1.) Carbon Monoxide Compliance: Sellers must ensure the home has functional carbon monoxide alarms within 15 feet of all sleeping areas (430 ILCS 135/10).

2.) Lead-Based Paint Disclosure: If the property was constructed before 1978, the seller must disclose any history of lead-based paint and provide an EPA-approved pamphlet (42 U.S. Code § 4852d). 

3.) Radon Disclosure: Sellers must submit this form, which outlines the property’s radon test history, as well as the state’s Radon Testing Guidelines for Real Estate Transactions pahmplet (420 ILCS 46/10).

4.) Residential Real Property Disclosure Report: Sellers must disclose the property’s known material defects (765 ILCS 77/20). This form was updated in 2022 to include a question about whether the seller has ever occupied the property.