You can build the walls on any flat surface, but the shed platform is ideal. Snap chalk lines on the plywood deck, 3-1/2 in. from the edges of the platform, to indicate the inside edge of the walls. Measure to make sure the lines are parallel and 89 in. apart. Then chalk a line down the center (Photo 1). You’ll use this line to make sure the angled top plates meet in the center.
• Improper geographical placement — this is one of the huge mistakes one may make while shed building. It may be too close to your house hence obstructing your beautiful view from your living room or your kitchen as you are cooking. The last thing one would want is not like your house because of a simple thing as a view, so be careful with where you place your shed. One may also build the shed too far away from their house which again is an inconvenience. Who would want to walk from your house to your shed to get some tool you need and you have to trek some long distance? You may also need your shed someplace you can see due to the security reasons. You would want some stupid thief taking your stuff without you see them, would you? Or walking down a snowy lane during a chilly night just so you could get something from your shed. Before building your shed consider all the factors whether positive or negative and then come up with the place in your compound with the most advantages compared to disadvantages.
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.[5]

how to build a shed