My shop is 40x60
A few things I did built up to foundation so I could build out the second floor for another 400 sqft without having to make any changes (just frame and go). Added bonus room trusses above the second floor added 200 sqft and hides all furnaces easy access with pull down ladder. I also added pluming in the foundation, just because it cost pennies to do and you never know. It's tall enought to add a shed sytle roof to 3 of the sides an never effect any of the upstairs windows or main roof. I could add another 2000 sqft with out any engineering needed, because I did it on the front end. one section of the floor was poured 12" thick for a large lift
