I want to say I love Zillow, I have been a Premier Agent with Zillow for over a year and I have met some amazing clients through Zillow. Zillow attracts clients in my area that are a perfect fit for me. I was a huge Zillow user before I became a real estate agent. I like their statistical data, I am a numbers driven person and so are 99% of the clients are work with. However, some times the numbers are hard to follow and they lead to more questions than answers in the real estate markets I work in.
Let me explain why there is some confusion on house valutation especially in the Silicon Valley. Unlike many areas in the country, the Silicon Valley does not have large developments of recently built homes that are very similar in size and ammenities. Most of the large developments of houses occured in the 1950's to the 1970's here in Silicon Valley. Many houses have been replaced, added onto and or remodeled. A few of them have not been touched in since the day they were built. So the variance is large in any one neighborhood
If you go to Zillow and look up the accuracy of their Zestimate it explains very well about their estimation process but it seems that very few people bother to read this page:-)
http://www.zillow.com/howto/DataCoverageZestimateAccuracy.htm
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