A 4x8 coop is 32 sq ft on the outside and 23 sq ft of actual bird floor in our shed and lean-to designs, which is a four-to-six-hen coop or about eight bantams. The 4x8 A-frame tractor is a different animal: 10 sq ft of coop floor and 16 sq ft of run for 2-3 hens. The three cost $2,250-$2,900, $2,100-$2,750 and $675-$875 in materials.
We already run a 4x4 coop guide that answers “how many chickens fit” for the smaller footprint. This page does the same job one size up, with three real designs to choose from.
Three 4x8 designs compared
| Design | Bird floor | Run | Hens | Wall height | Windows | Materials | Build |
|---|---|---|---|---|---|---|---|
| 4x8 shed coop | 23 sq ft | 32 sq ft | 4-6 | 48 in | 3 | $2,250-$2,900 | 16-24 hrs |
| 4x8 lean-to coop | 23 sq ft | 32 sq ft | 4-6 | 48 in | 2 | $2,100-$2,750 | 12-18 hrs |
| 4x8 A-frame tractor | 10 sq ft | 16 sq ft | 2-3 | no walls | 0 | $675-$875 | 14-20 hrs |
The shed and lean-to share a floor, a run and a flock. The difference is the back wall. The lean-to leaves it off and borrows a garage wall or sets two posts beside a fence, which takes about $150 and 4 to 6 hours off the shed. It only makes sense if you have a wall worth leaning on; our lean-to page covers the attach options and why you never hang a coop off a fence.
So how many chickens fit in a 4x8?
Four to six standard hens in the shed and lean-to. At four hens each bird has 5.75 sq ft of floor, at six it is 3.8. Oregon State Extension’s EC 1644 sets the floor at 3 sq ft per bird when there is a run, so six clears it, and Penn State Extension’s housing table says 2 sq ft for large chickens indoors and 10 outdoors.
The run is the tighter number. The 32 sq ft run gives four hens 8 sq ft each, which meets Penn State’s laying-hen figure, and six hens 5.3 sq ft, which does not. Four hens can live in it full time. Six want yard time.
Bantams change the arithmetic in your favor, with a ceiling you can calculate. Penn State lists bantams at 1 sq ft indoors and 4 outdoors, so the 32 sq ft run tops out at eight. Both 4x8 coops have two nest boxes, and USU Extension recommends one box per four to five hens, so two boxes is also an eight-to-ten bird limit. Eight bantams is the number we would stand behind.
What you outgrow a 4x8 with
The seventh hen, in this order. First the roost: the plan allows 60 inches, 10 per bird at six, so seven birds drop to 8.6 inches each, still inside USU’s 6-10 inch range. Then the nests, since two boxes serve six comfortably and seven is past our comfort. Then the run, which is already short at six. If seven or more is even a maybe, the next honest step is the 6x8 family, which our 6x8 comparison lays out.
For the other direction, a flock of six sits at the top of everything on this page; the plans for 6 chickens page compares the 4x8s with the 6x8 and a 6x10 tractor so you can see what the extra room costs.
The 4x8 sheet-goods logic
A 4x8 footprint is exactly one sheet of plywood, so the floor deck is a single 3/4-inch sheet with no waste and no seam. Both coops list five sheets of 3/4-inch plywood and one of 1/2-inch in total. The tractor works from three sheets of 1/4-inch exterior ply and one of 1/2-inch. That is part of why this size is quicker to build than it looks: the shed budgets 16-24 hours, the lean-to 12-18, and the lean-to is a faster build than our smaller 4x6 despite the bigger floor.
The tractor is not a small coop
The A-frame tractor houses 2-3 hens at 10 sq ft of floor. It has no windows, 1.6 sq ft of ridge vent and no insulation, and you have to move it. Loaded with bedding, feed and a rainy night it weighs about 375 lb by the plan’s own arithmetic, which is one person on firm level ground and two on soft ground. It has no buried apron because you cannot bury something you drag; quarter-inch hardware cloth runs underneath the birds instead.
If you want more than three hens on pasture, the same plan family steps up to the 6x10 A-frame at $800-$1,025 for 4-6 hens. Our chicken tractor plans guide covers the move routine.
Permits and footprints
Coop and run together measure 192 by 48 inches, 64 sq ft, for both fixed 4x8s. Our permit guide cites a 200 sq ft model-code exemption for detached accessory structures and notes that many local codes tighten it to 100 or 120. At 64 sq ft you are under all of those, but setbacks and flock caps are separate rules and are the ones that actually decide placement.
A hot yard or a cold yard
The floor sits 14 inches off the ground, above the one foot Oregon State Extension gives for discouraging rats and snakes, and that strip is shaded in summer. Texas A&M AgriLife’s specialists say a coop in continuous afternoon sun can become a furnace and that shade, cool water and airflow are the fixes, so of the three, the three-window shed is the better hot-yard 4x8. For cold, Michigan State Extension’s advice is a draft-free but well-ventilated coop and bedding doubled over summer depth. Neither 4x8 coop is insulated, and the tractor should not carry a flock through a hard northern winter.