Many siding contractors offer a rough exterior siding estimate based on square footage of your home. Unfortunately, these numbers are very inaccurate. The final cost will depend on a number of factors, such as: the slope of the ground, the height of your home, the number of dormers, windows and doors, as well as the type of trim and J-channel.
Houses are not flat. Therefore, when a siding contractor presents a quote based on the square footage of your home, be cautious and prepare to pay more.