There are many factors that influence the design of your deck, and they include: The intended use of the deck. The purpose of the deck whether relaxing, entertainment, pool or family dining affects the design. Available space. Your deck should not take over your outdoor space; it should complement it. If you need more space for your deck, you can build it around obstacles, or you can use a multi-deck system. Unless you have a deck building experience, leave this one to the professionals and only work with what you got. Open or shaded. If the deck is around the pool, you must install a shade (a gazebo or pergola) to keep that harsh Australian sun away. Safety. Familiarise yourself with the building codes relating to safety when building a deck in your backyard.