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
- Zillow's typical value for your ZIP code and home type is taken for the month you purchased and for the newest month available.
- Your purchase price changes by the same percentage, and the condition setting draws the range around it.
- With the loan you bought with, the remaining balance comes from the standard fixed-rate payment schedule, beginning one month after closing.
- Equity equals the midpoint less the loan; the net subtracts your selling-cost percentage too, and comes before taxes.
- Your Prop 13 figure is the price you paid, increased by each year's Board of Equalization inflation factor, capped at 2%.
Your Prop 13 value and Prop 19
In California your taxable value is tied to your purchase, not to today's market. Prop 13 lets it grow 2% a year at most, so a Carlsbad owner who bought years ago may be taxed on far less than the home would bring.
Downsizing at 55 or older? Under Proposition 19 your taxable value can move to a replacement primary home anywhere in California if you purchase it no more than two years after selling, and you can do this three times. Your county assessor confirms eligibility.
Moving to something smaller? Try the downsizing calculator and how Prop 19 works when you move within California.
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
How accurate is a ZIP-based estimate for a Carlsbad home?
It gives a good sense of direction and a rough sense of size. It cannot account for an ocean view, a larger lot or a full remodel, which can move value well beyond the range. Rudy's free comparable-sales value fills that gap.
Why can't I estimate a house in 92008?
Zillow publishes no single-family series for 92008, and its all-homes series jumps in 2025 in a way the condo series and the wider metro do not, so the page leaves it out. Condos in 92008 still work. For a house, ask Rudy for a value from recent sales.
Why does it start from my ZIP code and not my street?
Zillow's ZIP figures are published monthly from 2000 on, so the change since your closing sits on one consistent scale. Your street, lot and finishes enter through comparable sales, which Rudy reviews for you.
I have a second loan or refinanced. Which option do I pick?
Use the second loan choice and enter your total payoff today, including any home equity line. That replaces the payment estimate with your real balance.
Does my Prop 13 value tell me what the home is worth?
No. It is a tax figure that starts at your purchase price and rises no more than 2% a year. Your tax bill shows it exactly, and market value is usually higher.
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