For example, the last three sheds I built were trimmed with white PVC trim boards instead of painted cedar 1 x 4s. This new plastic lumber, which I used for the rake, fascia, frieze and corner boards, is impervious to bugs, warping, splitting or decay, and it never needs painting. Other low-maintenance options include: vinyl or aluminum windows, faux-slate roof shingles, fiberglass or steel doors, composite decking for steps, and fiber-cement siding. (I don't usually recommend aluminum or vinyl siding for sheds; neither material is rugged enough to survive the inevitable beating outbuildings take.)
Build the framework for all four walls. To account for the fact that the front and back walls are different from each other (due to the doorframe in the front) and the side walls must both be sloped (to prevent rain from collecting on the roof), each of these will have to be tackled somewhat differently. It’s easiest to construct the back first, the front second, and the two sides last, as shown in the numbered image below. See How to Frame a Wall for more information before you read the instructions below.