You can make a useful garden compost bin from four sound wooden pallets: three fixed walls and a removable front. The important decisions come before fixing anything together: choose suitable reclaimed timber, allow room to empty the bay, and check that the posts and connections will hold the walls securely.
This guide covers building the container. For the ingredients and management of the heap inside it, follow our practical compost-heap guide.
Table of Contents
Is a pallet compost bin right for your garden?
A pallet bay suits a garden that produces enough plant material to justify a fairly large container. It gives you a broad opening for a fork, but takes more space than a compact plastic bin and is not a sealed food-waste system. Compare the alternatives in our guide to compost-bin types and capacity before collecting materials.
The RHS recommends a sheltered position in partial or full shade, with easy access. An earth base provides drainage and access for soil organisms. This particular design uses posts set in the ground; if your only site is a patio, read our compost-bin guidance for paving and choose a structure that does not depend on driving posts through it.
Materials and measurements
The basic structure below follows the four-post pallet layout in WWF’s composting activity guide. Gather four similar pallets and four strong wooden posts, at least 1.8 m long and 5 cm in diameter or square section. You also need suitable outdoor fixings or strong rope, a tape measure, a spade, a hammer or post-driving tool, work gloves and eye protection.
Measure the actual pallets, including their thickness. For example, a panel measuring 1,200 mm by 1,000 mm will make a wall approximately 1,000 mm high when its longer edge rests on the ground. That is a planning example, not a standard size for every pallet. The finished footprint depends on how the corners meet; do not buy posts or mark a permanent square from the panel width alone.
| Check before building | What to record |
|---|---|
| Panel dimensions | Width, height and thickness of each pallet; choose a front panel you can safely move. |
| Dry assembly | The outside width and depth with all four panels in their intended positions. |
| Working space | Where you will stand with a fork, place a wheelbarrow and set down the removed front. |
| Future access | Whether you can reach the fixed joints to inspect and repair them after filling. |
Choose pallets with a known history
Ask the owner’s permission before taking pallets. Reject rotten boards, damaged joints, projecting nails and timber with unidentified paint, oily patches or chemical spills. Do not rely on a pallet’s clean-looking surface as proof of its previous use.
The UK Wood Packaging Material Marking Programme explains that the treatment code HT means heat treatment. It does not certify the wood’s later storage or cargo history. Maine Organic Farmers and Gardeners’ pallet-bin guidance also advises checking for spills and avoiding pallets marked MB, which denotes methyl-bromide treatment. If you cannot establish what the timber is or whether it is contaminated, use known suitable timber instead.
Build the bay in five stages
1. Set out the walls before digging
Clear and level the chosen patch. Stand the back pallet on its long edge, then position the sides at right angles. Place the fourth pallet across the front temporarily. This dry assembly lets you check the corners and the opening before committing to post positions. Have another person support panels while you work; do not leave them balanced upright.
2. Anchor the four corners
Mark a post position at each corner, clear the pallets away and check for buried services before digging or driving. Set the posts firmly enough for the ground and intended wall height; the WWF guide does not prescribe a universal burial depth. Stop if loose, shallow or obstructed ground will not support the structure securely.
3. Fix the back and side panels
Secure the three fixed pallets to the posts, keeping the corners close enough to contain the heap. Select fixings that properly engage the sound timber without leaving exposed sharp ends. Check each wall and connection before adding material. A leaning panel or shifting post needs correcting while the bay is empty.
4. Make the front removable
Tie the fourth pallet securely at both ends so it can be removed for access. The BBC Gardeners’ World pallet-bin project also makes front access part of its design, although it uses a different stake arrangement. Do not permanently nail every side shut and leave yourself a metre-high wall to shovel over.
Support the front before releasing its ties. If the contents are pressing against it, remove material from above first rather than letting the panel fall outwards. A heavy panel you cannot handle comfortably is a reason to reconsider the front design before filling.
5. Cover the contents and inspect the bay
A removable cover helps prevent excessive rain entering. The Soil Association recommends covering compost while retaining air gaps. Secure a tarpaulin against wind without wrapping the entire bay airtight. Avoid a heavy improvised roof that the pallet walls were never designed to support. Recheck ties, fixings and posts periodically, particularly after moving the front or turning the heap.
Start using it without creating a new problem
Mix soft green plant waste with brown material such as torn cardboard and chopped woody stems. Garden Organic’s ingredient guidance excludes meat, fish, dairy and cooked food from an ordinary home heap. This slatted bay is not rodent-proof; use our kitchen-scrap and pest-management guide when deciding what to add.
Do not judge a new autumn bay by whether it produces immediate heat. RHS winter advice explains that decomposition slows in cold weather and that covering an open heap helps keep excessive rain out. Our winter composting guide covers the seasonal adjustments.
Leave space for a second bay if your garden may eventually need one: it can make separating batches and moving material easier. You do not need to build it on day one. Check the contents rather than assuming a fixed completion date; our signs that compost is ready explain what to look for.
Research and design limits
We checked the linked construction and composting guidance on 25 October 2026. This is a researched pallet-bay design, not a claim that we built or load-tested it. Reclaimed materials and soil conditions vary, so the measurements must come from your own panels and the stability checks from your own site.