Interactive Illinois disclosure map
A seller-report exemption does not erase a licensee's separate duty, and a clean seller report does not replace lead, radon, or an inspection.
Last updated: August 1, 2026
Direct answer: An Illinois residential sale can trigger several independent disclosure tracks. The Residential Real Property Disclosure Act generally covers transfers of property improved with one to four residential units, condominium units, cooperative units, and certain manufactured homes, subject to seller and transfer exemptions. The report is delivered before contract signing and may require a written supplement before closing. A seller client's licensee separately must timely disclose actually known latent material adverse physical facts that a reasonably diligent buyer inspection would not discover. Residential sales can also trigger the Illinois radon pamphlet and disclosure, while most housing built before 1978 triggers federal lead disclosures, records, pamphlet, contract language, and a buyer inspection opportunity. The interactive tree keeps those tracks separate.
Illinois seller report
Generally 1 to 4 units, condos, and co-ops
Report timing
Before the sales contract is signed
Radon timing
Before buyer is obligated
Federal lead screen
Most housing built before 1978
This property form and ordinary seller path fall inside the Act's general scope.
Next: Seller completes every item, delivers the report before contract signing, and supplements known errors, inaccuracies, or omissions in writing before closing.
Actual knowledge of the full Section 15-25 fact pattern is not established. That does not permit false information or dishonesty.
Next: Keep the actual-knowledge and honesty duties separate from speculation, rumor, and a duty to inspect.
Most pre-1978 housing is covered, but the federal rule has specific exemptions such as some zero-bedroom, short-term, elderly, disability, certified lead-free, and foreclosure situations.
Next: For covered housing, provide known information and records, the approved pamphlet, contract disclosures, and the buyer's evaluation opportunity before the buyer is bound.
A covered residential sale requires the IEMA pamphlet and Illinois radon disclosure before the buyer is obligated, subject to the Act's exclusions.
Next: Provide the current materials and known records. The Act does not require testing or mitigation merely because disclosure applies.
Educational screening only. Statutory exceptions and live facts require the current forms, sponsoring-broker process, and transaction-specific legal advice.
The Illinois report covers material defects known to the seller through actual notice or actual knowledge, without requiring the seller to investigate. It is not a warranty, inspection, or guarantee that no undisclosed condition exists. The buyer can still negotiate inspections and an as-is contract.
Section 15 lists transfer-specific exemptions, including certain court-ordered, foreclosure, fiduciary, co-owner, family, governmental, and never-occupied new-construction transfers. An exemption means the seller is outside this particular Act for that transfer. It does not rewrite federal law, radon law, license law, common-law fraud rules, or the contract.
Under Section 15-25 of the License Act, all customers must be treated honestly and must not negligently or knowingly receive false information. A licensee engaged by a seller client must timely disclose to prospective buyers latent material adverse facts about the property's physical condition that the licensee actually knows and that a reasonably diligent inspection would not reveal.
The tested duty is not a command to diagnose, inspect, or repeat unsupported rumors. Mark each element: seller-client licensee, actual knowledge, physical condition, material and adverse, latent, and not discoverable through reasonably diligent inspection.
For most pre-1978 housing, federal law requires disclosure of known lead-based paint and hazards, available records and reports, the approved pamphlet, the lead warning and acknowledgments in the contract, and an opportunity for a buyer's lead evaluation. The rule has specific exemptions, so year built is a screen rather than the full legal conclusion.
For a covered Illinois residential sale, the seller provides the state-approved radon disclosure and IEMA pamphlet before the buyer is obligated under the contract. The law does not make the seller test or mitigate merely because the disclosure track applies.
Not under the Act's residential-real-property definition, which generally covers one to four residential units plus condominium, cooperative, and qualifying manufactured-home interests.
The seller delivers the completed report to the prospective buyer before the contract is signed and supplements it in writing before closing if the seller later becomes aware of an error, inaccuracy, or omission.
No. The seller-report statute, the licensee's Section 15-25 duties, other statutes, and common-law obligations are separate analyses.
No. The Illinois Radon Awareness Act says the disclosure requirement does not imply a duty to conduct radon testing or mitigation.
Most housing built before 1978 enters the federal lead disclosure screen, subject to the rule's specific exemptions.
Checked through August 1, 2026. The downloadable resource also displays its source and review date. The current official source controls if a rule, outline, or procedure changes.