Depends on weather or not you are married.
One guy in Canada built his in his 2nd floor apartment and when it was done he removed a window and lowered it to a friend standing outside. Actually more then one guy has done that , several have , even a few on the Texas coast line of the Gulf.
Some folks had built those temporary covers ( from PVC Pipe and a tarp) to make a boat under.
Others have built them in there living rooms , spare bedrooms , hallways , you know the area you have. I think one guy actually rented one of the "U"Store it areas for a month or two to build one in.
:lol: I have even thought of doing that in the summertime since my shop is not air conditioned and gets really hot in there. Plus I would not be stepping over the stuff the wife likes to store in my shop.
My guess on where to build one is like building the boat , it takes imagination on what you want to do and how to do it.
Chuck.