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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.
If you add something simple like a bedroom or family room the cost will be $100 to $150 per sq foot. If the add-on includes a bathroom, it will be much more. It also depends on your existing home.he amount of money that it will cost depends on what you want in the room addition. Recently, one of my clients asked for bids for a 400 square foot room addition for his home. The bids that he received were in the range of $35,000 to $45,000.