Zestimate
A Zestimate is an automated home value estimate from Zillow. Learn how Zestimates are calculated and their accuracy limitations.
Definition
A Zestimate is an automated property valuation estimate produced by Zillow’s proprietary algorithm. It uses publicly available data (such as tax assessments, recent sales, and home facts) along with machine learning models to estimate a home’s market value. While Zestimates provide a quick reference, they can be inaccurate due to data quality, unique property features, or rapidly changing markets. Homeowners and buyers should use Zestimates as a starting point and consult real estate professionals or appraisers for more accurate valuations.
Why It Matters
It is a model fed by public records, and it does not know your kitchen was gutted in 2019 or that the back fence sits on a freeway. Published error rates run several percent on off market homes, which on an $800,000 house is tens of thousands of dollars in either direction. The real damage is psychological: buyers quote a low Zestimate to talk you down, and sellers anchored to a high one turn away fair offers.
Examples
A fully remodeled 1968 split level shows a $712,000 Zestimate because the assessor still records the original 1.5 baths, and it appraises at $790,000.
A buyer's agent opens negotiation by citing a $645,000 Zestimate on a home listed at $699,000 with three comparable sales closing above $690,000.
A seller corrects the home facts and uploads photos through the Zillow owner dashboard, and the Zestimate moves about $23,000 within a few weeks.
Tips
Claim the property on Zillow and fix the bed count, bath count, square footage and lot size, since the model reads those fields and assessor data is often years out of date.
When someone quotes a Zestimate at you, answer with three closed sales including addresses and dates; a specific comp beats an algorithm in every negotiation.
If you are pricing your own listing rather than hiring a full service agent, spend $500 to $700 on an appraisal or broker price opinion first, because a flat-fee MLS listing only saves money if the number is right on the opening weekend.
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