This exemption lasts up to four years. Application Due Date: No application is required.Join us for a workshop to learn about the Cook County Assessor's Office and homeowner exemptions. This Video Shows you How to Complete an Application for Homestead Exemption. First-time applicants must have been the occupants of the property as of January 1 of the tax year in question. You must complete a homestead application. If the type of homestead requires additional forms, please have the additional forms at the time of application. Fill in the appropriate oval to the right of. "Yourself. The Cook County Assessor's Office automatically renews Homeowner Exemptions for properties that were not sold to new owners in the last year. Return the certification statement no later than 30 days from the date of the letter to the address provided in the letter.