Built 3 years ago. Treated subfloor 2x6, double box 16" on center 3/4"plywood floor, 2x4 Douglas fur 16"on center walls, 2x6 Douglas fur rafters 16" on center, Exterior walls 1-11 cement board panels, roof 1/2"plywood w/ roll roofing, no leaks. 2 sliding windows double pain, solid 36"x 6'8 door. Interior workbench & shelving. Material alone when built $2,300. Plus 3 weeks labor. Can deliver!