Zestimate vs. Appraisal: What’s the Difference?

An appraisal is an opinion prepared for an agreed assignment. Before paying for one, identify the decision you need to make and the evidence the recipient will accept.

Look at the recorded property characteristics and the date of the estimate. Zillow notes that accuracy depends on available data. Missing or incorrect information can affect the result. Its published error figures describe groups of homes, not a guaranteed error range for yours.

A court, reviewing authority, lender or insurer may have its own evidence and ordering rules. There is no universal rule that every automated estimate is rejected or every signed appraisal is accepted. For example, Fannie Mae’s PMI guidance includes automated valuation and BPO processes in specified circumstances.

If an estimate and an appraisal differ, review their dates, property details, evidence and assumptions. Ask the appraiser about material factual errors or missing information. An appraiser’s signature does not mean every conclusion is beyond review.

• Check the effective date and intended use.
• Compare property size, condition and improvements.
• Review the sales and adjustments in the appraisal.
• Confirm the recipient’s requirements before submitting either document.

Sources checked September 10, 2026. Confirm the requirements for your specific assignment with your recipient or advisor.

• Zillow: What is a Zestimate?
• Fannie Mae: Conventional mortgage insurance termination

• What a home appraisal really costs
• Assessed value vs. market value, explained
• How the guided phone walkthrough works