Pier block foundation with support saddle. Includes digging, setting, leveling w/4x4 treated upright posts, up to 24" high, added overall construction time....$55 per block.
Second floor upgrade Add $16.50 per sq ft.
(includes 9' T-1-11 2x10 2nd floor joist, 5/6" sturdy floor, 2"x10" access ladder, upgraded Barn Style roof)
(Add 50% for peaked dormers)