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1 Home addition cost estimates of $80 to $130 per square foot for a basic family room addition is common. 2  If the home addition includes a bathroom and/or a kitchen, the room addition costs can easily escalate to $200-250 per square foot. 3  Quality and materials used are the other cost factors in a home addition.
Cost per square foot depends on the size and style of home you want to build, as well as the materials and features you put into your house. As a general estimate, costs would start at about $85/sq. ft, but could exceed $200/ sq ft., depending on which of the three basic home styles you choose.