What a coop has to do
A coop is a night shelter and a safe place to lay eggs. A good one keeps chickens dry, protected from predators, comfortably cool or warm for your climate, and easy for you to clean. A fancy design matters less than getting these basics right.
Space
Rules of thumb vary by source and by breed size, but many keepers allow roughly 3 to 4 square feet per standard-size hen inside the coop and around 10 square feet per bird in an attached run. Large breeds, such as Brahmas, and flocks that spend a lot of time confined in winter generally need more. Crowding is linked to stress, bullying, and dirtier bedding. If in doubt, go larger, since flocks tend to grow. Check any local rules too, because some areas specify minimum space or distance from property lines.
Try to build tall enough, or with big enough doors, that you can reach every corner for cleaning.
Predator-proofing
Security is usually the most important part. Predators vary by region and may include raccoons, foxes, coyotes, dogs, hawks, owls, weasels, snakes, and rodents.
- Use hardware cloth, not chicken wire. Chicken wire keeps chickens in but does not reliably keep predators out. Welded hardware cloth with about 1/2 inch openings is commonly recommended for windows, vents, and any openings.
- Stop diggers. Bury mesh or lay a wire apron extending outward from the base of the run.
- Secure latches. Raccoons are skilled with their hands, so use two-step latches.
- Cover the run. A roof or netting helps against hawks and climbers.
- Close up at dusk. Even a strong coop only helps if the door is shut at night.
Ventilation without drafts
Chickens produce moisture and ammonia from droppings, and poor ventilation can contribute to respiratory trouble and frostbite in cold weather. Vents high on the walls near the roofline let damp, warm air escape. Try to avoid direct drafts blowing across the roosting birds. In cold weather, ventilate rather than sealing the coop airtight. If birds develop persistent breathing problems, sneezing, or nasal discharge, see a vet.
Roosts and nest boxes
- Roosts. Chickens prefer to sleep off the ground. A flat or slightly rounded bar, such as a 2x4 with the wide side up, lets them cover their feet in cold weather. Many keepers allow roughly 8 to 12 inches of roost space per bird.
- Nest boxes. A common guideline is one box for every 3 to 4 hens. Place boxes lower than the roosts so birds are less likely to sleep in them, and keep them dark and quiet.
Flooring, bedding, and cleaning
A dry, solid floor is easier to keep clean and harder for predators to get through. Bedding such as pine shavings or straw absorbs moisture. A droppings board under the roosts makes daily cleaning quick. Remove wet and soiled material regularly to cut odor and flies. Regular cleaning also helps limit parasites such as mites. If your birds seem itchy or you find mites, ask a vet or extension service about treatment.
Feeders and waterers
Keep feeders and waterers clean and, where possible, hung or raised to reduce contamination. Keep feed dry and stored in a lidded container to discourage rodents. For options, see types of chicken feed.
Climate
In hot climates, provide shade, airflow, and cool water. In cold climates, focus on dry bedding, draft-free roosting, and enough ventilation. Many cold-hardy breeds do fine without added heat. Heat lamps carry a fire risk, so many experienced keepers avoid them unless there is a clear need.
Common mistakes
- Using chicken wire for security.
- Too little space, especially in the run.
- Poor ventilation or the opposite, a drafty coop.
- Nest boxes higher than roosts.
- Doors that are hard to reach or clean.
- Forgetting digging predators.
- Not closing the coop door every night.
- Building too small for a flock that may grow.
Frequently asked questions
What is the number one predator of chickens?
It depends on where you live. Raccoons, foxes, dogs, hawks, and opossums are frequently named, but the main threat in your area may differ. Ask local keepers or your extension office.
What is the “90/10 rule” for chicken?
The phrase is used in different ways. In a feeding context, it often means about 90 percent complete feed and no more than about 10 percent treats. See types of chicken feed. It is not a rule about coop design.
How do I build the best chicken coop?
Start from the basics above, match the size to the number of birds you keep, and keep the flock in mind when deciding on layout. Before moving birds in, read about introducing chickens to a new home. If you are still choosing birds, see the best beginner chickens.