Illinois Landlord Maintenance and Repair Obligations

Every Illinois landlord must keep a residential rental fit to live in, a duty the Illinois Supreme Court applies to all residential leases. Under the state's Residential Tenants' Right to Repair Act, if you do not fix a problem within 14 days of a tenant's written notice, the tenant can hire the repair and deduct the cost from rent only if the reasonable cost of the entire repair is no more than the lesser of $500 or half a month's rent. In Chicago and suburban Cook County, local ordinances add more: larger repair-and-deduct limits, rent withholding, and a 24-hour deadline when heat or water is out.

Which repair rules apply to your rental?

Start with the location. The state rules apply everywhere in Illinois, and the Chicago and Cook County ordinances add to them for covered units.

Both ordinances exclude owner-occupied buildings with six or fewer units. The Cook County ordinance also excludes a single-family home or condo when it is the only unit the owner rents, the owner or an immediate family member lived there at least one month in the 12 months before marketing it, the owner personally manages it, and the owner is not a corporation. It does not apply in suburbs that have their own comprehensive landlord-tenant ordinance. A Cook County owner who relies on an exclusion must say so in marketing and application materials before taking any application fee.

What does the warranty of habitability require?

Outside the Chicago and Cook County ordinances, the main habitability duty comes from the courts. In Glasoe v. Trinkle (1985), the Illinois Supreme Court held that the implied warranty of habitability applies to all leases of residential property, whether or not a local housing code exists. The tenant is entitled to a unit fit for habitation for the whole tenancy.

A breach requires a defect serious enough to make the unit unsafe or unsanitary. Minor problems and inconveniences do not qualify, and courts decide case by case. The tenant must give you notice of the defect and a reasonable time to fix it. If you do not, the tenant owes only the unit's fair rental value in its defective condition, and can recover any rent paid above that amount. A tenant can raise this in an eviction case for unpaid rent, so an unrepaired serious defect can reduce or wipe out the rent a court awards you.

How does the state repair-and-deduct law work?

The Residential Tenants' Right to Repair Act covers repairs the lease or a law, rule, or local ordinance requires only when the reasonable cost of the entire repair is within the lesser of $500 or half a month's rent. Deducting only part of a more expensive repair does not make it eligible. The steps a tenant must follow are:

1. Confirm that the reasonable cost of the entire repair is within that limit.
2. Send written notice of the intent to have the repair made at your expense, by registered or certified mail or another restricted delivery service, to the address on the lease (or your last known address).
3. Wait 14 days, or less if conditions require it in an emergency. An emergency is a condition that will cause irreparable harm to the unit or its fixtures, or an immediate threat to anyone's health or safety in the unit or common areas.
4. Hire a tradesperson or supplier unrelated to the tenant who holds any required license and is adequately insured. The work must meet code.
5. Give you the paid bill, with the contractor's name, address, and phone number, and deduct no more than the bill, the cap, or the customary price for that repair.

Example: with rent of $1,400, half a month's rent is $700, so the state cap is the lesser amount, $500. With rent of $800, half is $400, so the cap is $400. In Chicago, the RLTO cap for the $1,400 unit is the greater amount, $700.

The tenant cannot use the Act for damage caused by the tenant, their family, or guests, and is responsible for any damage the hired contractor causes. A tenant who skips any step cannot use the withheld rent as a defense in an eviction. The Act does not apply to owner-occupied buildings with six or fewer units, condominiums, public housing, nonprofit housing co-ops, or mobile homes covered by the Mobile Home Landlord and Tenant Rights Act.

What does Chicago's RLTO add?

The RLTO requires you to keep the property in compliance with the Chicago Municipal Code and to promptly make any repairs needed to do so. Failing to maintain heat, hot water, plumbing, smoke detectors, locks, porches, or pest control are among the listed violations. When a covered unit is out of compliance, the tenant's remedies and notice requirements are:

• Repair and deduct minor defects after 14 days, up to the greater of $500 or half a month's rent, with a paid bill. The written notice must identify the defect and state the intent to repair it at your expense and deduct the cost.
• Withhold rent in an amount that reflects the unit's reduced value, starting after 14 days and continuing until the repair is made. The written notice must identify the defect and state the intent to withhold rent and the amount.
• End the lease for a defect that makes the unit not reasonably fit to live in, if you do not cure it by the termination date stated in the written notice. The notice must describe the defect and specify a termination date at least 14 days after you receive it. The tenant must move out within 30 days after that date, and you must return prepaid rent, the deposit, and interest.
• Sue for damages or a court order.

If you fail to supply heat, running water, hot water, electricity, gas, or plumbing, the clock is shorter. After written notice, the tenant can buy the service and deduct the cost, recover damages, or move to substitute housing and stop paying rent for that period. You may also owe reasonable substitute-housing costs up to the monthly rent, prorated for each month or part of a month of noncompliance. If you do not restore service within 24 hours, the tenant can withhold rent, and after 72 hours the tenant can end the lease by written notice. These remedies do not apply when the outage is the utility company's failure. Failing to provide heat at the levels and times the municipal code requires is also a listed RLTO violation, separate from a total loss of heat.

What does the Cook County RTLO add?

For covered units in suburban Cook County, the RTLO (in effect since June 1, 2021) requires a home that materially meets habitability standards. Your local building code sets the standard, or the Cook County Building Code where there is none. Specific duties include:

• Heat: from September 15 through June 1, at least 68 degrees from 8:30 a.m. to 10:30 p.m. and at least 66 degrees from 10:30 p.m. to 8:30 a.m.
• Bed bugs: the county says landlords must provide pest control for bed bugs within 10 days of notice and keep written records for 3 years. Our guide on what to do if your rental has bed bugs covers treatment and tenant cooperation.
• Tenant remedies: the written notice must identify the defects and state what the tenant will do if you do not fix them within 14 days after receipt. A withholding notice must announce withholding on the next rent payment date; the amount must reflect the reduced rental value. A repair-and-deduct notice must say the tenant will repair and deduct the cost from the next rent payment, up to the greater of $500 or half a month's rent. A termination notice must say the tenant will end the lease and move out. If the defects remain after 14 days, a tenant choosing termination must move out within one month after that period or by the end of the next rental period, whichever is longer.
• Essential services: if heat, running water, hot water, electricity, gas, plumbing, or internet access the lease promises is out for 24 hours after written notice identifying the service to restore, the tenant can withhold rent, buy the service and deduct it, recover damages, or get substitute housing. Substitute housing excuses rent during noncompliance, and you may also owe reasonable housing costs up to the monthly rent, plus reasonable fees. After 72 hours, the tenant can end the lease by written notice. These remedies exclude outages caused by a utility or internet provider's inability to supply service unless you caused that inability. They also exclude conditions caused deliberately or negligently by the tenant, their family, or anyone on the premises with the tenant's permission.

The county does not enforce the ordinance itself. Tenants enforce it by suing.

Can you respond to a repair request with a rent increase or eviction?

No. Under the Landlord Retaliation Act, effective January 1, 2025, you may not knowingly end a tenancy, raise rent, cut services, refuse to renew, or file or threaten a possession case because a tenant in good faith asked for repairs, complained to a code agency, or used a legal remedy such as repair and deduct. Evidence of protected activity within one year before your action creates a presumption of retaliation. You can defeat it by proving a legitimate, non-retaliatory reason, or that you started the action before the tenant's complaint. A tenant who proves retaliation can end the lease and recover the greater of 2 months' rent or twice the actual damages, plus attorney's fees.

To handle repair requests in a way that holds up:

1. Note the date each written notice arrives and which rules apply to the unit.
2. Treat a loss of heat or water as a 24-hour deadline in Chicago and suburban Cook County.
3. Give proper notice before entering to repair. See the Illinois landlord entry and access rules.
4. Keep invoices, photos, and messages showing when you fixed the problem.
5. Check any deduction against the paid bill and the cap that applies before you treat rent as unpaid. Filing for possession over a valid deduction invites a defense, as the Illinois eviction process explains.

When a defect is serious enough that a tenant leaves, our article on whether a tenant can move out due to bad conditions covers the general rules. The baseline duties every landlord has are in how much maintenance and repair is required by law.