You are adding an addition to your home you are adding a 12x16 living room and a 12x12 beedroom and a half bath what will this cost and how much will this raise your value?

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This answer depends significantly on the location of your home and the level of finish of these rooms. I would budget, very generally, $110-$175 / SF for this project. Since it includes a bathroom, the cost may be on the higher end.

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Good luck!