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Free Illinois Lease
Extension Addendum Template

The agreement is signed by the same parties as the lease it attaches to.

Last reviewed August 2026

Written by LawLease Editorial

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Illinois Lease Extension Addendum

This Lease Extension Addendum is built with Illinois as the governing state. These are the Illinois landlord-tenant rules that most often bear on it, with the statute for each.

Illinois rules at a glance

Illinois rules for a Lease Extension Addendum
Month-to-month termination30 days’ written notice by either party735 ILCS 5/9-207
Rent controlProhibited statewide50 ILCS 825/1
Rent increasesThere is no Illinois statute setting a rent-increase notice period. For a month-to-month tenancy an increase is a unilateral change of terms, so the 30-day termination notice under 735 ILCS 5/9-207 is used by analogy.
Rent control is preemptedThe Rent Control Preemption Act bars every Illinois local government from enacting or enforcing rent control (50 ILCS 825/1). The Chicago, Cook County and Evanston ordinances regulate fees and process — not the amount of rent.

Rent, late fees & increases

Outside Chicago, Cook County and Evanston, Illinois has no law capping residential late fees and no mandated grace period. A late fee is enforceable because it is written into the lease and reasonable — not because it falls under a statutory ceiling. The widely repeated “5% is the legal maximum” figure is industry practice, not Illinois law.

  • Rent increases — There is no Illinois statute setting a rent-increase notice period. For a month-to-month tenancy an increase is a unilateral change of terms, so the 30-day termination notice under 735 ILCS 5/9-207 is used by analogy.
  • Rent control is preempted — The Rent Control Preemption Act bars every Illinois local government from enacting or enforcing rent control (50 ILCS 825/1). The Chicago, Cook County and Evanston ordinances regulate fees and process — not the amount of rent.
  • Coming July 2026 — HB 3564 requires every non-optional fee to appear on the first page of the lease or the tenant is not liable for it, caps application fees at $50, and bans eleven categories of “junk fees.”

Illinois Lease Extension Addendum FAQs

How much notice ends a month-to-month lease in Illinois?

30 days’ written notice from either party (735 ILCS 5/9-207). Week-to-week takes 7 days, and a year-to-year tenancy takes 60 days given within the four months before the final 60 days of the year (735 ILCS 5/9-205).

Does Illinois have rent control?

No. The Rent Control Preemption Act bars every Illinois city and county from enacting or enforcing rent control (50 ILCS 825/1). The Chicago, Cook County and Evanston ordinances regulate fees, deposits and process — not the rent itself.

More Illinois landlord documents

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