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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.
So for example, if your room addition plans specify the construction of 400 square feet of family room living space, without any type of bathroom or kitchen area, you can expect to pay $32,000 - $52,000 for a completed addition.y: Mark J. Donovan. Building a room addition is an expensive proposition. Home remodeling contractors typically specify room addition costs in dollars per square foot to provide a rough order of magnitude cost estimate.