To do this, I used Zillow's own data and simply multiplied the median
Zestimate error percentage by the median sale price of homes to create the «typical»
Zestimate error in dollars.
You can find
the Zestimate error rate for all the metro areas HERE.
In some cities — including Houston, Kansas City, San Antonio and St. Louis — Zillow is unable to produce
a Zestimate error rate because of state real estate disclosure laws.
The typical Zillow
Zestimate error is $ 14,000, but you don't know if it's $ 14,000 too high or $ 14,000 too low.
-LSB-...] To see a detailed discussion of Zillow
Zestimate errors, including two graphs that clearly show you how inaccurate Zestimates are, see my previous post.
Not exact matches
In 2016, the median
error rate for Zillow's
Zestimate ™ dropped from 8 percent to 4.5 percent.
«Overall, the
Zestimate is incredibly accurate — with a median
error rate of 4.5 percent — but occasionally human
error does occur,» Zillow spokesman Viet Shelton said in a statement.
Zillow officials say the
Zestimate's
error rate is 5 percent on the more than 110 million U.S. homes it provides valuations upon.
The
Zestimate's current margin of
error is 4.5 percent nationwide.
For comparison, the median
error for Zillow's
Zestimate of home values is greater than 8 %.
So I converted the published
Zestimate percentage
errors into dollar
errors for 25 U.S. metro areas and the U.S. as a whole.
I took Zillow's
error rates for a sample city, Denver, from the table above and created the graph below so you can visualize the accuracy of Zillow
Zestimates.
You can see from the table above that the accuracy varies from city to city but overall the median
error rate for all Zillow
Zestimates in the U.S. is 6.1 %, according to Zillow.
ADDED: To make this easier for you, I took Zillow's own data and created a Zillow
Zestimate Accuracy Chart which includes the Typical Zillow
Error in Dollars for 25 U.S. cities.
Zillow publishes the median percentage
error of their
Zestimates but I think it's a lot easier to think in dollars rather than in percentages.
Zestimates have a median
error rate of 4.3 % nationally.
On a $ 500K home that is potentially $ 100,000
error or «
Zestimate» inaccuracy.
So, if the median
error was 7.6 % and the median price was $ 255,000 then the typical dollar
error for
Zestimates in that county would be $ 19,380 (0.076 x $ 255,000 = $ 19,380).
The other 90 % of
zestimates had an even greater margin of
error than that!
I think sellers need to be made more aware that the small percentage of «margin of
error» that Z has as a disclaimer, has a potential price difference of tens of thousands of dollars, sometimes hundreds of thousands of dollars of actual sale price compared to the delusional «
Zestimate ®» price.