Keeping radon mitigation documentation with the property records
Understand the importance of maintaining radon mitigation history to support future property transfers and ensure compliance with Illinois disclosure laws.
The short answer
Maintaining thorough records of radon mitigation is essential for future sales under the Illinois Residential Real Property Disclosure Act. While sellers only disclose known material defects, retaining proof of completed, licensed mitigation helps clarify property history. Keep all professional installation records and maintenance reports in a safe location to provide accurate disclosures during your future home sale.
Understanding Disclosure Obligations
The Illinois Residential Real Property Disclosure Act requires you to disclose material defects of which you have actual knowledge. If you have performed mitigation, the system is an improvement to the property. Maintaining documentation proves you addressed a known condition, protecting you from future claims of misrepresentation regarding your property history.
Worksheet: Create a 'Property History Binder' containing all invoices, permits, and professional reports related to home improvements, specifically radon systems.
Storing Mitigation Records
Radon mitigation systems often require periodic maintenance. Keeping records of the original installation date and subsequent service checks allows future buyers to see that the system was professionally managed. If a system was installed by a licensed professional, those documents are the best evidence of a valid installation.
Worksheet: Keep copies of the contractor's license, the installation date, and a copy of the final test report confirming the reduction in radon levels.
Mitigation vs. Maintenance
Distinguishing between an active mitigation system and routine maintenance is critical. If your system requires an annual check, document those inspections. Future buyers may ask for proof that the system is operating within expected parameters. Clear records prevent confusion about whether the system is a 'defect' or a functioning, managed upgrade.
Worksheet: Document dates of system inspections and any replacement parts, such as fans or monitoring devices, as part of your permanent property record.
Preparing for Future Disclosures
When you eventually sell, you must complete the disclosure form accurately. Having your records prepared allows you to confidently answer questions about the property's condition. If you ever have doubts about the significance of a past repair, ask a legal professional to review your records before you fill out the disclosure document.
Worksheet: Prepare a summary sheet of all property upgrades for your agent, attaching the supporting documents for any radon-related work.
Checklist
- Gather all invoices for original radon system installation
- Retain all annual inspection or service maintenance reports
- Keep the contractor's licensing documentation for the work performed
- Maintain a log of all post-mitigation testing results
- Store these documents in a fireproof location or cloud-based record system
Common questions
Is it mandatory to disclose a radon mitigation system?
Yes. If the system addresses a material defect or is a known property feature, it should be reflected in your disclosures to ensure transparency regarding the home's condition.
What if I cannot find my mitigation paperwork?
If records are missing, contact the company that performed the work to request duplicate reports. If they are no longer in business, inform your attorney so they can advise on how to accurately describe the system on your disclosure form.
Sources
- Illinois Residential Real Property Disclosure ActChecked October 12, 2026
- Illinois Condominium Property Act — 2025 editionChecked October 12, 2026
- IEMA-OHS — Real estate radon guidanceChecked October 12, 2026
- EPA — Real estate lead-hazard disclosuresChecked October 12, 2026
This guide is general educational content from SQFT IO, prepared with AI assistance. It is not legal, tax or loan advice. Talk with a licensed attorney, tax professional or lender about your situation. SQFT IO Illinois license 478.027617.