Large chicken coop for 20 chickens
I’m a US farmer who has raised laying hens for decades. If you want a large chicken coop for 20 chickens that keeps them safe, dry, and laying strong, let me walk you through what really matters out in the yard, not just on the product tag.
- How much room 20 hens really need
- Roosts, nests, and run layout that work
- Predator-safe doors, wire, and locks
- Ventilation that keeps combs frost-free
- Small tricks for calmer, happier hens
If you’re already thinking, “I just want a solid large chicken coop for 20 chickens that my hens will love,” you can scroll through different options and designs in one place.
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When folks ask me about a large chicken coop for 20 chickens, they usually expect a simple size number. I smile, scratch my beard, and tell them the same thing my granddad told me: “Chickens don’t read blueprints, they read comfort.” Space matters, but how that space is set up matters even more.
I’ve tried little coops, big barns, and just about everything in between. I’ve chased hens in the rain, shoveled frozen bedding at 5 a.m., and learned the hard way what works and what just looks pretty in a picture. Let me share the details I wish someone had told me before I ever built my first big coop for a full flock of layers.
How big should a large chicken coop for 20 chickens be?
Let’s start with the numbers, then I’ll tell you what I actually see on the farm. Most books will tell you 3–4 square feet per bird inside the coop if they have a run. For 20 hens, that’s 60 to 80 square feet inside.
That’s the minimum. My hens are spoiled, so I aim higher. When I crammed 20 birds into a 64-square-foot coop, they got a bit testy with each other on bad-weather days. Feather picking, extra noise, and the boss hen turning into a tiny feathery sheriff.
Around 100 square feet inside feels just right for 20 chickens in my weather. That might be something like 10 × 10 feet. If the coop is raised and they can hang under it, that bonus shade helps too.
Indoor and outdoor space that really works
Inside the coop, I like:
- 3–5 square feet per hen inside, more if winters are long
- 8–10 inches of roost space per hen (I give closer to 10)
- At least 1 square foot of vent opening for every 10 square feet of floor
Outside in the run, don’t be shy about space. Four square feet per hen is often quoted, but my birds are calmer with 8–10 square feet per hen in the run, especially when the ground’s muddy and they’re pacing around like teenagers with nothing to do.
Simple size guidelines for 20 hens
- Coop interior: 80–120 sq ft
- Run: 160–200 sq ft or more
- Roost bar length: 16–20 feet total
- Nest boxes: 5–7 boxes
When in doubt, go a bit bigger. I’ve never heard a hen complain about too much elbow room.
Layout: roosts, nests, and where the poop really lands
A coop can have plenty of square footage and still feel tight if the layout is wrong. Chickens have their own traffic patterns. If you put the roosts, nests, and feeders in the right spots, they’ll flow like a gentle stream instead of a feathery traffic jam.
Roosts for 20 hens
Hens like to sleep up off the ground. For 20 chickens, I aim for two or three roost bars around 6–8 feet each. I keep them at the same height so my lower-ranking hens don’t get bullied off the “good seats.”
- Use 2×3 or 2×4 boards with the wide side up so their feet stay warm.
- Set roosts higher than the nest boxes so they don’t sleep in the boxes.
- Leave at least 12–14 inches of space between parallel roosts.
First time I packed too many birds on one high roost, I learned that when one jumps, they all jump. Looked like feathery popcorn. Spacing the bars better fixed that.
Nest boxes that stay clean
For a large chicken coop for 20 chickens, you don’t need 20 nest boxes. Hens like to share. I’ve watched six hens line up to use the same box while three others sit empty, like some kind of poultry superstition.
- 5–7 nest boxes is plenty for 20 hens.
- Size around 12×12×12 inches, with a small lip to hold bedding.
- Place nests lower than roosts and out of direct sun.
- Keep food and water away from the nest wall to reduce mess.
Where to put feeders and waterers
I like my feeders inside, close to the door so I’m not marching through the whole coop in muddy boots. Water can be inside, outside, or both, but for 20 hens I prefer:
- One main feeder inside, hung at the height of their backs.
- One waterer inside for winter, one outside for summer.
- Walkways wide enough so lower hens can pass without getting pecked.
Predator protection for a big flock
A large chicken coop for 20 chickens is like a dinner bell for every hungry critter around: raccoons, foxes, dogs, hawks, even the neighbor’s cat if it’s feeling bold. I’ve lost birds before, and it doesn’t feel good. These days I build with predators in mind first, looks second.
Wire, doors, and locks
Skip the cheap thin wire if you can. For 20 birds, it’s worth doing it right:
- ½-inch hardware cloth for runs and openings, not chicken wire.
- Solid latches that raccoons can’t flip open easily.
- Doors that close tight with no gaps at the corners.
- Buried wire or an apron around the run to stop diggers.
One summer I woke up to feathers all over the yard because a cheap latch twisted just enough for a raccoon to slip a paw through. I fixed that the same day with double latches and haven’t had that trouble since.
Predator-safe checklist
- No gaps bigger than your thumb
- Hardware cloth, not just chicken wire
- Secure night-time door on coop
- Dig-proof perimeter or apron
- Sturdy roof, not just tarp
Walk around the coop at night with a flashlight. If you see a gap, assume some critter already found it.
Ventilation, climate, and keeping combs from freezing
Chickens can handle more cold than most folks think, but they hate damp and drafts. A large chicken coop for 20 chickens builds up moisture fast just from their breathing and droppings. If that moisture can escape, you’re in good shape.
Good air without cold drafts
I aim for high vents and low calm air. That means openings up near the roofline, with solid walls or curtains down by the roosts so the birds don’t sit in a breeze.
- Long, narrow vents along the top of the wall.
- Windows you can close on the windward side in winter.
- No big openings at roost height in cold climates.
Once I sealed a coop too tight trying to keep birds warm. Within a week, the smell told me I’d made a mistake. Opened up some vents near the roof and the air cleared, but the temperature stayed just fine.
Summer shade and winter windbreaks
A big flock puts out a lot of body heat in winter and a lot of dust in summer. I like coops that:
- Face the open side toward winter sun and away from prevailing winds.
- Have a solid roof for shade and dry ground.
- Offer a covered corner in the run for heavy rain or snow.
My hens handle cold down to single digits as long as they’re dry and out of the wind. Wet feathers and a draft will freeze combs faster than the thermometer will.
Daily life with a large chicken coop for 20 chickens
Let’s talk about your back, your boots, and your time. It’s easy to get romantic about chickens, but you’ll be the one hauling feed and shoveling bedding. When I choose a big coop, I picture myself in January, before sunrise, with a headlamp and a stiff breeze.
Doors, height, and cleaning
For 20 hens, I strongly prefer a coop I can walk into. I did the crawling-coop thing when I was younger. My knees still remember.
- Full-height door if possible.
- Wide enough entry for a wheelbarrow or at least a big tub.
- Removable roosts or dropping boards for easier clean-outs.
I’m a big fan of deep litter in a larger coop. Add dry shavings, leaves, or straw regularly, and turn it now and then. Done right, it stays surprisingly sweet and turns into great garden compost.
Farmer comfort tags
Easy to clean Walk-in height Simple latches Dry entrywayIf a coop looks like a pain to clean when it’s brand new, it won’t magically get better once it’s full of bedding and droppings.
Keeping 20 hens calm and productive
A big flock has a pecking order. Give them enough space and something to do, and they settle down. Pack them too tight, and you’ll hear about it. Literally.
- Hang a cabbage or treat block now and then to give them something to work on.
- Provide perches and stumps in the run so low-ranked birds can get out of the traffic.
- Keep feed and water in more than one spot if bullying is a problem.
My flock got a whole lot quieter once I started giving them a little “project” in the run each day—scratching through a pile of leaves, chasing a tossed handful of scratch, that sort of thing. Busy hens are peaceful hens.
What to look for when choosing a large chicken coop for 20 chickens online
Pictures can be tricky. I’ve seen “coops for 10–15 chickens” that I wouldn’t put more than 6 hens in. So when you’re scrolling around looking for a large chicken coop for 20 chickens, don’t just read the headline. Read the measurements and think like a chicken and a tired farmer at the same time.
Reading between the lines
- Check floor dimensions, not just “holds up to X chickens.”
- Look for real photos with birds, not just drawings.
- See if the run is included in the listed size or not.
- Check door height and width if you want walk-in access.
I like coops that show the inside clearly—where the roosts are, how the nests are arranged, and how the doors open. If the listing hides the inside, I raise an eyebrow.
Online coop red flags
- Very light weight for a big footprint
- Vague capacity claims without square footage
- No close-up photos of wire and latches
- Only one small door for a large run
A solid large chicken coop for 20 chickens should look like it can handle a good wind and a curious raccoon, not just a mild afternoon.
If you’re thinking, “I just want to see a bunch of solid options and pick what feels right,” you can browse different styles, sizes, and layouts made for bigger flocks like yours.
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Bringing it all together
A good large chicken coop for 20 chickens is more than a box with a roof. It’s a place where your birds can scratch, sleep, and lay without fuss, and where you can walk in, do your chores, and walk out without needing a nap afterward.
If you remember nothing else, remember this: size, safety, airflow, and easy chores. Get those four right and your hens will do the rest. They’ll still squabble a bit, they’re chickens after all, but they’ll be healthy, laying strong, and waiting at the door each morning like they’re glad to see you.
If you’re ready to look over different designs and think, “Which one would my hens feel at home in?”, you can explore a wide range of large coops and see what fits your yard and your flock.
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