Lean to shed plans the lean to shed style is one of our most popular designs. our plans are designed to aid both the beginning builder and the seasoned professional to successfully build a lean to shed. our plans show detailed information like the location of every board in all the shed walls and shed floor.. How to build a lean-to shed: i heat my home with wood, mostly. i have a charmaster forced air wood/oil furnace in the basement of our old farm house in southern michigan. the fuel oil burner is back up for the wood burner and shares the combustion chamber with the wood. i bur.... Afterwards, you have to build the back wall of the lean to shed and to install it on the flooring, in the same way described above. as you can see in the image, you have to cut the top of the wall studs at 17.5