why is my square footage on zillow different when I do the math

[Randall Re II]

When I look at my properties blue print, I add up the math and the livable property is around 1660 sq. ft. but when I look on zillow, etc... they all say 1200ish sq ft. What am I missing here, I'm not bad at math, and curious what I'm doing wrong?

[Nathan Gesner]

I'm getting about the same as you. Zillow doesn't actually do the math; they just take whatever data is reported to them from whatever source. Have you checked county records? Even those can be wrong. Maybe an addition was never calculated or the original plans changed and weren't reported?

I would go with your number. It's up to a buyer/renter to verify.