Question: how many square feet is my house roof?
Answer: Determine the square footage of one floor of your home. (For example, if you have a two-story home that's 2,600 square feet, one floor would be 1,300 square feet.) Multiply this number by your most recent result to get the estimated square footage of your roof. (1,300 x 1.05 = 1,365 square feet.)