Home ValueI looked up the house that we bought 2 years ago. It is worth $444 according to Zilliow, since then we've doubled the house in square footage and added 2 more bathrooms and 2 more bedrooms. I don't expect an immediate change in value by Zilliow. A day later the value went up by $2,000, and today the value is $443...how is this possible? Has the new information just not been taken into consideration? Or does it take a while for someone to calculate the new value?August 21 2008 - US00YesReport a ProblemProblemSelect oneOffensive contentIrrelevant contentSpam (pure self-promotion)OtherDetailsYour emailPlease enter a valid email address.Submit CancelContent flaggedWe will review this content. Thanks for helping make the site more useful to everyone. To learn more, read Zillow's Good Neighbor Policy.We're sorry. This service is temporarily unavailable. Please come back later and try again.