Zillow Group · Real Estate
Zillow Zestimate
Zillow's AI-powered automated valuation model that estimates property values for over 100 million homes across the United States.
Overview
The Zestimate is Zillow's proprietary automated valuation model (AVM) that uses machine learning to estimate the market value of residential properties. It processes data from public records, MLS listings, user-submitted information, and satellite imagery to generate valuations for over 100 million U.S. homes. With a national median error rate of approximately 2.4% for on-market homes, the Zestimate has become the most widely recognized property valuation tool in the United States, shaping how consumers and professionals think about home values.
Coverage
100M+ U.S. homes
Accuracy
~2.4% median error (on-market homes)
Data Sources
MLS, public records, satellite imagery, user data
Update Frequency
Multiple times per week
Model Type
Neural network ensemble AVM
Capabilities
Automated property valuation for 100M+ homes
Real-time value updates as new data becomes available
Comparable property analysis and identification
Market trend detection and forecasting
Property feature impact analysis on value
Use Cases
Providing homeowners with instant property value estimates
Supporting home buyers with pricing context during property search
Enabling real estate agents to set competitive listing prices
Powering mortgage and lending pre-qualification estimates
Pros
- +Most widely recognized and used property valuation tool in the U.S.
- +Covers virtually every residential property in the country
- +Continuously improving accuracy through vast data feedback loops
- +Free consumer access democratizes property value information
Cons
- -Accuracy varies significantly by region and property type
- -Off-market home estimates have higher error rates (~7.5%)
- -Cannot account for interior condition or recent renovations
- -May create unrealistic seller expectations based on estimated values
Pricing
Free for consumers on Zillow.com and Zillow app. Zillow API access available for partners. Enterprise data licensing through Zillow Group.