The industry standard method for calculating the price per square foot is to divide the total cost of the home by the livable square feet within the home. It's important to note that 'livable square feet' does not account for areas such as porches, garages, driveways, or unfinished spaces, like attics. However, the expenses associated with these areas are factored into the total cost. I'd like to emphasize this: without each essential piece of data, the value of cost per square foot significantly diminishes. This is particularly true given that different builders may interpret and calculate these costs in varied ways.