I built a 30 x 40 x 10' sidewall with enclosed 10 x 40 lean. Cedar siding, 35 year shingles, 2 windows, walk door, 3 - 9 x 8 insulated garage doors.
2x6 walls
Split the 30 x 40 into a 24 x 30 unheated garage and a 16 x 30 insulated and heated shop.
Shop area has loft storage above it...