What Size Coop Do You Need for 12 Chickens?
Everything below is sized for 12 standard breed hens kept in a coop with an attached run. The numbers come from the same math our sizing calculators use, so you can build to them and then check your own dimensions with the tools at the bottom of the page.
12 chickens need about 48 sq ft of coop floor and 120 sq ft of run (roughly 11 ft by 11 ft), with 3 nest boxes, 10 ft of roost bar, and around 4.9 sq ft of permanent ventilation up high. If the birds are confined all day, aim closer to 180 sq ft of run.
The numbers for 12 chickens
Coop footprints that work for 12 chickens
Any of these hit the 48 sq ft target. Build the bigger one if you think you might add birds, because almost nobody stops at their first flock size.
| Footprint | Floor area | Notes |
|---|---|---|
| 6 ft x 8 ft | 48 sq ft | Meets the target with a little walking room |
| 8 ft x 8 ft | 64 sq ft | Meets the target with a little walking room |
| 8 ft x 10 ft | 80 sq ft | Room to add birds later without rebuilding |
Space by breed size
Breed size changes the coop target more than most people expect. A flock of 12 Brahmas needs noticeably more floor than 12 Leghorns.
| Breed size | Coop for 12 birds | Examples |
|---|---|---|
| Bantam | 24 sq ft | Silkie, Sebright, bantam Cochin |
| Standard | 48 sq ft | Rhode Island Red, Australorp, Barred Rock |
| Heavy | 60 sq ft | Brahma, Jersey Giant, Orpington |
What 12 chickens cost to run
12 laying hens eat roughly 21 lb of layer feed a week, about 90 lb a month, which works out to around 1.8 fifty pound bags. Time on grass pulls that down, and a cold snap pushes it back up because the birds burn more calories staying warm.
Water use runs near 1.5 gallons a day in mild weather and can double in summer heat, so size the waterer for at least two days of supply. On the return side, expect 42 to 66 eggs a week in peak season, which is 15.1 to 23.7 dozen a month before winter and moult slow things down.
Mistakes people make at this flock size
The most common one is buying a prefab coop advertised for 12 chickens. Those ratings are usually based on birds standing still, not living there, and a coop sold for 12 birds often has closer to half the 48 sq ft you actually want. Measure the interior floor yourself before you believe the label.
The second is sealing the coop for winter. Ventilation is not the same as a draft: keep 4.9 sq ft of opening above roost height open all year so moisture and ammonia leave the building. Frostbite in a backyard coop is far more often a humidity problem than a cold problem.
The third is under building the run. 12 birds in 120 sq ft is workable if they get out to forage, but a permanently confined flock at that density turns the ground bare fast and picking starts. Hardware cloth, not chicken wire, on every opening, and bury or skirt it a foot out from the base.
Check your own dimensions
FAQ
How big should a coop be for 12 chickens?
Plan on about 48 sq ft of enclosed coop floor for 12 standard sized hens, which is 4 sq ft each. Bantams can drop to roughly 24 sq ft total, and heavy breeds such as Orpingtons or Brahmas are more comfortable at 60 sq ft.
How big does the run need to be for 12 chickens?
A confined run should be at least 120 sq ft, about 11 ft by 11 ft. If the birds never free range, 180 sq ft keeps boredom, feather picking, and mud far more manageable.
How many nest boxes do 12 chickens need?
3 boxes at roughly 12 in square. Hens share boxes and usually crowd into one favourite anyway, so more boxes than that mostly become storage shelves.
How much roost space do 12 chickens need?
About 10 ft of roost bar total, based on 10 in per standard bird. Split it across two bars at the same height if a single run of bar will not fit.
How much feed do 12 chickens eat?
Roughly 21 lb per week, or 90 lb per month, which is about 1.8 fifty pound bags. Foraging time lowers it, cold weather raises it.
How many eggs will 12 hens lay?
In peak season expect about 42 to 66 eggs a week, or 15.1 to 23.7 dozen a month. Production drops in winter, during moult, and as hens pass three years old.