My bike space is consists of parts of two rooms in the basement, and is a bit of a mess -- the workshop also has some woodworking tools (most not in pic) and the HVAC, etc -- switching projects is a bit like playing real-life Tetris. lol.gif
The bike storage wall/winter ergometer room (one ergometer for me, one for my stoker/wife) shares space with laundry, wood storage (that's quarter-sawn white oak staked under the bikes), and assorted flotsam.
We have a 12' x 16' shed that stores 3 more tandems and my more frequent riders. Running out of room, which is likely a good thing, as it dampens the acquisitional urge... although I am picking up an interesting n+1 at the end of the week, so...