Can a Illinois landlord enter the unit without notice?
Generally no for non-emergency entries. Illinois (and most US states) require the landlord to give reasonable advance notice (typically 24-48 hours) before entering for non-emergency reasons like inspections, repairs, or showings. Emergency entries (fire, flood, gas leak, suspected danger) are an exception. Routine entries should be at reasonable times during normal business hours. A landlord who enters without notice or at unreasonable times can be liable for trespass, breach of quiet enjoyment, and tenant damages. The lease cannot waive the notice requirement in most states.
Source: Illinois entry notice statute
This is an informational answer based on Illinois entry notice statute 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.