Plastic compost bins are available commercially or you can make your own. There are several possible designs for homemade compost containers, including the closed-air composter recommended by the Alameda County (California) Waste Management Authority. According to ACWMA, you should consider the materials you will compost, where you want to place the compost container, and your building skills before choosing a homemade composter project. The closed-air composter is suitable for most skill levels.
Build a Closed Air Composter
Using the utility knife, cut out the bottom of the plastic trash can. Leave a 1 inch rim.
With the tin snips cut the hardware cloth the same size and shape as the bottom of the can.
Attach the hardware cloth to the bottom of the outside of the can with the screws spaced 4 inches apart, with the hand screwdriver, Poke the holes with the nail and hammer first, then put in the screws. No pre-drilling is necessary if you are using a power drill. Be sure the screen fits tightly so there are no holes larger than 1/4 inch.
Install the bin by digging a 12 to 18 inch hole in the ground. Place the bin in the hole. It will be partially under ground and partially above ground.
Add layers of materials to be composted.Alternate green layers of grass clippings, plants and kitchen scraps with brown layers of dried leaves, and the like. Keep the bin moist but not wringing wet. Place the garbage can lid on the top to begin the heating-up process necessary for composting.