re: Questions about adding on a second floor

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I am looking for general costs and other issues assuming additional shoring is not needed.

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Any answer you get here would be a wild arse guess. Whatever you think it is, I'd bet it will be significantly more. First, you need a structural engineer to tell you what is even possible. It's rare that you can simply add on a second floor without having to beef up the foundation. Second, you need an architect to draw something up for you. Be conservative, b/c in my experience, architects don't give a shite about your budget. They will draw whatever you tell them b/c they will be paid by the time a contractor bids it and you freak out at the cost.