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Santa Clara County · Mountain ViewMountain View property taxes. Prices stalled. Assessments kept climbing.
The typical home in Mountain View, in Santa Clara County, was worth about $1,985,000 in January 2026, 0.3% less than a year earlier. Assessed values can still rise up to 2% a year, so a flat market can quietly push an assessment above what a home would sell for.
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What Mountain View home values did
Mountain View values were essentially flat into January 2026, sitting 1.1% under the May 2022 high. Across Santa Clara County, the typical value was 1.6% below its own peak at the same point, so Mountain View saw about the same drop as the county as a whole.
Values kept falling after January: by August 2026 the typical home was 2.7% lower again. If that holds through January 1, 2027, next year's case could be stronger than this year's.
| Measure | Value |
|---|---|
| January 2026 (2026 lien date month) | $1,985,000 |
| Peak since 2021 | $2,008,000 in May 2022 |
| January 2026 vs. peak | -1.1% |
| January 2026 vs. January 2025 | -0.3% |
| Latest (August 2026) | $1,932,000 |
Which Mountain View owners may be over-assessed
Under Prop 13, your assessment starts at your purchase price and can rise up to 2% a year. Under Prop 8, it must drop to market value whenever market value as of January 1 is lower. The table compares a typical purchase in each year with the January 2026 typical value of $1,985,000.
| Bought in | Typical price that year | Rough 2026 assessment | vs. January 2026 value |
|---|---|---|---|
| 2021 | $1,732,000 | $1,912,000 | Below market |
| 2022 | $1,927,000 | $2,085,000 | Possibly over-assessed by about $100,000 |
| 2023 | $1,805,000 | $1,915,000 | Below market |
| 2024 | $1,930,000 | $2,008,000 | Close to market |
| 2025 | $1,938,000 | $1,977,000 | Below market |
The buyers most likely to be over-assessed are those who bought in 2022. A typical 2022 purchase would carry a 2026 assessment of roughly $2,085,000 after the 2% annual increases, about $100,000 more than the January 2026 typical value. At California's 1% base tax rate, that's on the order of $1,000 a year before local voter-approved add-ons.
This is an illustration built on citywide typical values, not an estimate of your home. Your assessment notice shows your actual assessed value, and some assessors lower values on their own in a falling market, so check it first. If you do appeal, your evidence has to show your home's market value.
Santa Clara County deadlines
- 2026 regular filing period: closed September 15, 2026. Santa Clara County uses the earlier California window.
- Next regular filing period: July 2 through September 15, 2027, for the 2027 roll.
- Before then: ask the Santa Clara County Assessor how and when it accepts informal decline-in-value review requests for 2027. An informal review never extends the formal deadline.
- Supplemental or escape assessments: these have their own deadline, generally 60 days from the notice date. Check the notice.
Where Mountain View owners file
Mountain View assessments are set by the Santa Clara County Assessor. Formal appeals go to the county's assessment appeals board, not to the city.
| Form | BOE-305-AH, the state Assessment Appeal Application |
|---|---|
| Filing deadline | September 15 (regular window) |
| Where to file | Santa Clara County Clerk of the Board (assessment appeals) |
| Online filing | The county accepts electronic filing. Use its official portal. |
| Appeals office | cob.santaclaracounty.gov |
| Assessor | sccassessor.org · 408-299-5500 |
Confirm the current form, fee and address with the county before you file. The Santa Clara County guide lists step-by-step instructions and official links.
Building a Mountain View case
A citywide index shows the trend. Your appeal needs your house. Look for sales of similar homes in Mountain View that closed near January 1, 2026. The BOE treats comparable sales as the strongest evidence for a home, and the appeals board can't consider sales more than 90 days after the valuation date. Match living area, age, condition, lot and location as closely as you can, and write down every difference you can't adjust for.
Mountain View sits in the San Jose-Sunnyvale-Santa Clara metro, but neighborhood differences matter more than metro trends. A sale across town can be a weaker comparison than one a few streets away.
A Vulorean report pulls comparable sales and a January 1 value opinion into one document you can file with. Eligible self-file reports are free during launch, with no payment card required. Review every comparison before you use it; you know your home's condition better than any dataset.
Check your Mountain View property for free
Start with your address. Eligible self-file reports are free during launch; an account and available report allowance are required. County filing fees are separate.
Start my free property check →Home values: Zillow Home Value Index (ZHVI), all homes, mid-tier, smoothed and seasonally adjusted, through August 2026, from Zillow Research. Purchase-year rows use each year's average typical value and assume the maximum 2% annual increase. Deadlines: California BOE county filing periods. Vulorean is an independent service, not a government office.