Individual with a permanent physical disability who has lost all mobility that precludes locomotion without the use of a mechanical aid or prosthesis. You must file the application (Form 458) with the county assessor's office where the original home resides between February 2 to June 30.7. Individuals who have a developmental disability (Form 458B is required). Homestead exemption applications must be filed annually between February 2 and June 30. Application forms are typically available beginning February 2. Most homeowners are eligible for this exemption if they own and occupy their property as their principal place of residence. As of June 7, 2017, we have not received your Homestead Exemption. Application for 2017.