zestimate change or system issue???

Profile picture for gfarry
Yesterday, zestimate for my house (241 Mainsail Ct, Foster City, CA 94404) was $988K. Today, it shows $950K and its history graph displays the price was about that for last 2 months when it never was below $960K.

Is that zestimate changing  past data or system issue??? 

Either way it shows there should not be trust in your data. Especially, if you keep correcting your past data.
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June 13 2011 - Foster City
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Profile picture for wetdawgs
Today Zillow updated their Zestimate algorithm , and included some historical calculations.  You can read more here.
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June 13 2011
Profile picture for gfarry
Thank you guys - I got the picture.
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June 14 2011
Zillow does a major change in its estimate, which affected to many house, however, your home is still worth at $974K.
http://homesand.net/QuickComps.aspx?241+Mainsail+Ct+Foster+City+CA&citystatezip=94404?Map=1?AllComps=True
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June 13 2011
Profile picture for David Gowans
The thing about Zillow is, the data that enters the Zillow system usually takes some time to get there. For example: I sell my home on Comet Dr (Foster City) on 1 June (transaction closed). It gets recorded on June 3rd. This sale normally won't reach the Zillow Database for weeks (sometimes a few months) after the sale is recorded.

Once it does catch up, it will adjust the estimate for each home in the area a little, or a lot this there's a big price disparity from the norm. Now, picture several sales catching up around the same time. This will explain some of the significant changes you'll see, as well as a change in data from 2 months before, because thats when the sales actually occurred.

Try to use Zillow for what it is: a ballpark estimation. If you need a tighter estimate, any Realtor can do a Market Analysis (CMA) for you that is essentially the same as a Zestimate. The difference is, the Realtor has access to real time information on home sales.

So, I recommend you contact a Realtor for a really good idea of your value. Almost all Realtors will do this for you for free, and a few of us will do so without hassling you for a listing afterward.

Hope you find this helpful.

David Gowans
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June 13 2011
 

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