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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.
The cost per square foot (of finished home) would be $15,000/1400 = $10.71/SF for the smaller home and $15,000/2800 = $5.36 for the larger home. So this is just one example showing how the square foot costs for new construction are effected by many different aspects.