Design a deck online free tool automatically prices decks as you design them. Design as many decks as you want free and save up to ten deck designs. Add tables You are ready to launch the Deck Designer. Click the links to the right to create your dream deck. Loading the Deck Designer for the first time could take several DeckDesigner is a free web based tool that lets you design a deck online. It has an interactive interface that guides you through the process of customizing the deck This seven-part series of videos and how-tos shows you how to design and build a wood or composite deck from footers and framing to decking and furnishings.