To install a sliding patio or deck door, first decide a practical, aesthetically logical and structurally sound location for the entranceway. Do not locate a patio door closer than 4 feet from any corner, otherwise the solid-wood sheathing or metal bracing at the corners could be compromised. Also, plan ahead. We chose the door's location in part because it allowed the option of later adding a bathroom at the corner of the adjacent wall. For a step-by-step at the installation process, take a look at this DIY video tutorial.