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I am thinking of adding a floor to the top of my townhouse and digging out my very cramped, low basement to make that useable space as well. It will be very expensive to do this, as extensive foundational work will be required. Still, I could gain 700 square feet below and 500-600 square feet above. (I don’t want to add onto the back of the building or move to a larger place for other reasons.) This will be a long term investment that I will both live and work in. What’s an appropriate budget for the project? If I come in under $500/square foot, all inclusive (for architect, expediting, and engineers as well as the actual construction) — which I think is well under market rates in my neighborhood, the North Slope — am I coming in ahead?