How to Convert a Shed to a Chicken Coop

Yes, you can convert a shed to a chicken coop, and it is often the cheapest way to get a walk-in coop: the floor, the walls, the roof and a person door are already there. What a storage shed lacks is everything that keeps hens healthy and safe at night. It needs screened vents high in the walls, 1/2 in hardware cloth over every opening, a small pop door with a ramp, nest boxes, roost bars and a run. The size of the shed decides how many hens it can hold, and that number is the first thing to settle, because the nests, the roost length, the vent area and the run all follow from it.

This guide measures a shed against the same flock rules our coop designer runs on every coop, with the extension source behind each one, and gives the hen count for seven common shed sizes.

How many chickens fit in a shed

Floor area inside the walls is what limits a shed chicken coop, not the outside footprint. Walls take up room: with 2x4 framing, an 8x10 shed measures about 89 x 113 in inside, or 69.8 sq ft. Measure your own shed inside the studs before you count birds.

The floor rule our designer uses

For standard laying hens that have a run, the designer asks for 4 sq ft of coop floor per bird and accepts 3 as the least. Virginia Tech (2023) and the Cooperative Extension recommend 3 to 4 sq ft, and Oregon State gives 3 as the floor. If the hens will never go outside, the figure jumps: Oregon State asks for 8 to 10 sq ft per bird with no outdoor access, and the designer uses 10. That second number matters more for a shed than for a small coop, because people sometimes plan a shed coop with no run at all.

Shed sizes and the hens they hold

These figures come from our designer’s engine, run on each footprint with 2x4 walls, standard hens and the default rules: 4 sq ft per hen with a run, 10 without, one nest box per 4 hens, 8 in of roost per hen and the 1 per 10 vent rule of thumb.

The vent target is the same with or without a run, because the rule of thumb is per square foot of floor, not per bird. With no run, the smaller flock needs fewer nests: two boxes cover 6 hens in the 8x10 and three cover 10 in the 10x12.

The run the flock needs outside

A shed with a run holds more than twice the birds, but the run has to be big enough. The designer asks for 10 sq ft of run per standard hen, the figure from Virginia Tech, the Cooperative Extension and Colorado State; NC State’s minimum is 4 to 5. So 17 hens in an 8x10 shed need a 170 sq ft run, and 26 hens in a 10x12 need 260 sq ft. NC State also asks for a run that reaches at least 6 ft out from the coop, and Penn State wants it covered against hawks and owls. The chicken run guide covers the posts, mesh and apron, and how much space chickens need puts all the space rules side by side.

Is your shed worth converting

Before you buy hardware cloth, check that the shed is a good starting point. A coop has to stay dry, close tight and let you clean it, and some sheds will fight you on all three.

Dry, sound and on a level base

Look at the floor first. Soft spots, rot along the bottom plate or a floor that sits in a puddle after rain will only get worse with wet bedding and droppings on top. A shed on skids or blocks with air under the floor is easier to keep dry than one sitting on the dirt. If the base needs work, fix it before the hens move in, not after.

Gaps a predator can use

Walk around the outside and look at the joints: where the siding meets the floor frame, the corners, the door edges and the gap under the roof. Utah State notes that chicken wire is not a barrier to predators and that rats bite through it, and the Cooperative Extension says least weasels squeeze through holes as small as 1/4 in. Any gap you can slide a finger into needs to be closed with wood or covered with hardware cloth.

Room to stand and clean

A storage shed usually has walls tall enough to stand in, which is the real advantage over a small coop. Our walk-in coops use 72 in walls for the same reason: you clean, collect eggs and fill feeders from inside. Check that the door is wide enough for a wheelbarrow or at least a muck bucket, because you will be carrying bedding in and out for years.

When a new coop is the better buy

If the shed needs a new floor, new siding and a new roof, you are building a coop inside an old box. At that point, compare it with a new walk-in coop from our free plans: the 8x10 plan holds the same 17 hens, sits 24 in off the ground on legs and comes with every vent, nest and roost already placed.

Add ventilation high in the walls

This is the step most shed conversions get wrong. A storage shed is built to keep air out. A coop needs air moving through it all year, without blowing across the birds at night.

How much opening a shed coop needs

Aim for about 1 sq ft of screened opening per 10 sq ft of floor. That figure is a builders’ rule of thumb, stated by Oak Hill Homestead and repeated by calculator sites, and no extension guide we read gives a number. A 1 sq ft per bird version also circulates in forums, and The Featherbrain calls both formulas bogus. We use 1 per 10 as a target and the smell of the coop as the test: Penn State says dampness and ammonia mean the coop has too little air for its flock. For an 8x10 shed, the target is about 7 sq ft; for a 10x12, about 10.8 sq ft.

Open the eaves and the gables

The best places are the ones extension guides name. Oregon State lists vents in gables, eaves or roofs, and windows in walls. On many sheds the gap between the top of the wall and the roof deck, between each pair of rafters, is closed with blocking. Take the blocking out on the side away from the roosts and screen each bay with hardware cloth. Then cut a vent high in each gable triangle. In our 8x10 walk-in coop, open eave bays on one side give 3.25 sq ft and two gable vents give 3.68 sq ft, with one small wall vent making up the rest, 7.3 sq ft in all.

Keep the air off the roosts

Penn State is clear that vents and windows must not open directly over the perching area. Utah State wants the winter air to come in near the roof so it warms as it drops. In a shed, that means the eave on the roost side stays closed, and any existing window at roost height gets covered or left shut. The ventilation guide works through vent placement for eight coop sizes.

Make every opening predator-proof

A shed coop is only as safe as its weakest opening. Vents, windows, the pop door and the floor edge all count.

Hardware cloth, not chicken wire

UC Davis Cooperative Extension says openings should not exceed 1/2 in, and the University of Maryland puts 1/2 in hardware cloth over windows. Colorado State goes further and wants nothing larger than 1/4 in when the coop is closed. Our default for every vent is 1/2 in galvanized hardware cloth, lapped 1 in over the framing on every side and fixed with washer-head screws every 6 in. As one price point, Lowe’s Atlanta-Edgewood store listed a 2 ft x 10 ft roll of 1/2 in, 19 gauge hardware cloth at $23.98 on Oct 8, 2026. The hardware cloth vs chicken wire guide explains the gauges and mesh sizes.

The floor edge and underneath

New coops get their defense from height and mesh. Oregon State asks for a floor at least 1 ft off the ground against rats, snakes and raccoons, and Utah State puts heavy wire mesh under the subfloor. A shed on skids is lower than that, so close the gap between the floor frame and the ground. Our suggestion, not an extension figure: run hardware cloth from the bottom of the siding down and 12 in out along the ground, pinned, the same way a run apron is laid.

Doors and latches

The shed door becomes your person door. Oregon State hangs coop doors to open out so every corner can be cleaned. Fit a latch a raccoon cannot work, such as a spring-loaded gate hook that needs two moves to open, and check that the door closes tight along all four edges.

Fit the inside: nests, roosts and the pop door

These are the fittings that turn a box into a coop. Their sizes and heights come straight from the flock rules.

Nest boxes

Give one box for every 4 hens, as Oregon State and UNH advise, and never fewer than 2, which is Kentucky’s minimum. A 12 x 12 x 12 in box is the most repeated size. Utah State and Colorado State put the box floor 18 in above the coop floor, and Oregon State’s sloped roof over the boxes, at 45 degrees, keeps hens from sleeping on top. In an 8x10 shed with a run, that is 5 boxes; in a 10x12, 7.

Roost bars and a dropping board

The designer asks for 8 in of roost per standard hen, from Virginia Tech’s 8 to 10 in range, and accepts 6 as the least, Penn State’s figure. Set the bars about 24 in up, 12 in apart and 12 in from the wall, with a dropping board 12 in below, as Utah State asks. In an 8x10 shed, two 2x4 bars running along the 113 in inside depth give 226 in of roost against the 136 in that 17 hens need. Bantams and heavy breeds sit lower: the designer starts bantam bars at 16 in and large breeds at 18 in.

The pop door and the ramp

No extension source gives a pop door size. The designer uses 10 x 13 in for standard hens, with the sill 6 in above the floor, a coop builder’s figure from The Featherbrain. Cut it in the wall the run is built against, frame it with a header like any other opening, and fit a door you can bolt at night. The ramp climbs from the ground to the sill. Our ramps sit at 45 degrees, so the ramp is about 1.4 times the rise: if your shed floor sits 8 in up, add the 6 in sill for a 14 in rise and a ramp about 20 in long. Penn State asks for slats about 3 in apart for grip.

Shed chicken coop plans from our designer

There is no single plan for a shed conversion, because sheds differ. What carries over is the layout.

Draw your shed as a walk-in coop

Open the coop designer with an 8x10 walk-in for 17 hens and set the width and depth to your shed. The engine places the nests, roosts, vents and pop door, checks each against its source and lists the hardware cloth pieces for every vent. Copy those positions and heights into your shed. If your shed is a different size, change the two numbers; the hen count, the run and the vent target update with them.

Building a shed to be a coop from day one

If you do not own a shed yet, our sister site has a free shed designer and plans such as the 10x12 gable shed. Framing a new shed with the coop in mind lets you leave the eave bays open, put the window away from the roosts and frame the pop door before the siding goes on. By our flock rules, that 10x12 holds 26 standard hens with a 260 sq ft run.

Permits and local rules

Rules on keeping hens, and on building or altering an outbuilding, vary by town and county. In the model code, the 2021 International Residential Code (R105.2) exempts one-story detached accessory structures up to 200 sq ft from a building permit, but your jurisdiction may set a different line, and the exemption does not cover zoning or poultry rules. Call your building department and your city or county office before you start.

A shed conversion checklist

Work through the list in this order and the shed will be a coop before the hens notice the difference.

The order of work

1. Measure the inside floor and settle the flock size from the table above.
2. Repair the floor and base, and close every gap over 1/2 in.
3. Open the eave bays on the side away from the roosts and add a gable vent at each end, all behind hardware cloth.
4. Cover or fix shut any window at roost height.
5. Cut and frame the pop door on the run side, with its ramp.
6. Fit the nest boxes at 18 in and the roost bars at 24 in with a dropping board.
7. Build the run, covered, at 10 sq ft per hen.

What to check when it is done

Open the coop on a cold, still morning. If it smells of ammonia or the bedding is damp, add vent area high in the walls. If the hens crowd the top bar and leave the lower one empty, the bars are at different heights; set them level. And if you would rather start from a drawing, the 8x10 coop plan and its builder’s plan, at $29, give every cut for a coop the size of a common shed.