My workshop is a converted 3 car garage. It is a work in progress, but getting there slowly. Dimensions are 34' x 26'. It is heated and cooled so I can work year round. I also have a dehumidifier.
I have 4" of foam board/synthetic stucco on the exterior and 6" of insulation in the exterior walls.
I retired from being a chief engineer two years ago and had machinery from my short lived cabinet business from years ago. Just before retiring I purchased several more machines, which included three shapers (Casadea 13.5 hp, Delta 7.5 hp, Geetech 5 hp), tig welding machine (325 amp), Woodmaster 37" double drum sanding machine, Grizzly commercial mortising machine, Powermatic wood lathe, and a lock mortising machine.
The three phase power is supplied by a 30 hp rotary phase converter that I put together using American Rotary control converter. It supplies 400v to the Casadei shaper via transformer and 230v to the Delta shaper and Grizzly mortising machine.
Other equipment: 20" Jet bandsaw, Delta 5hp Unisaw with custom router (with DRO) and outfeed table, 12" Makita miter saws, 20" Powermatic planer, 8" Powermatic jointer, Porter Cable 24" & 16" Omnijig, Delta spindle sander and scroll saw, 37 Makita power tools, and numerous other brands.
The dust control is a Tempest 5 hp system with 7" main trunk line with 5" and 4" drops to machinery.
This is housed in it's own room with 9' filter unit and 2 each 55 gallon drum containers for dust and shavings.