[IL SS 1988]

In our neighborhood, I know of three people who built two car detached garage with an upstairs. The upstairs wasn't even finished and I know they had $60,000 in them. Now these were upscale with full brick, expensive windows, etc. Contractor did 100%

I built a 2 car 26' x 28' with attic trusses, full, brick, and unfinished interior. I did 50% of the work except for the masonry. I had $30,000 into it when it was said and done. But like i said it was full brick, dormers, and $2500 of windows.
This was the St. Louis area.

I would guess you would have $40,000 in it if the interior was finished and you did some of the work yourself with vinyl siding, cheaper windows and doors. You could easily be over $100,000 for a top of the line product 100% done by a contractor.

Go to eplans or one of the numerous online garage plan sites and there are some amazing apartment garages.