Three composter designs you can build yourself
You can build a working composter from materials you likely have or can buy cheaply: a plastic bin with a lid, wooden pallets, or a wire cylinder. The simplest is a plastic storage bin drilled with holes for air flow. The cheapest is four wooden pallets wired together into a square. The fastest to fill is a wire bin because its open sides let you add material from any direction. All three work. Which one you choose depends on how much space you have, how much compost you want to make, and whether you mind spending an afternoon with a drill or wire cutters.
A finished composter does one job: hold a pile of kitchen scraps and yard waste while air and moisture break it down into dark, crumbly material you can mix into soil. You do not need a composter to compost — you can pile material on the ground — but a bin keeps rodents out, speeds decomposition by concentrating heat, and looks neater in a yard or on a patio.
Key Takeaways
- A plastic bin composter takes two hours to build and costs under $30 if you already own a drill.
- A wooden pallet composter costs $0 to $20 and requires only wire or zip ties, no power tools.
- A wire cylinder composter is fastest to load but offers no rodent protection and works best in mild climates.
- All three designs need drainage holes at the bottom and air holes on the sides to prevent rot and smell.
- The size that works for you depends on how much kitchen waste you produce weekly and how much finished compost you want to harvest at once.
Plastic bin composter: the easiest build
A plastic storage bin with a lid is the fastest composter to build and the most compact. Buy a 18-gallon or larger opaque plastic bin with a tight-fitting lid — clear plastic lets light in and can heat up too much in sun. Drill holes in the bottom for drainage, holes in the sides for air flow, and holes in the lid so you can add material without removing it entirely. Space the side holes about 4 inches apart in a grid pattern. Drill the bottom holes in rows, also about 4 inches apart.
Place the bin on a pallet or wooden blocks so air can flow underneath, or set it on soil if you want worms and insects to move in from below. Add a layer of coarse material — twigs, straw, or shredded paper — at the bottom to keep the drainage holes from clogging. Then add your kitchen scraps and yard waste in layers, alternating wet (food scraps, grass clippings) and dry (shredded paper, leaves, wood chips). Keep the pile as moist as a wrung-out sponge. In warm weather, you can have finished compost in 6 to 8 weeks. In cold weather, it takes 3 to 6 months or longer.
Wooden pallet composter: the cheapest build
Four wooden pallets wired or zip-tied together into a square cost almost nothing if you can find free pallets — check behind grocery stores, garden centers, or warehouses. Inspect each pallet for rot, mold, or chemical stamps (avoid pallets marked "HT" for heat-treated if you plan to use the compost on vegetables, though most heat-treated pallets are safe). Stand the pallets on edge so the slats run vertically, creating gaps between them for air flow. Wire the four corners together tightly with wire or heavy-duty zip ties, or bolt them with corner brackets.
Line the inside with landscape fabric or cardboard to slow material from falling through the gaps, but leave the bottom open to the soil so drainage happens naturally and organisms can move in. Add material the same way as a bin composter: coarse layer first, then alternating wet and dry. This design holds more volume than a bin and is straightforward to expand — add a fifth pallet on top when the pile gets tall. To harvest finished compost, unbolt one side, pull out the finished material from the bottom, and reassemble.
Wire cylinder composter: the fastest to load
A cylinder of wire fencing or hardware cloth, 3 to 4 feet tall and 3 feet in diameter, is the quickest to build and the easiest to add material to from any angle. Buy a roll of 4-foot-wide wire fencing or 1/2-inch hardware cloth, form it into a circle, and find the overlapping ends with wire or zip ties. You can also buy pre-made wire bins online, though they cost more than building one yourself.
Set the cylinder directly on soil or grass — there is no bottom, so drainage and organism access happen naturally. Line the inside with landscape fabric or cardboard if you want to slow material from falling through, but this is optional. Add material in layers like the other designs. This composter heats up quickly because of its open sides and tall shape, so it can produce finished compost in 4 to 6 weeks in warm weather. The trade-off is that rodents can burrow underneath or reach through the wire, so it works best if you avoid meat, dairy, and oils, and if you live where winters are cold enough to freeze the pile solid.
What to add and what to avoid
Add kitchen scraps (vegetable and fruit peels, coffee grounds, eggshells, cooked grains), yard waste (grass clippings, leaves, plant trimmings, wood chips), and paper products (shredded newspaper, cardboard, paper bags). Avoid meat, fish, dairy, oils, and pet waste — these attract rodents and create smell. Avoid diseased plants and weeds with seeds; if your pile does not heat above 140 degrees Fahrenheit, these will survive and spread in your garden. Avoid glossy or colored paper, which may contain chemicals.
The ratio that works best is roughly three parts dry material (leaves, shredded paper, wood chips) to one part wet material (food scraps, grass clippings). If your pile smells like ammonia or rotten eggs, add more dry material and turn it. If it is not breaking down, add more wet material and make sure it stays moist. If it is soggy, add dry material and drill more air holes.
Maintenance and harvesting
Turn your pile every week or two by moving material from the outside to the center, where it is hottest. This speeds decomposition but is not required — an unturned pile will compost, just more slowly. Water the pile if it dries out; it should feel like a wrung-out sponge. In cold months, pile material higher and add more dry material to insulate the center.
Finished compost is dark brown or black, crumbly, and smells like soil. It should not smell like ammonia or rot. Harvest it from the bottom of the pile by removing the front panel or unbolt one side of a pallet bin. Sift out any material that has not fully broken down and return it to the top of the new pile. Use finished compost to amend garden beds, potted plants, or lawn. One plastic bin composter can produce 10 to 15 gallons of finished compost every 2 to 3 months in warm weather.
Comparing the three designs
| Design | Cost | Build Time | Capacity | Speed | Rodent Risk |
|---|---|---|---|---|---|
| Plastic bin | $20–$40 | 2 hours | 18–50 gallons | 6–8 weeks (warm) | Low (lid seals) |
| Wooden pallets | $0–$20 | 1 hour | 27+ cubic feet | 8–12 weeks (warm) | Medium (gaps) |
| Wire cylinder | $15–$30 | 30 minutes | 27+ cubic feet | 4–6 weeks (warm) | High (open sides) |
Frequently Asked Questions
Do I need to buy special tools to build a composter?
A plastic bin composter needs a power drill with a bit set, which costs $30 to $50 if you do not own one. A pallet composter needs only wire cutters or heavy-duty zip ties — no power tools. A wire cylinder needs wire cutters and possibly pliers. If you do not have a drill, the pallet design is your cheapest option.
Can I put meat or fish in my composter?
You can, but it will attract rats and raccoons and create strong odor. If you want to compost meat or fish, use a sealed plastic bin composter in a location where rodents cannot dig underneath, keep the pile very hot by turning it weekly, and avoid adding it during warm months when smell travels farthest. Most home composters work better if you stick to plant material.
How long does it take to get finished compost?
In warm weather (above 60 degrees), a turned pile takes 4 to 8 weeks. An unturned pile takes 3 to 6 months. In cold weather, decomposition slows dramatically — a pile may take 6 months to a year or longer. A wire cylinder composter heats up fastest because of its shape and open sides, so it is quickest in warm climates.
What if my composter smells bad?
Rotten-egg or ammonia smell means the pile is too wet or has too much nitrogen (food scraps). Add dry material like shredded paper or leaves, turn the pile, and drill more air holes if you have not already. If the smell is strong, you may have added meat or dairy — remove it if you can and avoid it going forward.
Can I use finished compost right away or does it need to cure?
Finished compost is ready to use when ready. If it still contains some partially broken-down material, sift those pieces out and return them to the new pile. Some gardeners let finished compost sit for a few weeks before using it, but this is not required — it will not improve further.