A common guideline is about 3 to 4 square feet of coop floor per standard-size chicken and about 8 to 10 square feet of run per bird, with roughly half that for bantams. Allow 8 to 10 inches of roost per bird, one nest box for every 4 to 5 hens, and ventilation high in the walls above the roosts. Many prefab coops overstate capacity, so size by floor area, not the label.
Crowding causes pecking, disease and dirty eggs. Size the coop and run before you buy birds.
Space per bird
| Standard breeds | Bantams | |
|---|---|---|
| Coop floor | 3 to 4 sq ft | About 2 sq ft |
| Run | 8 to 10 sq ft | 4 to 5 sq ft |
| Roost length | 8 to 10 in | 5 to 6 in |
| Nest boxes | 1 per 4 to 5 hens | 1 per 4 to 5 hens |
These are common extension-service style guidelines. Larger breeds and colder climates, where birds spend more time inside, need more.
Sizing table (standard hens)
| Flock | Coop floor | Run |
|---|---|---|
| 4 hens | 12 to 16 sq ft | 32 to 40 sq ft |
| 6 hens | 18 to 24 sq ft | 48 to 60 sq ft |
| 10 hens | 30 to 40 sq ft | 80 to 100 sq ft |
| 20 hens | 60 to 80 sq ft | 160 to 200 sq ft |
Ventilation and light
Put vents high on the walls, above roost level, and cover them with hardware cloth. Windows add light, which affects laying.
Predator-proofing
- Hardware cloth (not chicken wire) on windows, vents and run walls.
- Bury an apron of wire 12 inches out from the run base, or dig it in.
- Latches that raccoons cannot open.
- An automatic coop door closes at dusk if you are late.
Cleaning access
Walk-in coops and large doors make cleaning easier. Droppings boards under roosts save bedding.
Next steps: feeders and waterers, and plan the rest of the homestead with fencing, preserving garden produce and, for pollination and honey, beekeeping equipment.
Browse chickens and poultry.
Common questions
How many chickens fit in a 4x8 coop?
A 32 square foot coop holds about 8 to 10 standard hens at 3 to 4 square feet each, with a run of at least 64 to 80 square feet.
How many nest boxes do I need?
About one for every 4 to 5 hens. Hens share boxes, so more is rarely needed.
Do chickens need ventilation in winter?
Yes. Moisture from breathing and droppings causes frostbite and respiratory problems. Vent high above the roosts so air moves without drafts on the birds.
Why do coop labels say they hold more birds?
Many prefab coops quote capacity for bantams or for birds that free-range all day. Size by floor area for your breed.