How to Build a Home Compost Bin

Composting is a simple, effective way to reduce household waste and create nutrient-rich soil for your garden—often without spending any money. With a few basic supplies and a little time, you can build a functional compost bin and start turning kitchen scraps and yard trimmings into valuable compost.

We made a simple homemade compost bin in about an hour using mostly items we already had. There are more elaborate options for composting, but a basic plastic bin works well to get started. Below are clear steps to assemble and maintain a small backyard compost system that stays tidy, smells fresh, and produces useful soil amendment for pots, garden beds, or lawn applications.

Steps For Making Your DIY Compost Bin

1. Find a plastic storage bin
2. Drill holes in the bin
3. Create a dry base of “browns”
4. Add soil
5. Toss in food scraps and other “greens”
6. Mix and moisten the pile
7. Locate the bin in a convenient, shady spot

Step 1: Select Your Bin

Choose a plastic storage container with a tight-fitting lid, ideally 24 inches tall or taller. A secure lid keeps moisture steady and prevents animals from accessing the contents. A 30‑gallon bin is a good size for most households; dark-colored containers can help retain heat for faster decomposition, while neutral tones are less visible in the yard.

Step 2: Drill Holes In Your Bin

Create airflow by drilling 8–10 small holes in the bottom of the container and 8–10 in the lid. Proper aeration is essential because the microbes that break down organic material need oxygen. Small holes—about 3/16″ or similar—work well to encourage circulation while keeping material contained.

Step 3: Create Your Brown Base

Compost works best when you alternate dry “browns” and moist “greens.” Start by adding a layer of dry leaves, shredded paper, or small twigs to fill the bottom of the bin about 1/8 to 1/4 full. This brown base helps absorb moisture, adds carbon, and improves aeration at the bottom of the pile.

Step 4: Add Soil

Add a layer of soil or finished compost on top of the brown layer until the container is roughly half full. Soil inoculates the pile with beneficial microbes and helps speed up decomposition. Use topsoil from your yard if available, or a small bag of basic garden soil if necessary. Worms in the soil can help, but they are not required to get started.

Step 5: Toss In Your Food Scraps

Now add your “greens” — kitchen scraps and other nitrogen-rich materials. Good items to compost include:

• Fruit and vegetable scraps
• Coffee grounds, filters, and tea bags
• Eggshells and clean nutshells
• Paper and cardboard (shredded)
• Yard trimmings and grass clippings

Avoid adding dairy, fatty foods, cooked meats, and pet waste, as these items can attract pests and create odors. Cover fresh food scraps with a layer of soil or browns to minimize smells and speed the breakdown process.

Step 6: Stir Your Compost

Occasionally turn or stir the contents with a shovel or stick to reintroduce oxygen and distribute moisture and heat evenly. You don’t need to overdo it—turning the pile every few weeks is usually enough for a small bin. Make sure food scraps are covered so they stay out of reach of animals and don’t create odors.

Step 7: Moisten

Keep the pile damp but not waterlogged—about the consistency of a wrung-out sponge. Lightly spray or add small amounts of water if the contents dry out, especially during hot, dry weather. Too much water can make the pile anaerobic and smelly, so balance moisture with dry browns as needed.

Step 8: Find A Convenient Spot

Place the bin in a shaded, well-drained spot away from direct sun and not right up against the house. A location near your kitchen or back door makes it easy to empty a countertop container into the outdoor bin. If you live in an apartment, a small bin can sit on a balcony or patio as long as it stays shaded and ventilated.

Step 9: Collect Compostable Materials Indoors

Keep a small, airtight container under the sink or on the counter to collect kitchen scraps between trips to the outdoor bin. A sealed container prevents odors and makes it easy to transfer materials to the compost without sorting through the trash.

When Is Your Compost Ready?

Decomposition time varies depending on bin size, materials, and how often you turn the pile. Finished compost can be ready in a few months or may take up to a year. Look for these signs that compost is mature and usable:

• No recognizable food pieces remain
• An earthy, soil-like smell (not sour or rotten)
• No excess heat—temperature close to ambient air
• Dark, crumbly texture rather than wet clumps

When ready, use your compost as mulch, a soil amendment, or mixed into potting mixes and garden beds. Keep a portion of finished compost to seed new batches, and consider using multiple bins so you can add fresh material to one while the other finishes breaking down.

This low-cost method is an easy way to lower household waste and produce garden-friendly compost. With minimal effort and inexpensive supplies, you can start a practical composting routine that benefits both your yard and the environment.

**This post was originally published on August 21, 2008**