Free deck building designs are available online at Decks.com and TimberTech.com, as of 2015. There are hundreds of plans available from these sites, and both sites are searchable based on a number of refinements.
Decks.com lists deck building designs by elevation, which include low, medium and high elevation plans. Designs are also depicted by images. Simply choose a deck design from the pictures, and select the size from the dropdown menu. With many designs on the site, there are several sizes to choose from.
When searching on TimberTech.com, refine results by single or multi-level decks and deck attributes. Some of the other refinements found on this site include adding a place for dining, an area to install a hot tub or even a lounge area.