Once you’ve decided on the location of your deck, measure the length and width of the total area. Using a string line and pegs into the ground is a great way to measure and visualise your deck. Break down the area into smaller rectangles if you’re planning on building an unusual shape. It’s important to decide on the direction you wish to install your decking boards as early as possible, as this will limit cutting and wastage and will help you to be as accurate as possible when ordering the materials you need.