I had a 15’ wide by 30’ long shed built by the Amish, had them install the roof, doors, windows and house wrap the plywood exterior. I sided it to match the house and did the soffit and fascia myself. I put in a buried PVC conduit and pulled a 100 amp service through and installed the panel and wiring, etc. I then partitioned the interior exactly in half, insulated the walls (16” stud centers) with R-13, installed a reflective barrier onto the trusses to seal off that end of the “shop”. I’ve got HF woodworker bench, some additional work surfaces as well as a drill press, band saw, fly tying desk, vertical shelving and have room to spare. I heat it with one of those oil filled radiant heaters. Even in near zero weather, it’s comfortable. If I need to use a table saw or other large power tool in that space, I simply go to the “storage side if the shed and get it. I keep all my seasonal stuff up there, mowers, golf cart, etc. works for me.