The fastest way to start composting is a wooden pallet bin
A pallet bin is the simplest compost container you can build. You need four wooden pallets, wire or zip ties, and a flat patch of ground. Stand the pallets on their edges to form a square, fasten the corners together with wire, and leave one side unfastened so you can pull it open to remove finished compost from the bottom. The whole job takes under an hour and costs nothing if you find free pallets at a loading dock or grocery store.
Pallets work because they have gaps that let air flow through the pile — essential for the bacteria that break down your scraps. The wood itself will eventually rot and become part of your compost, which is fine. If you want the bin to last longer, choose pallets that haven't been chemically treated (avoid any stamped with "MB", which means methyl bromide).
If you cannot find pallets or prefer something neater, a wire cylinder made from chicken wire or hardware cloth works just as well. Bend a 10-foot length of wire into a circle about 3 feet across, fasten the ends with zip ties, and set it on the ground. This style is lighter to move and easier to disassemble when you're done, but offers less wind protection than a wooden box.
Key Takeaways
- A four-pallet bin with one removable side takes under an hour to build and costs nothing if you source free pallets from local businesses.
- Air flow through the pile is critical — choose designs with gaps or openings rather than solid walls, or your compost will rot slowly and smell.
- You do not need a lid, but one keeps rain from waterlogging the pile and animals from digging through it.
- The bin itself does not have to be fancy; a wire cylinder or stacked cinder blocks work as well as wood, and cost less to replace when they wear out.
- Place your bin on bare ground, not concrete, so worms and microbes can move in from below.
Choosing the right size and location
A bin that is 3 feet wide, 3 feet deep, and 3 feet tall holds enough material to heat up and decompose fast — usually within three to six months. Smaller bins work, but the pile cools down faster and takes longer to break down. Larger bins are harder to turn and can become waterlogged in the middle.
Place your bin in a spot that gets at least a few hours of sun each day and drains well. Avoid low spots where water pools after rain, and keep it at least a few feet from your house so you do not attract rodents to your foundation. A corner of the yard or a side garden bed works well. If you live in an apartment or have no yard space, a small plastic tumbler bin (about 2 feet tall) sits on a balcony or patio and takes up almost no room.
Building a wooden box bin with a hinged lid
If you want something more durable than pallets, build a box from untreated wood boards. Use 2-by-10 or 2-by-12 lumber, cut four pieces to 3 feet long, and screw them together at the corners with 3-inch deck screws. Drill a few holes near the bottom of each side for drainage and air flow.
For a lid, attach two boards across the top with hinges so you can flip it open to add scraps and check the pile. A lid is not required — many people skip it — but it keeps heavy rain from soaking the pile and stops animals from getting in. If you do not use a lid, the pile will dry out faster in summer, so you may need to water it occasionally.
Untreated wood lasts five to ten years before it rots enough to need replacing. Pressure-treated wood lasts longer but can leach chemicals into your compost, so avoid it. Cedar or redwood resists rot naturally but costs more. For most people, plain pine or fir is the best balance of cost and durability.
Using cinder blocks or concrete for a permanent bin
Stack cinder blocks four high to form a 3-foot-tall square, and leave the gaps in the blocks open for air flow — do not fill them with mortar. This design lasts decades and requires no tools or fasteners. You can build it in an afternoon and move it later if you need to.
The main drawback is that cinder blocks do not hold heat as well as wood, so your pile may decompose a bit slower. They also absorb and hold moisture, which can make the center of the pile soggy. If you live in a wet climate, add a layer of straw or leaves on the ground before you start filling the bin to help with drainage.
Assembling a plastic tumbler bin for small spaces
A tumbler bin is a sealed plastic drum mounted on a frame so you can spin it to mix the compost. These cost between $100 and $300 and work well if you have limited space or want faster results. The sealed design keeps out pests and rain, and spinning the drum every few days speeds up decomposition to six to eight weeks instead of months.
Tumbler bins are smaller — usually 30 to 50 gallons — so you cannot add as much material at once. They also require more hands-on work: you have to spin them regularly and monitor moisture carefully so the pile does not dry out. If you forget to turn it for weeks, decomposition slows down.
Most tumblers come fully assembled; you just need to set them on level ground and start adding scraps. Some models have a door at the bottom to pull out finished compost, while others require you to empty the whole drum when it is full.
What to avoid when building your bin
Do not use treated wood, which can leach copper or arsenic into your compost. Do not build the bin on concrete or asphalt, which blocks worms and beneficial insects from entering from below. Do not make it so tall or deep that you cannot reach the center to turn the pile — 3 feet is the practical limit for most people.
Avoid designs with solid bottoms or walls with no gaps. Your compost needs air to decompose properly; without it, the pile becomes anaerobic (oxygen-starved) and smells like rotten eggs. If you want to keep rodents out, use hardware cloth (a fine metal mesh) on the bottom instead of solid wood.
Getting your bin ready to use
Once your bin is built, add a 4-inch layer of coarse material on the bottom — twigs, straw, or shredded paper — to create air pockets. Then start layering your scraps: alternating "brown" materials (dry leaves, cardboard, straw) with "green" materials (grass clippings, food scraps, fresh plant trimmings). Keep the pile as moist as a wrung-out sponge.
You do not need to add anything special to start decomposition. Bacteria and fungi are already in the soil and on your scraps; they will colonize the pile on their own. If you want to speed things up, you can add a shovelful of finished compost or garden soil from a friend's pile, which introduces active microbes, but it is not necessary.
Frequently Asked Questions
Do I need a lid on my compost bin?
No, but a lid helps. It keeps heavy rain from waterlogging the pile, stops animals from digging through it, and reduces smell. If you skip the lid, your pile will dry out faster in hot weather, so you may need to water it or add more green materials to keep it moist.
Can I use treated wood to build my bin?
No. Pressure-treated wood contains chemicals that can leach into your compost and eventually into your garden soil. Use untreated pine, fir, cedar, or redwood instead. Pallets are fine as long as they are not stamped with "MB" (methyl bromide).
How much does it cost to build a compost bin?
A pallet bin costs nothing if you find free pallets. A wire cylinder costs $10 to $20. A wooden box built from lumber costs $30 to $60. A plastic tumbler bin costs $100 to $300. The cheapest option is always pallets or wire, and they work just as well as anything else.
What size bin do I need?
A 3-by-3-by-3-foot bin is the standard size and decomposes material in three to six months. Smaller bins work but take longer. If you have very little space, a 2-foot tumbler bin works, though you will need to empty it more often.
Can I put my compost bin on concrete?
You can, but it is not ideal. Concrete blocks worms and beneficial insects from entering the pile from below, which slows decomposition. If you must use concrete, drill holes in it or lay hardware cloth on top of it before you build your bin.