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What friends can—and cannot—learn from a Zestimate
A Zestimate is Zillow’s estimate of a home’s market value. Zillow says plainly, “It is not an appraisal and can’t be used in place of an appraisal.” (Zillow’s Zestimate explanation.) It is a public-facing estimate, not a disclosure of an owner’s financial position.
- It can suggest: Zillow’s current estimate of the home’s market value, along with an estimated sales range that communicates uncertainty.
- It cannot establish: what the owner paid, what a buyer would actually pay today, how much is owed on the mortgage, or the owner’s equity or net worth.
That distinction matters because an estimated property value is only one piece of a household’s finances. Two owners with similarly valued homes may have very different mortgages, other debts and assets.
How Zillow arrives at its estimate
Zillow describes the Zestimate as a neural-network-based model drawing on property information and market signals. Its inputs include county and tax assessor records, feeds from multiple listing services, and facts such as location, square footage, bedrooms and bathrooms. For a listed home, it may also use the listing price and description, comparable homes and time on market. For an off-market home, inputs include tax assessments, past sales and other public records. Market trends, including seasonal demand, also factor in. Zillow presents an estimated sales range alongside the single figure to show that the result can vary.
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The estimate is only as useful as the information and market data available for that property. Zillow says most estimates update multiple times per week, though updates can occasionally be delayed. Its April 2026 explanation of the model sums up a central limitation: “Value is highly local.”
Why a Zestimate may seem wrong
Automated models can miss details that distinguish one home from another, especially when records are incomplete or the home has unusual features. A major addition, renovation or other improvement may not appear in public records or listing data. Homes in places with few recent sales can also be harder to estimate because there are fewer useful comparisons.
Zillow’s April 2, 2026 article reports typical off-market error of about 7% MdAPE. MdAPE, or median absolute percentage error, summarizes the middle error across a group of estimates compared with sale prices; it does not mean every home’s Zestimate is within 7% of its eventual sale price. The figure is Zillow’s reported aggregate measure, not a confidence interval or accuracy promise for any individual home. Zillow’s older January 2015 agent explainer reported a 7.9% national median error rate, but that historical figure should not be treated as a current performance measure.
How to check or correct your home’s details
If you own the home and the number looks off, start by reviewing the facts Zillow has for it. Zillow recommends checking home facts, tax history and sale history. Incorrect public records, missing improvements or outdated details can affect the estimate.
- Claim the home on Zillow. Zillow’s owner guidance explains how to claim a property and review its facts: Zillow’s Zestimate FAQ.
- Review the listed characteristics and history. Check items such as square footage, bedrooms and bathrooms, plus tax and sale history, against what you know about the property.
- Submit corrections to the home facts. Zillow says submitted changes are incorporated, but correcting a fact does not guarantee the Zestimate will change. A cosmetic update or a change the model does not expect to affect value may leave the estimate unchanged.
- For missing additions or renovations, check public records. Zillow advises homeowners to report updates to their local tax assessor when relevant; updating a public record may help ensure property information is reflected in the data Zillow uses.
How a Zestimate differs from other valuation references
A single online number can be convenient, but different valuation methods serve different purposes and use different information. Zillow’s materials distinguish its automated estimate from both an appraisal and a local agent’s comparative market analysis.
| Reference | What it is | What to keep in mind |
|---|---|---|
| Zestimate | Zillow’s automated estimate, based on property records, MLS information, submitted facts and market signals. | Broad and convenient, but not an appraisal; it may not reflect unrecorded improvements or a home’s specific condition. |
| Appraisal | A formal valuation by an appraiser, distinct from Zillow’s estimate. | Zillow’s cited materials establish that it is not interchangeable with a Zestimate; they do not specify appraisal requirements, costs or jurisdiction-specific practices. |
| Local agent comparative market analysis | A local agent’s valuation reference identified in Zillow’s historical explainer. | It offers another perspective, but the materials cited here do not establish a universal method or cost. |
For a major financial decision, such as setting a sale strategy or assessing a property for a transaction, treat the Zestimate as a starting point rather than the final word. A valuation that accounts for the individual home and local conditions is more useful than relying on a broad automated estimate alone.
Does Zillow let owners hide or remove an off-market Zestimate?
Zillow’s Listing Access Standards discuss keeping a listing private and describe seller-signed waivers or opt-out forms for homes that are not publicly marketed. That policy concerns listing marketing and distribution; it does not establish a general process for removing an existing off-market home page or Zestimate. Owners should not assume that opting out of public marketing removes an estimate already shown on Zillow. (Zillow Listing Access Standards.)
Why home values became so easy to look up
Zillow says the Zestimate launched in February 2006, initially covering 40 million homes with monthly estimates. In a 2023 account of its product history, the company said it covered more than 100 million U.S. homes and updated estimates several times weekly. Zillow also says it introduced its Neural Zestimate upgrade in June 2021. Those milestones explain how home-value estimates became a routine online lookup; they do not make any one estimate a verified sale price.
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