If you qualify all you have to do is file an application with your local county office. The Cook County Assessor's Office has adjusted their 2022 Exemption Application mailing timeline as follows.Property owners who occupy their homes as their principal place of residence on January 1 may be eligible for an exemption. The BOR accepts exemption applications for approximately 30 days, four times each year. STATEMENTS. This claim may be used to file for the Homeowners' Exemption for the Assessment Roll and the Supplemental Assessment Roll. However, some transfers are exempt from completing a Certificate of Compliance. Non-Exempt Property Transfers (Requires a Certificate of Compliance). You can apply for an exemption through the Cook County Assessor's Office, which will review your application. Certain types of property transfers are exempt from Certificate of Compliance requirements (such as a zoning inspection and final water meter reading) Homeowners Exemption.