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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!

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Q: What is the average cost per square foot to add an addition of 500 sq ft in WA state?
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