How is a Illinois notice to quit delivered to the tenant?
Illinois typically permits three service methods: personal delivery (handing the notice directly to the tenant), substituted service (handing it to a competent adult at the residence and mailing a copy), and posting plus mailing (posting the notice on the door and sending a copy by first-class mail). Certified mail alone is usually NOT sufficient on its own; the statute requires a physical delivery component. Service must be documented: a written declaration of service stating the date, time, place, and method, signed by the server. Improper service is the single most common reason eviction cases are dismissed in Illinois. The notice period (5 days for pay-or-quit under 735 ILCS 5/9-209, 10 days for violations under 5/9-210) starts running on the day after service.
Source: Illinois eviction service rules
This is an informational answer based on Illinois eviction service rules as of early 2026. It is not legal advice. Housing law changes year to year and local ordinances (especially in rent-controlled or rent-stabilized cities) can override or add to state law. For contested cases, consult a Illinois-licensed attorney.