Mine is simple but easy to build and add on to in the future. 4'W x 10'L using 2" X 10"s for frame with decking on top. Anchored at 4 corners by 6"x 6"s bolted to them. Cost about $200.00 to build. It originally wanted to put another 4' L 10' W section bolted to it for a total length of 20' but now I decided to add a 12' x 12'square on it for more room to sit. Nothing fancy but it is strong and functions.