Moved to my present location about 20 years ago. My spouse had 1 major requirement: The shop must be outside the house so that the sawdust and other dirt gets knocked off before you enter.
The place we bought had a 24' x 36' "pole barn". Sheet metal over heavy wood frame, wired 220 volt, just used for storage by previous owner.
I remodeled; split the 36' length into 3 parts. South part has library, office and a head. Middle part is for wood work with 1 bench, band saw on moveable base, floor mount drill press, browning cabinet, finish drying cabinet, stock storage and other miscellaneous storage and also a 9' x 9' roll-up door for large thing access. North part is further divided in 2 parts: 2/3 is metal work with mill-drill, 12x36 metal lathe, metal cutting band saw, and floor mount drill press, and wwork bench w? machinist vise; other 1/3 is grinding , polishing and welding. Have people access dors in each of the 4 corners, one window in office access door, plastic windows between interior rooms. We have a mild climate and I double insulated the walls and ceiling when wiring and dry wall installation. 1500 watt electric heater in each room serves when required.
Has prooved to be just right for my needs and didn't cost too much.
Dave Dolliver