Bed Bugs in Illinois Rentals: Tenant and Landlord Basics

Report early, and in writing

Tenants should report bed bugs in writing as soon as they notice signs. Early reporting keeps the problem to one unit, creates a record of when it started, and starts the clock on treatment. Waiting lets the infestation spread — and can muddy who is responsible.

Keep copies of the report and any photos. A clear timeline is the most useful thing a tenant can have if responsibility is later disputed.

Treat the building, not just one unit

In a multifamily building, bed bugs travel through shared walls, pipe chases and outlets, so the units above, below and beside the infested one should be inspected and treated as needed. Treating a single unit while neighbors stay infested is the most common reason bed bugs come back.

This is why coordinated, documented treatment across adjoining units matters for property managers — it is the only approach that actually ends the problem in a building.

Who pays?

Cost responsibility depends on the lease and any local ordinance. Landlords commonly arrange treatment to meet habitability obligations, while some leases assign responsibilities to tenants in certain circumstances. This is general guidance, not legal advice — the controlling answer is in your specific lease and your municipality’s rules.

What both sides can do to limit cost

Tenants: report early, do not move belongings to other units, and follow the prep instructions for treatment. Landlords: inspect adjoining units, use a coordinated treatment plan, and keep per-unit records. With area renter shares from 27% in Joliet up to 43% in Morris, these situations are common enough that having a standard process pays off.