Is there an average cost per sq ft for a two story addition in Orange County Ca?

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Do you mean how much to build and addition, or approximately how much the addition would add to the value of the dwelling? RE: building... I think that you should get estimates from a licensed contractor in your area they would definitely have a better idea how much per SF to build the addition. I would guestimate $125.00 per SF to add to the dwelling. How much of that cost you would recoup in this market is another good question to ask...it might be better to sell and buy what you need.