Decks can be connected to or detached from a house. Decking materials include softwoods, tropical hardwoods, synthetic woods, and pressure-treated lumber. Then there’s the type of deck you desire (e.g., wraparound or pool deck), along with shape, size, and even placement pattern of the wood. Furthermore, decks might require a blueprint and engineering, as well as a permit from your local building department. Here are 20 outdoor deck design ideas to help you get started.