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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.
costs vary widely nationally estimates of room addition costs vary from $ 80 to $ 250 a square foot a simple room addition with a basic foundation and no plumbing generally costs at least $ 100 a square foot with typical internal finishing no expansion of a heating cooling unit and minimal structural changesthe cost per square foot decreases as the size of the addition increasesddition costs vary widely by region and by the size and type of an addition it is cheaper to build up than to build out so adding a room with a foundation is more costly than expanding an attic into a second story get specific estimates before you start a project