Stage 2 — weeks 4 to 8
Four published figures decide whether a coop fits a flock. Here they are, laid out by bird count, with the arithmetic done on real coops.
By Scooter M.·Published September 1, 2026
The short answer
Laying hens need 3 to 4 square feet of coop floor and 10 square feet of run each, 6 to 10 inches of roost bar, and one nest box per four to five birds. Those figures come from poultry.extension.org and University of Maryland Extension, and they are what any coop capacity claim should be checked against.
| Measure | Figure | Published by |
|---|---|---|
| Coop floor, laying hens | 3 to 4 sq ft per hen indoors | poultry.extension.org |
| Outdoor space | 10 sq ft per hen | poultry.extension.org |
| Coop floor, alternative | At least 3 sq ft with run access; 8 to 10 sq ft with none | Oregon State University Extension EC 1644 |
| Coop floor, minimum | 2.5 to 3.5 sq ft inside, plus 4 to 5 outside | Cornell Cooperative Extension |
| Perch space | 6 to 10 in per bird | University of Maryland Extension |
| Perch height | No higher than 4 ft above the floor | University of Maryland Extension |
| Nest boxes | One nest per 4 to 5 birds | University of Maryland Extension |
| Nest height | 18 to 20 in off the floor, on the ground for pullets at first | University of Maryland Extension |
Note that Oregon State’s figure introduces the variable that everything else turns on: whether the birds have outdoor access. At least 3 square feet with a run; 8 to 10 without. That single distinction is the reason coop capacity claims and extension figures appear to disagree — they are answering different questions.
| Birds | Coop at 3 sq ft | Coop at 4 sq ft | Run at 10 sq ft | Roost at 8 in | Nest boxes |
|---|---|---|---|---|---|
| 3 | 9 sq ft | 12 sq ft | 30 sq ft | 24 in | 1 |
| 4 | 12 sq ft | 16 sq ft | 40 sq ft | 32 in | 1 |
| 5 | 15 sq ft | 20 sq ft | 50 sq ft | 40 in | 1 |
| 6 | 18 sq ft | 24 sq ft | 60 sq ft | 48 in | 2 |
| 8 | 24 sq ft | 32 sq ft | 80 sq ft | 64 in | 2 |
| 10 | 30 sq ft | 40 sq ft | 100 sq ft | 80 in | 2 |
| 12 | 36 sq ft | 48 sq ft | 120 sq ft | 96 in | 3 |
This takes about a minute and it is the most valuable minute in the whole purchase.
Not dramatic collapse. It looks like feather picking, a hen at the bottom of the order with a bare back, bullying at the feeder, more mites because birds are in closer contact, more ammonia because there is more manure in the same volume, and eventually egg eating. People generally blame the breed. It is almost always the space.
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The two coops in this comparison that publish enough to be checked, plus a nest box sized for a backyard flock.
Omlet
13.3 sq ft interior
The large plastic coop, and the only model in Omlet's own comparison table that lists adjustable ventilation — which is the spec that matters most in a coop you cannot see inside on a January night.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
Omlet
7.8 sq ft interior
A plastic coop that hoses out, with published interior dimensions you can actually check — and once you check them, a six-hen claim that only works because the run is permanently attached.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
Best Nest Box
24 x 19.5 x 20 in
The same roll-out mechanism in a two-foot box, which is the version that actually fits a backyard coop rather than a commercial layer house.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
3 to 4 square feet of indoor floor space per laying hen, published by poultry.extension.org, plus 10 square feet of outdoor space. Oregon State University Extension publishes at least 3 square feet where a run is available and 8 to 10 square feet where the birds have no outdoor access at all.
6 to 10 inches of perch per bird, published by University of Maryland Extension, with perches no higher than four feet above the floor. At the 8-inch midpoint, six birds need about four feet of roost bar. This is a separate check from floor area and a coop can pass one and fail the other.
Find the published interior dimensions, multiply length by width in inches and divide by 144 for square feet, then divide by the stated bird count. Compare with 3 square feet per hen. Above it, the claim holds under confinement; below it, the claim depends on the attached run being open every day.
Feather picking, bullying at the feeder, a bird at the bottom of the order with a bare back, more mites from closer contact, more ammonia from more manure in the same volume, and eventually egg eating. These are usually blamed on breed or temperament and are almost always about space.
Every figure cited on this page came from one of these documents. If one of them has changed since we read it, the number here is out of date and we would like to know.
Coops, automatic doors, bedding and predator hardware, with the capacity math done against published extension figures.
What six birds actually need against what six-bird coops publish — and the gap between the two.
The 12 to 16 sq ft target for four birds, and which coops actually deliver it rather than claim it.
Three is the practical floor, six is where most keepers land — with the published space figures that turn a bird count into a coop size.
Why sealing a coop causes frostbite, where the openings go, and how to tell ventilation from draft.