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Jan 2, 2012. Messages. 3. Apr 3, 2016. #6. for new construction of such a garage structure, I would think $100-125 per square foot for stick-built is a good start. So, minimums... ground floor 20x20 = 400 sq ft = $40K to start. upstairs 10x20 (avg) = 200 sq ft = $20K adder. It will be *really* simple to drive up these numbers.
Now you should Sheetrock the ceiling. Frame up a simple access hole large enough to at least climb up and sit on your ceiling joists; now low in some insulation (easier than crawling around trying to lay insulation). If you have soffits add vents if needed.