A bench composter serves a dual purpose in a lawn or yard--it provides comfortable seating so you can relax outdoors, and provides storage space for compost. Compost is a rich organic matter packed with nutrients for garden and container soil, and can be easily made at home using kitchen and yard scrap. The door of this bench compost can easily be opened, allowing a homeowner to turn the compost to speed up decomposition process, and take out compost when it is ready.
Measure two 42-inch lengths of 2-by-4 and cut them with a saw for the back of the bench composter. Cut two 24-inch lengths of 2-by-4 for the front of the box, and another two lengths at 24 ¼ inches for the top of the box and seat support.
Hold the seat support to the back piece so they are flush against each other and the joint is even. Measure and mark 24 inches in the back piece with a marker. Drill two holes on the corner of the back piece where you started measuring, and another two holes near the 24-inch mark. Screw the tapping screws into the holes in the back piece.
Drill two holes on each side of the seat support for the front of the compost bench, and attach the front piece with tapping screws.
Carefully place the plastic seating panels over the seat supports, aligning it so it is even from all sides and flush against it. Secure it into place by drilling six to eight screws so it is set firmly in place and does not shift.
Use a saw to cut six lengths of 2-by-4, each measuring 36 inches long. Secure three of these at the back of the bench, using four screws for each length. Secure the other three lengths along the back of the composting box, using four screws for each length.
Place a hinge in the center of one of the short sides of the plastic seating panel, and attach it using ¼-inch screws. Extend it up so it rests on the top, and attach it place with screws. Repeat the same procedure to attach the second hinge in the center of the other short side. These hinges will enable the door of the compost bench to open upwards.