Exemption applications must be filed with your local assessor's office. See our Municipal Profiles for your local assessor's mailing address.This exemption can be applied to all residential property up to five dwelling units of which at least one is owner occupied. This exemption lasts up to four years. Application Due Date: No application is required. Douglas County has additional exemptions. The General Homestead Exemption is granted automatically in most cases. Determine your home's current market value. This can provide asset protection from creditors for at least some of house's value. Applicants will need to provide proof of residency (ex.