A chicken coop is a wooden box with a roof, ventilation, and a door you can lock at night

A functional chicken coop has five essential parts: a frame made of 2x4 lumber, plywood walls, a roof that sheds water, ventilation holes near the top, and a door that closes securely against predators. The simplest design is a rectangular box roughly 4 feet long, 3 feet wide, and 3 feet tall—large enough for four to six chickens. You do not need electricity, running water, or concrete. You do need basic carpentry tools: a circular saw or handsaw, a drill, a level, a tape measure, and a hammer or impact driver.

Most backyard coops are built in a weekend using materials from a home center. The cost ranges widely depending on whether you use new or reclaimed lumber and whether you add features like nesting boxes or a run (the fenced yard attached to the coop). A basic coop without a run costs between $150 and $400 in materials. Before you build, check your local zoning rules—some cities limit the number of chickens or require the coop to be a certain distance from property lines and neighbors' homes.

Key Takeaways

  • A basic coop is a wooden frame with plywood walls, a sloped roof, and a lockable door, built from 2x4 lumber and standard tools.
  • Ventilation holes near the roof line prevent moisture and ammonia buildup, which cause respiratory illness in chickens.
  • The floor should be solid wood or concrete, not dirt, so predators cannot dig underneath and so you can clean out wet bedding.
  • A nesting box (a wooden shelf inside the coop where hens lay eggs) takes one afternoon to build and prevents eggs from breaking on the ground.
  • Check your city or county zoning rules before building—many places restrict coop size, number of birds, or distance from neighbors.

Build the frame from 2x4 lumber in a rectangle

Start by cutting four 2x4s to length: two at 4 feet (the long sides) and two at 3 feet (the short sides). Lay them flat on level ground and connect the corners with 3-inch wood screws—two screws per corner, drilled at an angle so they bite into both pieces. Use a level to check that the rectangle sits flat. If the ground is uneven, shim under the frame with shims or gravel until it is level.

Once the base is square and level, cut four vertical posts from 2x4s, each 3 feet tall. Screw one post to the inside corner of each rectangle corner, so the posts stand straight up. Then cut four more 2x4s to form the top of the frame—two at 4 feet and two at 3 feet—and screw them to the tops of the posts. Check the top rectangle with a level. The frame is now a hollow box.

Sheath the walls with plywood and add a sloped roof

Cut 3/8-inch exterior plywood sheets to fit each wall. You will need four pieces: two measuring roughly 4 feet by 3 feet (the long sides) and two measuring 3 feet by 3 feet (the short sides). Screw the plywood to the frame with 1.5-inch wood screws spaced 6 inches apart. Leave the bottom 6 to 12 inches of one wall open—this is where you will install the door.

For the roof, cut two pieces of plywood to form a peaked or sloped roof. A straightforward design is two rectangles meeting at a ridge: one piece 4 feet by 3 feet on one side, and another 4 feet by 3 feet on the other, tilted so water runs off. Screw them to the top of the frame and to each other at the peak. Cover the roof with roofing felt and shingles, or use corrugated plastic panels—both shed water and last several years. Overhang the roof 6 inches on all sides so rain does not run down the walls.

Cut ventilation holes and install a find door

Drill or cut four to six 2-inch holes near the top of each wall, just below the roof line. These holes let warm, moist air escape in summer and prevent ammonia from bedding from building up. In winter, the holes stay open—chickens generate enough body heat to stay warm as long as they are out of wind and wet. Do not seal them in cold weather; respiratory illness from poor ventilation kills more backyard chickens than cold does.

Cut a door opening in one wall, roughly 12 inches wide and 18 inches tall. Build a straightforward door from 1x6 boards screwed together in a rectangle, with plywood screwed to one side. Hang it with two heavy-duty hinges and install a slide bolt or hook-and-eye latch on the outside. The door must close tightly—a gap large enough for a rat to squeeze through is large enough. Test the latch by pulling hard; it should not budge. You will lock this door every evening and open it every morning, so make sure it is straightforward to operate in the dark.

Build a solid floor or lay hardware cloth to stop predators

If you built the frame directly on soil, predators will dig underneath. The safest floor is solid: either a concrete slab poured inside the frame, or plywood screwed to the bottom of the frame. Plywood wears out in three to five years and will need replacing, but it is faster to install than concrete. Screw 3/4-inch exterior plywood to the bottom of the frame with 2-inch screws every 12 inches.

If you cannot pour concrete or install plywood, lay 1/2-inch hardware cloth (a metal mesh) on the ground inside the frame and extend it 12 inches outward on all sides. Bury the outer edge 6 inches deep or pin it with landscape staples. Hardware cloth stops digging predators but is harder to clean and does not last as long as a solid floor. Whichever you choose, cover the floor with 3 to 4 inches of bedding—pine shavings, straw, or sand—and replace it weekly or when it becomes wet.

Add nesting boxes so eggs do not break on the ground

Hens lay eggs in dark, enclosed spaces. Build a nesting box by screwing together a wooden crate roughly 12 inches wide, 12 inches deep, and 10 inches tall. Mount it on the inside wall of the coop, 18 inches above the floor. You need one box for every three hens. Line each box with 2 inches of bedding—straw or pine shavings—and the hens will use it. Without nesting boxes, eggs roll around the floor, break, and attract predators.

Mount a perch—a 2x2 or 1x2 board—along the inside walls, 2 feet above the floor. Chickens roost (sleep) on perches at night, which keeps them off the wet floor and away from predators that hunt on the ground. Space multiple perches so each chicken has at least 8 inches of perch length.

Install feeders and waterers outside the coop to keep bedding dry

Mount a feeder and waterer outside the coop, in a covered run or under an eave. Feeders and waterers inside the coop get knocked over, spill into bedding, and create wet, ammonia-rich conditions that cause illness. A straightforward feeder is a PVC pipe with holes drilled in it, hung from a chain. A waterer can be a gravity-fed plastic base with a bottle screwed into it. Both are inexpensive and last years.

If you do not have a run yet, at minimum provide shade and protection from rain where the feeders sit. Chickens need fresh water every day, even in winter—ice over the waterer in freezing weather and break it twice daily.

Frequently Asked Questions

How much space do chickens need inside the coop?

Plan for 3 to 4 square feet of floor space per chicken inside the coop. A 4-by-3-foot coop (12 square feet) comfortably houses three to four birds. Overcrowding causes fighting, disease, and dirty conditions. Chickens also need outdoor run space—at least 8 square feet per bird—to scratch and forage.

What kind of wood should I use?

Use pressure-treated 2x4s for the frame and exterior plywood for walls and roof. Avoid treated wood for any surface chickens peck or roost on, as the chemicals can harm them. Cedar or untreated pine is safer for perches and nesting boxes, though it costs more.

Do I need to insulate the coop for winter?

No. Insulation traps moisture and ammonia, which cause respiratory illness. Chickens stay warm by huddling together on perches, as long as the coop is draft-free and ventilation holes stay open. A well-built coop with solid walls and a tight roof is enough.

Can I move the coop to a new spot?

Yes, if you build it without a concrete foundation. A wooden-floor coop can be lifted onto a trailer or dragged to a new location. Rotate the coop every few months to prevent the ground underneath from becoming bare and muddy. Moving also reduces parasite buildup in the soil.

What predators should I protect against?

Raccoons, foxes, hawks, and opossums are the most common. A solid coop with a locked door stops nighttime predators like raccoons. A covered run stops hawks during the day. Hardware cloth on the floor stops digging predators. There is no single perfect defense—layers of barriers work best.