Most compost bin guides show you one design and declare it the best. The truth is that the right bin depends on how much material you produce, how much space you have, and how quickly you want finished compost. Here are three designs that all produce excellent results.
Design 1: The Pallet Bin
Four pallets wired together at the corners form a 1.2m cube — large enough to generate the heat that speeds decomposition. Stand three pallets on edge in a U shape, wire the corners together with galvanised wire, and add the fourth pallet as a hinged door at the front. The gaps in the pallet boards provide exactly the right amount of aeration. One pallet bin handles the output of a medium to large garden.
Design 2: The Timber Slatted Bin
A slatted timber bin looks more considered and is easier to access. Build a square frame from 50x50mm posts at each corner, and attach horizontal 75x25mm boards with a 25mm gap between each for aeration. Use corrosion-resistant screws — the interior stays damp for most of the year. Make the front boards removable by running two grooves in the corner posts and sliding each board in horizontally. Build two bays side by side if you have room — one receiving material, one maturing.
Design 3: The Wire Hoop
For a small patio or garden with minimal green waste, a wire hoop is all you need. Cut a 3-metre length of heavy-gauge galvanised wire mesh with 50mm square apertures. Form it into a cylinder roughly 900mm in diameter and secure the ends. The hoop is easy to move — lift it off the pile, set it down next to the old pile, and fork the material in to turn it.
What to Compost
A healthy compost pile needs a balance of nitrogen-rich greens (food scraps, fresh grass clippings, young weeds) and carbon-rich browns (cardboard, dead leaves, straw, wood chips). Aim for roughly equal volumes of each by weight. Chop or shred larger pieces to speed breakdown.
FAQ
Can I compost cooked food and meat scraps?
Not in an open bin — cooked food and meat attract rodents. Stick to raw vegetable scraps, fruit peels, coffee grounds, and eggshells.
Why does my compost smell bad?
A foul smell usually means too many greens and not enough browns. Add a thick layer of cardboard or dead leaves and turn the pile.
How do I know when compost is ready?
Finished compost looks dark brown, crumbles easily, and smells like forest soil. If you can still identify original ingredients, it needs more time.
Can I compost diseased plants?
Generally no. Fungal spores and some bacterial pathogens can survive in a home compost pile. Diseased plants are better binned or burned.
How many bins do I need?
One bin works for small quantities. Two bins is ideal for a productive garden — one actively receiving material, one maturing.
See also: How to Build a Raised Bed That Lasts and Best Soil Mix for Raised Beds.