Roommate Clause
in Your Lease
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Statutes verified against primary state sources
Every statute cited here was read in its published text before this page went live: on the state's own site where that site can be reached, otherwise on a republished copy of the code. Court decisions are quoted from the published opinion and linked to it, so you can read the original yourself.
Primary sourcesNot legal advice
Content verified against primary state statutes before publicationLast updated: October 2026
What it actually means, what Illinois law says, what's specific to Chicago - and exactly what to do. In plain English.
Quick Summary - What You Need to Know
- No Illinois statute in our record gives you a right to add a roommate or sets a notice deadline.
- Your lease decides who may live in the unit and how a new roommate gets approved.
- Everyone who signs is jointly and severally liable, so one roommate can owe the entire rent.
- Chicago's RLTO requires your landlord to accept a reasonable subtenant you offer, with no extra fees.
- Small owner-occupied buildings sit outside the RLTO, so check whether your building is covered.
Copy and send: Before the new person moves in, once you have read your lease's roommate clause
Ask to add a roommate
Fill in the brackets and keep a copy of what you send.
How Illinois compares
Deadline to notify the landlord of a new roommate, state by state
30 daysNo figureGuide coming soonYou are here
See all 25 cities as a chart
Figures are the state rule, or the stronger city ordinance where one exists. Verify the current law for your own situation before relying on it.
Understanding the Roommate Clause
This page is for Chicago renters who want to add a roommate, or already share a lease, and need to know what the landlord can require. Our Illinois record has no state roommate statute, which leaves the lease you signed as the document that sets approval, timing and fees.
Chicago adds one tool, the RLTO's rule on accepting a reasonable subtenant, which helps when a roommate leaves. The rent split can surprise you: each signer can owe all of it.
What renters assume
Once a roommate moves out, their half of the rent stops being your problem.
What is actually true
Everyone who signs is normally jointly and severally liable, so your landlord can collect the entire rent from whoever stays. A release the landlord signs is what changes who owes what.
Illinois lands with the no statute states, and the gap is real. A New York renter can move someone in and just notify the landlord within 30 days, while a Seattle tenant can't be refused immediate family at all.
In Chicago the only thing between you and a flat no is your lease wording, plus the RLTO's sublet rule.
Roommate Clause Example - What the Wording Looks Like in Chicago, IL
The sample clause below is real lease language - a court quoted it word for word, and then ruled on it. What the judge decided is at the bottom of this block.
Find the equivalent paragraph in your own lease and read the two side by side. The wording will differ; the moving parts rarely do.
The paragraph in the original lease opens with the sentence below and then continues into matters this page does not reach.
REIMBURSEMENT. You must promptly reimburse us for loss, damage, or cost of repairs or service caused anywhere in the apartment community by your or any guest's or occupant's improper use or negligence. […]
Quoted from the published opinion in Churchill Forge, Inc. v. Brown, 61 S.W.3d 368 (Tex. 2001). Judicial opinions are not subject to copyright; the lease language is reproduced in limited part for commentary under 17 U.S.C. § 107.
What the 4 highlighted phrases mean
“must promptly”
The lease's own clock, with no Illinois clock in our record to measure it against. What Chicago gives you instead is a route out rather than a deadline: under the Residential Landlord and Tenant Ordinance a landlord must accept a reasonable subtenant you offer, and may not charge extra fees for it. That is a tool for ending an exposure like this one, not for slowing it down.
“damage, or cost”
This is the money the ordinance does not touch. The RLTO's reach on this page is the replacement tenant - accept a reasonable one, charge no extra fee for it - and our Illinois record carries no rule about what a reimbursement paragraph may bill. The number that arrives is governed by the lease and by what the landlord can document.
See the example
“caused”
Everything on this page hangs off causation, and it is the one thing a roommate dispute is usually short of evidence on. The clause does not ask you to prove your innocence. It asks the landlord to say the loss came from improper use or negligence on your side of the door, and where nobody can say who did what, that question does the work.
See the example
“or occupant's”
The word covers the roommate who never signed. Our Illinois record contains no statute on additional occupants and none on co-tenant liability, and the joint and several liability that lets a landlord collect the whole rent from one roommate comes from the contract you signed. In Chicago the ordinance still leaves you the replacement route, and its reasonable-subtenant standard is aimed at a landlord who would rather simply refuse.
See the example
The co-signer's defence failed. JoAnn Brown signed an apartment lease as a cotenant with her adult son. He was alleged to have started a fire that damaged the complex, the landlord sued only her, and she argued she could not be charged for damage she had not caused. The Texas Supreme Court disagreed, reversed the summary judgment she had won and held this sentence enforceable against a cotenant who was not herself negligent. The route ran through two sections. Tex. Prop. Code § 92.052(b) gives a landlord no duty to repair damage caused by the tenant, an occupant or a guest, so § 92.006(e) had no repair duty to stop the parties contracting over; and the fair-notice doctrine did not apply, because the sentence does not shift the landlord's own negligence onto the tenant. The court added that neither statute, common law nor the Restatement bars “requiring a tenant to reimburse the landlord for damages negligently caused by the tenant or one occupying the premises with the tenant's consent.” A dissent would have held the sentence unenforceable outright because it was not underlined or conspicuous, as § 92.006(e)(4) requires. This is 2001 Texas law, decided on the Texas Property Code - state-specific, and not a national rule.
How this state's law treats this clause
One court, one lease, one state. That answer is not automatically yours, and your lease may be worded to land differently. Use this to know what to look for and what to ask - your state's tenant hotline or a local tenant attorney can answer it for your document.
Illinois Law on Roommate Clause
- No Illinois statute in our record gives tenants a right to add a roommate or sets a landlord response deadline.
- The Illinois Landlord and Tenant Act does not address additional occupants or co-tenant liability.
- Everyone named on the lease is normally jointly and severally liable, so a landlord can collect all the rent from one roommate.
- In Chicago the RLTO's sublease provision limits a landlord's ability to reject a reasonable replacement tenant.
Verify the current text in your state's landlord-tenant statutes.
What our Illinois record says about adding a roommate:
- No roommate statute. No Illinois statute in our record gives tenants a right to add a roommate, sets a deadline to tell the landlord, or sets a deadline for the landlord to answer. Lease terms control who may occupy.
- The state act. Our record of the Illinois Landlord and Tenant Act does not address extra occupants or co-tenant liability.
- Shared rent. Everyone named on the lease is normally jointly and severally liable, so a landlord can collect all the rent from one roommate. A roommate who moves out stays on your bill until the landlord signs a release.
That leaves the roommate paragraph you signed, plus any signed addendum, as the document that answers these questions. Laws change, so check the current Illinois statute text before you rely on this.
What's Specific to Chicago
Chicago adds a rule our state record lacks. The RLTO requires your landlord to accept a reasonable subtenant you offer and bars extra fees for it, which makes a sublet the practical move when a roommate leaves.
Small owner-occupied buildings sit outside the ordinance, and that matters on blocks full of two-flats and three-flats. Ordinance text gets amended, so confirm the current RLTO wording with a tenant hotline or legal aid before you rely on it.
No Illinois statute in our record sets either. A written process with a timeline gives you steps you can hold your landlord to.
Inside Chicago the RLTO requires accepting a reasonable subtenant. Challenge a flat ban in writing if your building is covered.
Silence leaves everyone jointly and severally liable for the whole rent. Language limiting your share is worth asking for.
The RLTO bars extra fees for accepting a reasonable subtenant. Ask what any other roommate fee covers before you sign.
Red Flags to Watch Out For
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Blanket ban on any subletting
Inside Chicago that collides with the RLTO's duty to accept a reasonable subtenant. Ask in writing whether your building is covered before you accept it.
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Guest becomes unauthorized occupant
Some leases turn a visitor into an occupant after a set number of nights, making a partner who stays over a lease violation. Pin down the exact night count.
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Fee to replace a roommate
Chicago's RLTO allows no extra fee for accepting a reasonable subtenant. Push back in writing if one is charged.
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Automatic rent bump per person
No Illinois statute in our record limits a rent increase for each person added. Negotiate that number before you sign, never afterward.
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Departing roommate stays fully liable
Watch for language keeping a moved-out co-tenant on the hook for the whole term. Never assume a verbal release worked. Get a signed amendment.
Your Rights as a Chicago Tenant
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Chicago's reasonable-subtenant rule
The RLTO requires your landlord to accept a reasonable subtenant you offer and bars extra fees. It is your strongest tool when a roommate leaves mid-lease.
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Your lease binds them too
Approval steps your lease promises are enforceable against the landlord. If the lease sets a process, they cannot invent a different one later.
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No surprise house rules
Lease terms control who may occupy, so a rule handed over after signing is not automatically part of the deal you made.
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A signed addendum binds both sides
You and your landlord can sign an addendum adding or releasing a co-tenant. Once signed, it binds the landlord as firmly as it binds you.
What To Do - Step by Step
Reread the occupancy clause
Find the exact wording on approval, guests, subletting and fees. No Illinois statute in our record adds a roommate rule on top of it.
Ask in writing
Email the person's full name and planned move-in date. A dated request shows when you asked if the answer is no or never comes.
Check whether the RLTO covers you
Small owner-occupied buildings fall outside it, so ask whether yours is one. Coverage decides whether the reasonable subtenant rule is yours to use.
Offer a qualified replacement
When a roommate leaves, bring a subtenant with income and references. A covered landlord refusing a reasonable candidate stands on weaker ground.
Get liability changed on paper
A departing roommate's release counts only if the landlord signs it. Ask for an amendment naming who owes what from a specific date.
Call for help early
Chicago has tenant hotlines and legal aid. A demand for a full term's rent after a roommate leaves is worth an hour of an attorney's time.
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Frequently Asked Questions
Roommate rules near Illinois
The same clause in the nearest states we cover.
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