Complete a homestead declaration form. Sign your declaration in front of a notary.A homestead declaration is a legal document that claims and registers a particular house as the owner's homestead or. To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. These forms are from the San Diego County Recorder's website. To qualify for the homeowners' exemption, the home must have been the principal residence of the owner as of January 1 of that tax year. The County Assessor administers the homeowner tax exemption program, which allows homeowners to claim a. SAN DIEGO Are you a San Diego County homeowner? In California, you don't necessarily have to file a homestead declaration. Buy a declared homestead form from an office-supply store, or download a form from the Registrar-Recorder's website.