Build a compost bin from reclaimed timber: plan, assemble and maintain

Start with the location and everyday use

A compost bin belongs to a daily route: bring scraps, add leaves, turn the contents and remove finished compost. Mark its footprint with stakes before building. Allow for an imaginary open door and carry a bucket along the route with the people who will use it. Choose accessible ground that does not flood and leave working space in front. A distant corner can be an awkward choice if getting there discourages regular use.

Gather materials before shopping

You will need sound boards of known origin without chemical treatment, four uprights, outdoor fixings, brackets and removable fasteners for the front. Gather a tape measure, pencil, square, saw, driver, clamps and protection appropriate to the tools. Reject painted, contaminated timber or wood with an unknown treatment. Reclaimed does not automatically mean suitable.

Our suggested arrangement has three fixed panels and a removable front. Dimensions depend on available timber, access and expected volume. This is an assembly approach rather than a dimensioned construction drawing: dry-fit parts before cutting and seek skilled help if the joints are unfamiliar.

Assemble in five stages

1. Measure usable lengths, sketch each panel and count fixings before buying. Remove nails, inspect the wood and smooth handling surfaces.
2. Lay the uprights for one side flat and attach the boards, leaving ventilation openings. Make the second side in the same way. Predrill where required by the timber or fixings.
3. Join both sides with the rear boards, check the angles and reinforce joints. Check that the empty structure resists distortion before filling it.
4. Build the front separately and attach it with removable fasteners reachable from outside. It should allow turning and compost removal without dismantling the entire bin.
5. Set the bin level on your chosen ground without a sealed base. Correct any tendency to tip. If a top cover is needed, keep it manageable and do not seal the bin airtight.

Keep the compost working

ADEME guidance emphasises varied materials, aeration and moisture management. Keep dry leaves or small woody material nearby. Begin with identifiable plant scraps and garden materials; extend accepted inputs using local compost guidance. If the contents become compact and unpleasant-smelling, examine excess moisture and lack of air. A calendar alone cannot establish maturity.

Share the work as well

Agree who brings scraps, turns the contents, checks conditions and removes compost. A notice can list accepted inputs and a contact person. After several weeks, review access, the removable front and workload: is one person doing everything? In the Permah community, share the dimensions you actually built and what you would change.