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Originally published Saturday, February 7, 2015 at 8:02 PM

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Zestimates are popular, but handle with care

The property-value estimates posted by Seattle-based Zillow are often treated as gospel by buyers, sellers and real-estate agents, but they should only be used as a starting point since they carry a median error rate of 8 about percent.


Syndicated columnist

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@the ravennaboy zillow is just a mass data base....treat accordingly MORE

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Nation’s Housing

WASHINGTON — When “CBS This Morning” co-host Norah O’Donnell recently asked the CEO of Zillow about the accuracy of the website’s automated property-value estimates — known as Zestimates — she touched on one of the most sensitive perception gaps in American real estate.

Seattle-based Zillow is the most popular online real-estate information site, with 73 million unique visitors in December.

Along with active listings of properties for sale, it also provides information on houses that are not on the market.

You can enter the address or general location in a database of millions of homes and likely pull up key information — square footage, lot size, number of bedrooms and baths, photos, taxes — plus a Zestimate.

Shoppers, sellers and buyers routinely quote Zestimates to real-estate agents — and to one another — as gauges of market value.

If a house for sale has a Zestimate of $350,000, a buyer might challenge the sellers’ list price of $425,000. Or a seller might demand to know from potential listing agents why they say a property should sell for just $595,000 when Zillow has it at $685,000.

Disparities like these are daily occurrences and, in the words of one real-estate agent who posted on the industry blog ActiveRain, they are “the bane of my existence.”

Consumers often take Zestimates “as gospel,” said Tim Freund, an agent with Dilbeck Real Estate in Westlake Village, Calif. If either the buyer or the seller won’t budge off Zillow’s estimated value, he told me in an interview, “that will kill a deal.”

Back to the question posed by O’Donnell: Are Zestimates accurate? And if they’re off the mark, how far off?

Zillow CEO Spencer Rascoff answered that they’re “a good starting point” but that nationwide Zestimates have a “median error rate” of about 8 percent.

Whoa. That sounds high. On a $500,000 house, that would be a $40,000 disparity — a lot of money on the table — and could create problems.

But here’s something Rascoff was not asked about: Localized median error rates on Zestimates sometimes far exceed the national median, which raises the odds that sellers and buyers will have conflicts over pricing.

Though it’s not prominently featured on the website, at the bottom of Zillow’s home page in small type is the word “Zestimates.” This section provides helpful background information along with valuation error rates by state and county — some of which are stunners.

For example, in New York County — Manhattan — the median valuation error rate is 19.9 percent. In Brooklyn, it’s 12.9 percent. In Somerset County, Md., the rate is an astounding 42 percent. In some rural counties in California, error rates range as high as 26 percent. In San Francisco County it’s 11.6 percent.

With a median home value of $1,000,800 in San Francisco, according to Zillow estimates as of December, a median error rate at this level translates into a price disparity of $116,093.

In King County, the median error rate is 7.1 percent.

Some real-estate agents have done their own studies of accuracy levels of Zillow in their local markets.

Last July, Robert Earl, an agent with Choice Homes Team in the Charlottesville, Va., area, examined selling prices and Zestimates of all 21 homes sold that month in the nearby community of Lake Monticello.

On 17 sales Zillow overestimated values, including two houses that sold for 61 percent below the Zestimate. In Carlsbad, Calif., Jeff Dowler, an agent with Solutions Real Estate, did a similar analysis on sales in two ZIP codes.

He found that Zestimates came in below the selling price 70 percent of the time, with disparities ranging as high as $70,000.

In 25 percent of the sales, Zestimates were higher than the contract price. In 95 percent of the cases, he said, “Zestimates were wrong. That does not inspire a lot of confidence, at least not for me.”

In a second ZIP code, Dowler found that 100 percent of Zestimates were inaccurate and that disparities were as large as $190,000.

So what do you do now that you’ve got the scoop on Zestimate accuracy? Most important, take Rascoff’s advice: Look at them as no more than starting points in pricing discussions with the real authorities on local real-estate values — experienced agents and appraisers. Zestimates are hardly gospel — often far from it.

Ken Harney’s email address is kenharney@earthlink.net



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