Food waste makes up roughly 30% of what the average household sends to landfill. In a landfill, that food waste decomposes without oxygen, producing methane — a greenhouse gas many times more potent than carbon dioxide in the short term. The same banana peel, coffee grounds, and vegetable scraps, when composted, become nutrient-rich soil that can feed plants on your balcony, in your community garden, or in a friend’s backyard.
For years, composting was treated as a privilege of those with yards and gardens. That’s no longer true. Modern composting systems make it entirely feasible to compost in an apartment — without smell, without pests, and without taking up significant space. Here’s everything you need to know to start composting indoors.
Why Compost in an Apartment?
Before getting into the how, let’s address the reasonable question: why bother? You don’t have a garden. You may not even have houseplants. Why separate your food scraps?
Environmental impact: Food waste in landfills is a significant source of methane. Composting your scraps — even if you give the resulting compost away — breaks this cycle. The same organic matter that produces methane in a landfill produces carbon dioxide in a compost bin (aerobic decomposition), and CO2 is a far less potent greenhouse gas.
It reduces your trash: Separating food scraps typically reduces household trash volume by 25-35%. For apartments with limited bin space, this is a practical benefit.
It produces something valuable: Finished compost is genuinely useful — for your houseplants, your balcony garden, the street tree outside your building, or a community garden. Even if you don’t use it yourself, someone in your neighborhood will want it.
It connects you to a natural cycle: In an increasingly digital and indoor life, participating in the literal cycle of decay and renewal is grounding in a way that’s hard to describe until you experience it.
The Three Apartment Composting Methods
Method 1: Vermicomposting (Worm Bin)
What it is: A bin containing special composting worms (Eisenia fetida, or red wigglers — not the earthworms in your garden) that eat your food scraps and produce castings (worm manure), which is arguably the best plant fertilizer in existence. The worms process roughly their own body weight in food scraps per day.
Space required: About the footprint of a kitchen trash can. A worm bin can live under the kitchen sink, in a closet, on a balcony, or in a utility room. It needs to stay between 15-27°C (60-80°F) — indoor temperatures are ideal.
What you can compost: Most fruit and vegetable scraps, coffee grounds and filters, tea bags (remove staples), crushed eggshells, bread, pasta, and grains. Avoid citrus in large quantities (too acidic), onions and garlic (worms don’t love them), meat and dairy (they attract pests and smell), and oily foods.
What you can’t compost: Meat, fish, dairy, oily foods, pet waste, and anything treated with pesticides.
Odor: A properly maintained worm bin has almost no smell — a faint earthy scent, like a forest floor after rain. If it smells bad, something is wrong (usually too much food, too wet, or not enough air).
Setup and maintenance:
- Start with a bin (commercial stacking systems like the Worm Factory 360 cost $70-120; you can also DIY with two nesting plastic bins with holes drilled in the top one).
- Add bedding: shredded newspaper, cardboard, or coconut coir, moistened to the consistency of a wrung-out sponge.
- Add worms (available online — start with about 500g/1 lb of red wigglers for a typical household of 1-2 people).
- Bury food scraps under the bedding each time you add them. This is the key step that prevents odor and fruit flies.
- Harvest castings every 2-3 months. The simplest method: push everything to one side of the bin, add fresh bedding and food to the empty side, and wait a few weeks. The worms will migrate to the new food, leaving the finished castings behind.
Time to finished compost: 2-3 months. Output: Rich worm castings — the best plant food you can produce. Even a small bin produces enough castings to fertilize a robust collection of houseplants or a balcony garden.
Method 2: Bokashi (Anaerobic Fermentation)
What it is: A Japanese method that uses beneficial microorganisms (inoculated bran) to ferment food waste in an airtight container. Unlike traditional composting, bokashi is anaerobic (without oxygen) and can handle all food waste — including meat, dairy, and cooked foods. The process pickles the waste rather than decomposing it, which is why it doesn’t smell like rot.
Space required: A bokashi bin is about the size of a kitchen bin. It lives in the kitchen, ideally under the sink or in a corner. Two bins are recommended — one that you’re actively filling and one that’s fermenting.
What you can compost: Everything. Meat, fish, dairy, cooked food, bones (small ones, cut up), citrus, onions — all the things that traditional composting and worm bins can’t handle. This is bokashi’s primary advantage.
What you can’t compost: Large bones, excessive liquid (drain soups before adding), already-rotting food (it’s already decomposing via different microorganisms and can disrupt the fermentation).
Setup and maintenance:
- Get a bokashi bin (a bucket with an airtight lid and a spigot at the bottom — commercial systems cost $50-80).
- Add food scraps in layers, sprinkling bokashi bran between each layer.
- Press down firmly after each addition to remove air pockets.
- Close the lid tightly after each addition. The bin must remain sealed.
- Drain the liquid (bokashi “tea”) every few days via the spigot. This liquid is an excellent drain cleaner or, diluted 1:100 with water, a powerful plant fertilizer.
- When the bin is full, let it sit sealed for 2 weeks to complete fermentation. During this time, you’ll need a second bin for new scraps.
Time to finished product: 4-6 weeks (2-4 weeks to fill the bin, plus 2 weeks fermentation). However, the fermented output (pre-compost) still needs to be buried in soil or added to a traditional compost pile to finish breaking down. In an apartment, you can bury it in a large planter, a community garden, or give it to a friend with a yard. Some cities also have compost drop-off programs.
Key difference from other methods: Bokashi doesn’t produce finished compost on its own — it produces fermented pre-compost that must be buried in soil to finish decomposing. This is the method’s main limitation for apartment dwellers without access to soil. However, if you have a balcony with large planters, or a community garden nearby, bokashi is manageable.
Method 3: Electric Composters (Food Recyclers)
What it is: A countertop appliance (about the size of a bread maker) that dehydrates and grinds food waste into a fine, dry powder over several hours. Despite the name, electric composters don’t actually compost — they dehydrate. The output is a dry, odorless powder that can be mixed into soil where it will finish decomposing. Brands include Lomi, FoodCycler, and Tero.
Space required: Countertop appliance, about 30 x 30cm footprint. Requires access to an electrical outlet.
What you can compost: Most food scraps including small amounts of meat and dairy (check your specific model — capabilities vary). Some models can also process compostable bioplastics.
Pros: Extremely convenient — just add scraps, press a button, and you have dehydrated food “compost” in 4-8 hours. No worms, no fermentation time, no soil burial step. The output is significantly reduced in volume (up to 90%) and is dry and odorless.
Cons: High upfront cost ($300-500). Uses electricity (though not a lot — roughly $2-5 per month in electricity costs). The output is not finished compost — it’s dehydrated food waste that needs soil contact to fully decompose. Also, you’re essentially dehydrating food scraps, which is a very different process from biological composting and has a different environmental calculus.
Best for: People who want the absolute easiest method and are willing to pay for convenience, or who have no access to outdoor space and no interest in managing a living system (worms or microorganisms).
Common Problems and Solutions
Fruit flies (worm bin): Fruit flies mean food is exposed. Always bury food scraps under the bedding. If flies appear, add a layer of dry bedding on top, reduce feeding for a week, and consider adding a fruit fly trap (a small jar of apple cider vinegar with a drop of dish soap) near the bin.
Bad smell (worm bin): Usually too wet or too much food. Add dry bedding (shredded cardboard or newspaper), stop feeding for a week, and make sure the bin has adequate drainage and ventilation.
Mold (bokashi): White mold on top of the food waste is normal and a sign of healthy fermentation. Green or black mold means something went wrong — usually the lid wasn’t sealed properly or too much air got in. If this happens, add extra bokashi bran and ensure the lid is sealing correctly.
Worms dying (worm bin): Usually temperature or moisture. Worms need 15-27°C (60-80°F) and bedding that feels like a wrung-out sponge. If it’s too dry, mist with water. If it’s too wet, add dry bedding. If the temperature is wrong, move the bin.
Slow decomposition (all methods): In a worm bin, you may be adding too much food for the worm population; reduce feeding or add more worms. In bokashi, the bin may be too cold; move it to a warmer spot.
Which Method Should You Choose?
| Factor | Worm Bin | Bokashi | Electric |
|---|---|---|---|
| Upfront cost | $50-120 | $50-80 | $300-500 |
| Ongoing cost | Negligible | Bran refills: ~$10/month | Electricity: ~$3/month |
| Maintenance time | 5 min/week | 5 min/week | 1 min/day (to load and run) |
| All food waste? | No (no meat/dairy) | Yes — everything | Most (check model) |
| Finished output | Worm castings (2-3 months) | Fermented pre-compost (4-6 weeks, needs soil burial) | Dehydrated powder (hours, needs soil) |
| Best for | Plant owners, patient people | Cooks and omnivores with access to soil | Convenience-seekers with budget |
| Living component | Yes (worms) | Yes (microorganisms) | No |
Our recommendation for most apartment dwellers: Start with a worm bin. It’s the most affordable, produces the most valuable output (worm castings), and is a genuinely self-contained system. You don’t need to leave your apartment to complete the cycle. If you have access to a community garden, balcony planter, or friend’s yard, bokashi is an excellent complement for the food scraps that worms can’t eat.
Composting in an apartment is profoundly satisfying — the daily ritual of feeding your worms or filling your bokashi bin connects you to a natural cycle that modern urban life has largely hidden from view. It takes a few weeks to establish the habit, after which it becomes as automatic as taking out the trash. The difference is that instead of sending your food scraps to a landfill to produce methane, you’re turning them into soil. In an apartment. With no smell. It genuinely works.