Zillow is not accurate at all. In my market, Redfin has been accurate to within 5% of the price, up or down. However, Redfin is a real estate agency, so they use their estimates and have access to data that Zillow doesn't, and they will adjust the algorithm at a neighborhood level. Zillow is merely a real estate value estimator (they don't use sufficient data to earn the right to call themselves an appraiser nor do t…
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