Deep Litter System for Chickens: Cleaner Coops with Less Work

Most chicken keepers start out thinking they need to regularly clean out their coop to keep it healthy. That can be really off-putting to people who are considering keeping chickens for the first time, because it sounds like a lot of work for a small flock. Great, do it if you have the time… but I ain’t got time for that.
It makes sense on the surface. Remove waste, keep things clean. But there’s another approach that, when done properly, is often cleaner, lower maintenance, and far more useful in the long run.
What is it? It’s called a deep litter system.

What is a deep litter system?

Instead of constantly removing bedding, a deep litter system is a method where bedding material is built up over time rather than removed frequently. You begin with a thick base layer of dry, carbon-rich material such as leaves, pine shavings, hemp bedding, or a mix of these, and continue adding fresh material as manure is deposited.

Over time, the lower layers begin to break down into what is best described as dry compost, while the top layer remains relatively dry and usable. Rather than being waste, the bedding becomes a working layer where fresh material is added on top and the lower layers are broken down by microbes and beneficial bacteria underneath.

But, doesn’t it smell?

It’s a fair question. Leaving manure in the coop sounds like it should create strong ammonia levels, but when it’s done properly, it doesn’t.

That familiar “chicken coop smell” comes from ammonia being released as manure breaks down when it sits exposed. In a deep litter system, manure is quickly covered and absorbed into carbon-rich bedding, which limits that ammonia from building up in the air.

This matters more than most people realise. Chickens are far more sensitive to ammonia than we are. Humans generally don’t detect it until levels reach around 20 to 25 parts per million. Chickens begin to experience irritation at much lower levels, from around 10 parts per million.

So by the time you can smell it, your chickens have already been breathing it in for a while. They are also closer to the litter and have higher respiration rates, which means ammonia affects them earlier and more severely. Even levels that seem mild to humans can impact their respiratory system, eye health, and overall immunity.

A deep litter system works by reducing ammonia at the source. If you can smell it, something is out of balance—usually too much moisture or not enough dry bedding.

So what is actually happening in the litter?

Under the surface, the bedding and manure are slowly breaking down into what can be described as dry compost. This is different to the wet compost people are familiar with in a compost bin. It’s a slower process that works with lower moisture and happens directly in place. Dry compost doesn’t mean completely dry—just not wet or soggy.

Chickens do most of the work. Their scratching mixes the material and helps prevent compaction, allowing the lower layers to continue breaking down while the surface remains usable.

If the litter isn’t being turned over enough, a quick pass with a shovel is all that’s needed. It doesn’t require a routine, just a quick fix when it looks like it needs it.

As the system builds, the lower layers become darker and more crumbly, while the top continues acting as bedding.

If you’re not cleaning it out, what are you actually doing?

You’re adding to it rather than removing it.

As manure builds up, fresh bedding is added over the top to keep the surface dry and prevent waste from sitting exposed. The chickens handle most of the mixing through their normal behaviour.

Shredded paper can also be used as part of the bedding mix. It works best when combined with materials like leaves or shavings. On its own it can flatten and hold moisture, so it’s better used as part of a mix. Stick to plain paper and avoid glossy or heavily inked material.

How often do you clean it out?

Even though the system runs continuously, it still needs a reset.

For most backyard setups, once or twice a year is enough. I tend to do it twice a year, which lines up well with seasonal changes.

Cleaning out in autumn prepares the coop for cooler weather, when chickens are more likely to spend time inside. Starting fresh at this point helps keep things dry and keeps ammonia levels lower when the coop is being used more.

Cleaning out again in spring gives them a clean space going into warmer weather, when they’ll be using the coop for shade and shelter. It also prevents the litter from becoming too dense or holding excess moisture as temperatures rise.

In Australia, timing it with the seasons works well.

When you do clean it out, it’s worth leaving a small amount behind. I usually keep a bucket aside and spread it back over the fresh bedding. That material contains the microbes and beneficial bacteria that help kick-start the process again.

What are the signs it’s not working properly?

A deep litter system is generally stable, but it will show clear signs when something isn’t right.

A noticeable ammonia smell means the manure isn’t being absorbed quickly enough and more dry bedding is needed.

Litter that feels wet or heavy usually points to excess moisture, whether from spills, rain, or poor airflow. It should feel dry or only slightly damp, not wet or clumping together.

If manure is sitting on the surface instead of being covered, the top layer needs refreshing.

Final thoughts

A deep litter system isn’t about avoiding work. It’s about using a method that works with how chickens behave and how organic material naturally breaks down.

When it’s set up properly, it stays dry, doesn’t smell, and takes far less effort to maintain. When something is off, the signs are usually easy to spot and fix.

Keep the bedding dry, keep adding fresh material, make sure there’s airflow, and let the chickens do what they naturally do.