To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. Complete a homestead declaration form.0117). How to Apply for the Homeowners'. Exemption. Complete form BOE-266, Claim for Homeowners'. I own the following interest in the above-declared homestead: 4. The above-declared homestead is my principal dwelling. How do I fill this out? Before you use this form, fill in all blanks, and make whatever changes are appropriate and necessary to your particular transaction. Consult a lawyer if. How do I file a declared homestead?