The public records are not always accurate, but it is something that you should check-out. I just had to fix a similar problem on my motherâ€™s house as I wanted to make sure this didnâ€™t raise a red flag when she tries to sell. It could be an unpermitted addition or just a miscalculation on the part of the assessor. In my momâ€™s case it was because the assessor didnâ€™t include the enclosed breezeway in the square footage even though it was in the permit that way. It was a 300 square foot difference.