Build a compost bin with removable front slats
Make an open-bottom garden bin with ventilated sides and a lift-out front for turning the pile.
Lawn & garden · 1 day · Medium
Before you start
Use sound untreated rot-resistant lumber, corrosion-resistant screws, clamped cuts and eye protection. Keep the bin away from structures and drainage routes. This open-top design is for yard waste; use a pest-resistant system where food scraps or local rules require one. Do not climb into the bin or burn treated scraps in it.
Tools and materials
- Cedar cut list: four 4×4 posts at 36 in; twelve 1×6 side slats at 36 in; six 1×6 back slats at 37½ in; six front slats cut to fit (about 28¾ in); four ¾-in-square channel strips at 36 in; two 1×3 braces cut to fit
- Exterior screws: 2-in for slats and braces, 1½-in for channel strips; tape, square, clamps, saw, drill/driver, sanding block and eye protection
Check the problem
Check the site
Choose level well-drained ground with room in front to lift boards and turn compost. Leave access on all sides and keep wet material off fences and building walls.
Check stock before cutting
This layout assumes 4×4 posts are 3½ inches square and 1×6 boards are ¾ by 5½ inches. Different stock changes the back width and front opening; confirm actual dimensions and cut the front boards last.
Steps
Cut and smooth the fixed parts
Cut the posts, side slats and back slats from the list. Sand handling edges. Predrill two screw holes at each slat end, positioned to enter the posts rather than the board edges.
Build two matching sides
Lay two posts parallel with their outside edges 36 inches apart. Screw six 36-inch slats across them, flush with the outside post edges. Start ½ inch above the post bottoms and leave ½-inch gaps. Use two 2-inch screws at each end. Repeat for the other side.
Join the sides with the back
Stand the sides with 36 inches between their outer post faces. The side slats add ¾ inch at each outside edge, making the back 37½ inches wide. Fasten the six back boards across the rear posts, matching the side heights. Square the footprint and check both diagonals.
Brace the fixed walls
Cut one 1×3 diagonal to fit across each side’s inside post faces. Predrill and secure each end to a post with two 2-inch screws. Recheck that the frame is square and does not rack; trim screw points or replace overlong screws.
Make the front channels
On each front post’s inward-facing side, fix two ¾-inch-square vertical strips, leaving a ⅞-inch slot between them front-to-back. The slots must face one another. Predrill and fasten strips into the posts with 1½-inch screws about every 8 inches; keep screws out of the slot.
Fit the removable slats
Measure between the opposing post faces and subtract ¼ inch; about 28¾ inches for this layout. Cut one front board and test that its ends stay captured in both channels while sliding freely. Cut five more to match. Stack them from the ground upward without fastening them.
Place, fill and verify
Set all four posts on firm level ground. Check every slat can lift out and the frame remains steady. Start with loose garden browns and greens, keeping the pile damp but not saturated. Do not compact it against the walls or fill above the posts.
Set all four posts on firm level ground. Check every slat can lift out and the frame remains steady. Start with loose garden browns and greens, keeping the pile damp but not saturated. Do not compact it against the walls or fill above the posts.
Tips
Cut the front last
Real assembly dimensions matter more than a nominal cut length.
Keep the gaps open
Do not line this ventilated bin with impermeable plastic.
Turn without levering
A garden fork should turn compost, not pry against a removable board.