The cost per square foot to build such a relatively small living space is higher than most people expect it to be. The cost of a home addition compares to the current cost of building a small house.
Carl Heldmann
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The cost of construction per square foot is the same as the cost of an automobile per inch of length.
It is "additive".
Identity of addition means the answer and then add
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The answer varies greatly depending on the level of finishes, use of the new square footage, construction type, etc. Here is a link to a developing series on defining project cost. I highly recommend it: http://meandyourhouse.com/2010/01/defining-remodel-cost/ Good luck!