Additions
Generally speaking larger and more open spaces are less per square foot than smaller spaces. Building a two-story home addition is generally less per square foot than building a single story because the space shares the same roof and foundation. (Count both floors when calculating square footage of added space if second floor is to be finished or partially finished). Any portion of the existing home that is affected and/or gets remodeled (among other things) has a large impact on the total investment.