working carbon monoxide alarm is an important safety device regardless of the law.
Can I be charged for an alarm?
Some places allow limited charges, as described above where they apply. Ask the landlord to explain any charge in writing.
Legal notice
Homzora is not a law firm and does not provide legal advice. Laws, court rules, and local programs change, and how they apply depends on your facts. Before you act on anything in this article, confirm the current rules with the court, a licensed attorney, or a legal aid organization.
Sources
- U.S. Census Bureau QuickFacts, Chicago
- NCSL, Carbon Monoxide Detector Installation Statutes (updated Sept. 29, 2025), 430 ILCS 135/10
- 425 ILCS 60/3(a)
- 425 ILCS 60/4 (P.A. 100-200)
- 430 ILCS 135/10(a)
- Cook County Legal Aid for Housing and Debt
- 211.org
- 42 U.S.C. § 3604
- HUD, File a Complaint