This is an estimate for planning, from Zillow's ZIP-wide typical values applied to your purchase price. It is not an appraisal, a broker price opinion, an offer, a loan offer, or tax or legal advice, and Rudy is a real estate agent, not a lender, appraiser or tax professional.
How the estimate works
- We pull Zillow's typical value in your ZIP code for your home type, once for your purchase month and once for the latest month.
- That change, as a percentage, is applied to your price; the condition you choose sets how wide the range runs.
- An original loan is paid down on a normal fixed-rate schedule in this model, with the first payment the month after you bought.
- Middle value minus loan is your equity estimate; take away selling costs as well and you have a net before taxes.
- The Prop 13 estimate compounds your purchase price by the State Board of Equalization's annual factors, which are capped at 2%.
Your Prop 13 value and Prop 19
Orange County taxes your home on its Prop 13 base, which starts at the purchase price and can rise only up to 2% each year. Owners who bought in San Clemente long ago often have a taxable value well under market.
For owners 55 and older, Proposition 19 can carry that base to a replacement home anywhere in California purchased within two years of the sale, and it can be used up to three times. The assessor makes the determination.
Practical next reads: the downsizing calculator and Orange County property tax for San Clemente owners.
Sources and dates
- Zillow Research, Zillow Home Value Index (ZHVI) by ZIP code: all homes, single-family and condo; middle tier, smoothed and seasonally adjusted (data through September 2026, files updated Oct 16, 2026)
- FHFA House Price Index for five-digit ZIP codes (annual, developmental index, not seasonally adjusted; 2000 = 100), used only for purchases before Zillow's series begin. Citation: Bogin, Doerner and Larson, Local House Price Dynamics: New Indices and Stylized Facts, FHFA Working Paper 16-01 (annual, through 2025)
- Freddie Mac Primary Mortgage Market Survey (PMMS): weekly 30-year and 15-year fixed averages; the page uses the mean for your purchase month (monthly means through October 2026; latest weekly 30-year average 7.24% on Oct 29, 2026)
- California State Board of Equalization, Letter To Assessors No. 2026/002: inflation factors for 1976-77 through 2026-27, with Revenue and Taxation Code section 51 and California Constitution article XIII A, section 2(b) (January 13, 2026)
- California State Board of Equalization, Proposition 19 (checked Oct 30, 2026)
- Assumptions, not sourced figures: the condition range (the same rule of thumb as the home value range tool), 6% selling costs, 20% down, regular payments on a fixed-rate loan starting the month after you bought, and the first inflation factor applying on the first January 1 after your purchase
Questions owners ask
Can I price my home from this number?
Use it as a starting point, not a list price. A ZIP index cannot tell an ocean-view lot from an inland one, or a new kitchen from an original one. Pricing comes from recent comparable sales, which Rudy will pull for you at no cost.
Why a ZIP-code index rather than my exact address?
A monthly ZIP series is the most consistent public measure that reaches back to your purchase. Address-level value depends on recent sales and condition, which a review of comparables covers.
How do I enter a refinance or an equity line?
Select "Refinanced, or I know my balance" and type the combined amount you owe today. The page uses it directly.
Is the Prop 13 taxable value my market value?
No. It is the base Orange County taxes you on: your price plus up to 2% a year. Market value is separate, and your tax bill has the exact taxable figure.
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