Apartment Composting: Three Methods That Work in Small Spaces

The first time I tried composting in a London flat, my partner found me hunched over the kitchen bin with a butter knife, scraping yesterday’s porridge into a jar. The jar had no lid, the jar had been a candle, and the smell was a clue that I had not, in fact, started composting. I had started rotting. Eight years later I run three different small-space systems in rotation, and almost nobody who comes round can tell.

If you live in a flat and want to keep food scraps out of the rubbish bin, your real question is rarely “which method is best”. Cornell Waste Management Institute It is “which method will I actually keep going”. The good ones are the ones that survive a busy week. Below are three I trust, with the trade-offs honest enough that you can pick by temperament rather than enthusiasm.

Bokashi: the one for kitchens that smell of nothing

Bokashi is technically fermentation rather than composting, but it is the method I recommend most often to first-timers in flats. You put a sealed bucket under the sink, layer in scraps with a sprinkle of bran soaked in beneficial microbes, press it down, close the lid. Two weeks later you have a pickled, faintly vinegary mass that is no longer food but not yet soil.

The reason I like it: a properly working bokashi bucket smells, when opened, a bit like cider going slightly wrong. Closed, nothing. It accepts cooked food, small bones, dairy, citrus peel, all the things a worm bin will refuse. The fermented contents need to go somewhere afterwards to finish breaking down. If you have a friend with a garden, a community plot, or a kerbside food caddy, problem solved. If not, the council food waste collection accepts it, which is more than they will say for raw scraps in a bucket of maggots.

The downside is the bran, which costs a few pounds a month. The drain-off “tea” that collects in the base, often praised as a houseplant tonic, is in my experience too strong and too fishy for most people’s living rooms. I pour it down the sink, which is what it was made for; it clears the drains beautifully.

Worm bins: quiet, slow, slightly dependent

A small wormery on a balcony or in a utility cupboard turns peelings into the loveliest dark crumbly compost you have ever held. The worms themselves are tidy creatures and need almost nothing from you: shredded paper, a steady trickle of fruit and veg, somewhere between cool and not-quite-cold.

What people underestimate is how little a wormery can actually eat. A healthy bin with a thousand worms will manage roughly half a kilo of scraps a day at full pelt, often far less. For a single person it is more than enough. For a family of four who chop a lot of vegetables, it will struggle, and a struggling worm bin starts to smell of overripe pear and produce small flies you will absolutely notice in a kitchen.

Electric countertop composters: useful but mostly misnamed

These are the kitchen gadgets that have appeared on every social feed in the last few years. The marketing calls them composters; they are really dehydrators with a grinder attached. You drop in scraps, press a button, and a few hours later get a dry, fluffy material that looks like ground coffee.

The output is not finished compost. Buried in soil, it continues to break down quickly and behaves like a soil amendment. Stored in a jar on a shelf, it sits there indefinitely. I have used one daily for two winters and I am, on balance, glad of it. It is silent enough to run overnight, it accepts almost any food, and it shrinks scraps by roughly eighty percent, which matters a lot when you do not have outdoor space to keep buckets.

The catches are honest ones. The machines cost a few hundred pounds. They use electricity, somewhere between a small dishwasher cycle’s worth per batch. The carbon filters need replacing every few months. If you treat one as the only answer it can feel extravagant; if you treat it as a stage one before donating the dried scraps to a community garden, it earns its place.

Choosing without overthinking it

The three systems suit different lives. I tend to suggest:

• Bokashi if you live alone or as a couple, cook a lot, and have somewhere to take the finished bucket every fortnight.
• A worm bin if you have a balcony, a patient streak, and produce modest amounts of plant-based scraps.
• An electric countertop unit if you live in a tiny space, share with people who hate any whiff of compost, and can justify the upfront cost.

Two of these can also be combined. A friend of mine in a Glasgow studio runs a bokashi bucket for cooked food and a small worm bin for peelings, and she has not put food in her rubbish bin in three years. The worms eat for free; the bran she buys in bulk twice a year.

The first month is the only hard one

Whichever method you choose, the first month feels fiddly. You forget to add bran, you overfeed the worms, the bucket sloshes. After four or five weeks the routine settles, and you stop thinking about it the same way you stopped thinking about loading the dishwasher.

The recurring mistake I see in flat-dwellers is treating composting as a project rather than a habit. A project demands attention, results, evidence of progress. A habit just happens. The systems above are all habits, once you settle into them. The worms eat. The bran goes on. The button gets pressed before bed. None of it deserves the mental space we give it at the start.

The flat I started in is long gone, the candle-jar is in landfill, and the porridge, eventually, became a tomato. Small spaces are not the obstacle they are made out to be. They are mostly a question of choosing well and keeping the lid on.

You might also want our notes on Worm Bins for Beginners: A Quiet Guide, What Can and Can’t Go in a Backyard Compost, Hot vs. Cold Composting: Which One Should You Choose?, and A Quiet Kitchen Reset: One Drawer, One Shelf, One Habit.