Real Esate Professionals provide the following advice on Zillow.
People either swear by Zillow or swear at Zillow depending on how their house is valued. Today, Zillow may be a blight on humanity. Tomorrow it will be better, let us hope, but it may be useful to check Zillow to get an idea of value.
As most Realtors know, you have to look at Zillow with a studied eye and realize that there are some strange valuations. If houses are standard as they are in many areas of California, you can get a better idea by looking at several nearby houses and averaging the value from that.