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1. Decide on the square footage of the room you will be adding to your home. Room additions can cost up to 50 percent higher, between $80 and $130 per square foot before considering wiring and plumbing, than that same room had been constructed with the rest of the house, according to the Home Addition Plus website.oom additions can cost up to 50 percent higher, between $80 and $130 per square foot before considering wiring and plumbing, than that same room had been constructed with the rest of the house, according to the Home Addition Plus website.
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.oom addition cost estimates are commonly 30-50% higher on a cost per square foot basis then building a new home, due to the fact that a room addition typically is more complicated to build.