Property Tax Appeals in Lake County, California
Lake County's Assessment Appeal page states that, effective May 5, 2016, a non-refundable application processing fee of $35 per application applies to residential property up to three units and $100 per application applies to all other property types, payable by check or money order to the County of Lake, and that applications submitted without the fee will not be processed. Regular Assessment filing dates are July 2 through November 30th, and appeals not settled with the Assessor-Recorder's Office are scheduled before the Board of Supervisors sitting as the Lake County Local Board of Equalization. The Assessment Appeal Application directs applicants to return the completed form to the Clerk of the Board, 255 N. Forbes Street, Lakeport, CA 95453. FairPath can help an owner organize a comparison table, condition photos, official links, and a filing checklist. It does not file the application, choose the owner's opinion of value, pay the fee, or communicate with the Assessor-Recorder's Office on the owner's behalf.
Assessment context: Begin with the Assessor-Recorder's parcel record and confirm whether the dispute concerns the January 1, 2026 lien-date value on the regular roll or a supplemental assessment, which Lake County's page places on a separate 60-day filing clock from the notice or tax bill date. Lake County surrounds Clear Lake, the largest natural freshwater lake entirely within California, with the county seat of Lakeport and the city of Clearlake on its shores, vineyard and agricultural land in valleys such as Big Valley and Scotts Valley, geothermal energy production in The Geysers area, and forested, wildfire-prone terrain across much of the county's hillside and rural parcels. A property a few miles away may sit in a different flood, geothermal, or wildfire-hazard zone, so site conditions should be confirmed against the Assessor-Recorder's record rather than assumed from a map.
Filing process: Lake County's Assessment Appeal page states that the non-refundable processing fee is $35 per application for residential property up to three units and $100 per application for all other property types, payable by check or money order to the County of Lake and required at the time of filing; applications submitted without the fee will not be processed. Regular Assessment filing dates are July 2 through November 30th, and appeals submitted outside the open filing dates will be returned. The Assessment Appeal Application directs applicants to mail the completed form to the Clerk of the Board, County of Lake, 255 N. Forbes Street, Lakeport, CA 95453, and the page states that the applicant or a duly appointed agent must personally appear at the hearing or the application will be denied unless a stipulation has already been fully executed.
Evidence to review: Lake County's Assessment Appeal page states that for appeals scheduled before the Lake County Local Board of Equalization, the Board is required to find the Full Cash Value of the property from the evidence presented at the hearing, and that this finding may exceed the value on which the assessment was based, in which case the assessment would be raised rather than lowered. Build a comparable-sales table showing sale date, price, parcel, community, lot size, living area, age, and condition, weighted toward sales near the January 1, 2026 lien date. For lakefront, vineyard, geothermal-adjacent, or wildfire-affected parcels, document site conditions, water access, and any damage or hazard designations with dated photographs, since Lake County's geography spans lake, agricultural, geothermal, and fire-prone terrain.
Current deadline guidance: 2026 regular assessment appeals: July 2 through November 30, 2026. Lake County's Assessment Appeal page states, under Open Filing Dates, that Regular Assessment filing dates are July 2 through November 30th, that Supplemental Assessment filing dates run within 60 days after the mailing date printed on the supplemental notice or tax bill or the postmark date, whichever is later, and that appeals submitted outside those dates will be returned, consistent with the California State Board of Equalization's certified 2026 county filing-period table.
Lake County's Assessment Appeal page sets Regular Assessment filing dates of July 2 through November 30th, and states that appeals submitted outside those dates will be returned.
Lake County's non-refundable processing fee is $35 per application for residential property up to three units and $100 per application for all other property types, effective May 5, 2016.
Lake County's Board of Supervisors hears unsettled appeals sitting as the Local Board of Equalization, rather than a separately appointed Assessment Appeals Board.
Lake County's page states that the Board of Equalization's Full Cash Value finding may exceed the assessed value, which would raise rather than lower the assessment.
Official filing authority: Lake County Clerk of the Board of Supervisors. https://www.lakecountyca.gov/1153/Assessment-Appeal-
Source: Lake County, Assessment Appeal, https://www.lakecountyca.gov/1153/Assessment-Appeal-. Reviewed 2026-09-22.
Source: Lake County Clerk of the Board, Assessment Appeal Application (BOE-305-AH), https://www.lakecountyca.gov/DocumentCenter/View/4352. Reviewed 2026-09-22.
Source: California State Board of Equalization, Letter to Assessors 2026/023: 2026 Assessment Appeal Filing Periods, https://boe.ca.gov/proptaxes/pdf/lta26023.pdf. Reviewed 2026-09-22.
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