If for instance, the entire house is 2000 square feet and the price of painting stands at $1.50 per square foot, the total cost for painting your house will be 2000 multiplied by $1.50.This will give you a total of $3000 for painting the entire house.ou also need to know the amount you’re likely to pay for labor. An attempt is made in this write-up to give you the cost estimates for such building processes. Let’s start with painting. Generally, the national average cost for painting in the US stands at $1.25 per square foot.