What Size Coop Do You Need for 15 Chickens?
Everything below is sized for 15 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.
15 chickens need about 60 sq ft of coop floor and 150 sq ft of run (roughly 13 ft by 13 ft), with 4 nest boxes, 12.5 ft of roost bar, and around 6.4 sq ft of permanent ventilation up high. If the birds are confined all day, aim closer to 225 sq ft of run.
The numbers for 15 chickens
Coop footprints that work for 15 chickens
Any of these hit the 60 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 |
|---|---|---|
| 8 ft x 8 ft | 64 sq ft | Meets the target with a little walking room |
| 8 ft x 10 ft | 80 sq ft | Meets the target with a little walking room |
| 8 ft x 12 ft | 96 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 15 Brahmas needs noticeably more floor than 15 Leghorns.
| Breed size | Coop for 15 birds | Examples |
|---|---|---|
| Bantam | 30 sq ft | Silkie, Sebright, bantam Cochin |
| Standard | 60 sq ft | Rhode Island Red, Australorp, Barred Rock |
| Heavy | 75 sq ft | Brahma, Jersey Giant, Orpington |
What 15 chickens cost to run
15 laying hens eat roughly 26.3 lb of layer feed a week, about 112.5 lb a month, which works out to around 2.3 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 1.9 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 53 to 83 eggs a week in peak season, which is 18.8 to 29.6 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 15 chickens. Those ratings are usually based on birds standing still, not living there, and a coop sold for 15 birds often has closer to half the 60 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 6.4 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. 15 birds in 150 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 15 chickens?
Plan on about 60 sq ft of enclosed coop floor for 15 standard sized hens, which is 4 sq ft each. Bantams can drop to roughly 30 sq ft total, and heavy breeds such as Orpingtons or Brahmas are more comfortable at 75 sq ft.
How big does the run need to be for 15 chickens?
A confined run should be at least 150 sq ft, about 13 ft by 13 ft. If the birds never free range, 225 sq ft keeps boredom, feather picking, and mud far more manageable.
How many nest boxes do 15 chickens need?
4 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 15 chickens need?
About 12.5 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 15 chickens eat?
Roughly 26.3 lb per week, or 112.5 lb per month, which is about 2.3 fifty pound bags. Foraging time lowers it, cold weather raises it.
How many eggs will 15 hens lay?
In peak season expect about 53 to 83 eggs a week, or 18.8 to 29.6 dozen a month. Production drops in winter, during moult, and as hens pass three years old.