It could be because the county got it wrong, and we check for that and will fix it if they did. If you notice the county has incorrect data about your home, like the wrong # of bedrooms or square footage, you need to let us know! But many times your neighbor’s value appears lower because of how the county “adjusts” the data for each home in order to correctly compare your home with other homes in your neighborhood. Most counties look at LOTS of characteristics and adjust them up or down when comparing homes. The most common ones are square footage, lot size, bedrooms, baths, year built, garage, exterior finishes, and major additions like courtyards, decks, and pools.