Start with a straightforward frame and add shelter, ventilation, and predator protection

A chicken coop is a wooden box with a door, ventilation holes, and a run attached — you can build one in a weekend with basic tools and materials from a hardware store. The coop itself (where birds roost and lay) should be about 3 to 4 feet tall inside, with 3 to 4 square feet of floor space per bird. The attached run (where they peck during the day) needs 8 to 10 square feet per bird and must be covered with wire to keep predators out. The whole structure sits on blocks or concrete to prevent rats from burrowing underneath.

You do not need to be skilled at carpentry. A coop is four walls, a roof, a door, and wire mesh — all of which you can cut and fasten with a drill and a saw. The most common mistake is making it too small or not securing the wire tightly enough. The second most common is building it on the ground instead of raising it, which invites predators and rot.

Key Takeaways

  • A coop needs 3 to 4 square feet of interior space per bird and a covered run with 8 to 10 square feet per bird to prevent overcrowding and stress.
  • Raise the coop at least 12 inches off the ground on concrete blocks or a treated wood frame to block burrowing predators and allow air to flow underneath.
  • Use 1/2-inch hardware cloth (not chicken wire) to cover the run, because chicken wire tears easily and does not stop determined predators.
  • Cut ventilation holes near the roof and cover them with wire mesh to prevent moisture buildup and allow air movement without letting predators in.
  • Build a hinged roof or removable roof panel so you can reach inside to clean, collect eggs, and catch birds without crawling.

Gather materials and tools before you start

You will need 2-by-4 lumber for the frame, 1/2-inch plywood for walls, roofing material (corrugated plastic or metal works well), and 1/2-inch hardware cloth for the run. Do not use chicken wire — it is too flimsy and predators tear through it. You will also need wood screws (2 1/2 inches), hinges, a door latch, and concrete blocks or a treated wood base. A typical small coop costs between $150 and $300 in materials, depending on size and whether you use scrap wood.

For tools, you need a drill with a screwdriver bit, a circular saw or hand saw, a tape measure, a pencil, and wire cutters. A staple gun makes attaching hardware cloth faster, but you can use screws and washers instead. Wear work gloves when handling hardware cloth — the edges are sharp and will cut your hands.

Build the frame and walls in the right order

Start by building the base on concrete blocks. Lay four blocks in a rectangle on level ground, spaced about 4 feet apart if you are building a small coop. Cut four 2-by-4s to length (typically 4 feet for length and 3 feet for width), and screw them together into a rectangle on top of the blocks. This base keeps the coop off the ground and lets air flow underneath to dry out moisture and bedding.

Next, build the four walls. Cut 2-by-4 posts for the corners (about 3 feet tall) and screw them to the base. Cut 1/2-inch plywood to size and screw it to the posts. Leave one side partially open or build a removable panel so you can reach inside to clean and collect eggs. The back and sides can be fully enclosed; the front should have a door (usually 12 inches square) that you can open and close with a latch.

Before you attach the roof, cut two ventilation holes (about 4 inches square) near the top of the back wall and cover them with hardware cloth. These holes let moisture escape and prevent the coop from becoming damp and smelly. Moisture buildup causes respiratory illness in chickens, so ventilation is not optional.

Attach the roof and make sure water runs off

The roof should slope so water runs off and does not pool. Build a straightforward peaked roof by cutting two triangular end pieces and attaching a ridge board along the top, then screw plywood sheets to the frame. Cover the plywood with corrugated plastic panels or metal roofing material, fastened with screws and washers. Extend the roof at least 6 inches past the walls on all sides so rain does not run down the sides and soak the bedding inside.

A hinged roof panel on one side makes cleaning much easier than a fixed roof. Use heavy-duty hinges and a prop stick or chain to hold it open while you work. If you build a fixed roof, make sure you can remove at least one wall panel or have a large door so you can reach every corner for cleaning.

Build and find the run with hardware cloth

The run is a frame of 2-by-2s covered with hardware cloth, attached to one side of the coop. Build a rectangle about 4 feet wide, 8 feet long, and 2 feet tall (chickens do not jump high, but the run needs to be tall enough for you to walk into and catch birds). Screw the frame together, then staple or screw 1/2-inch hardware cloth to every side, including the bottom and top.

Overlap the hardware cloth at the seams and staple it every 4 inches so predators cannot peel it back. Bury the bottom edge 6 inches into the ground or fold it outward and pin it down with landscape staples — this stops raccoons and foxes from digging underneath. The top must be covered too; hawks and owls will take birds from an open run.

Install the door and latch so birds cannot escape

Cut a door opening in the coop wall (usually 12 inches square) and build a straightforward frame door from 2-by-2s and plywood. Attach it with hinges so it swings open and closed. Use a sliding bolt latch or a hook-and-eye latch that you can operate from outside — do not use a straightforward hook that a raccoon can open by pulling.

Many people build a second door between the coop and the run so they can lock birds inside the coop at night (when predators hunt) and let them into the run during the day. This takes more work but is safer and lets you control when birds go outside. The run door should also have a find latch.

Add bedding, roosts, and nesting boxes inside

Spread 4 to 6 inches of bedding on the floor — pine shavings, straw, or sand all work. Do not use cedar or treated wood shavings; they are toxic to chickens. Build roosts (wooden bars or branches) about 2 feet off the ground where birds will sleep at night. They naturally roost, so they will use them if you provide them.

Add nesting boxes (one for every two or three birds) in a dark, quiet corner. A nesting box is straightforward a wooden crate or a 12-by-12-inch box filled with bedding. Birds will lay eggs in them if the boxes are lower than the roosts and away from the main activity. Mount them on the wall so they are straightforward to reach but not so high that birds jump down and injure themselves.

Maintain the coop so it stays dry and predator-proof

Clean out wet bedding once a week and replace it completely once a month. Wet bedding causes ammonia buildup, which damages birds' lungs and attracts disease. Check the hardware cloth monthly for tears or gaps, especially around the bottom where predators push hardest. Tighten any loose staples and patch holes with additional cloth and staples.

In winter, make sure the coop stays dry but do not seal it completely — birds need air movement to stay healthy. In summer, add shade cloth over the run if it sits in full sun all day; chickens overheat easily. Check the roof for leaks after heavy rain and patch them when ready so the interior stays dry.

Frequently Asked Questions

How much does it cost to build a chicken coop?

A small coop for four to six birds costs between $150 and $300 in materials if you buy new lumber and hardware cloth. If you use scrap wood or reclaimed materials, you can build one for $75 to $150. Labor is your own time — a weekend project if you have basic tools.

Can I use chicken wire instead of hardware cloth?

No. Chicken wire is designed to keep birds in, not predators out. Raccoons, foxes, and weasels tear through it easily. Hardware cloth (1/2-inch mesh) is much stronger and will last years longer. The extra cost is worth it.

What size coop do I need for my birds?

Plan for 3 to 4 square feet inside the coop per bird and 8 to 10 square feet in the run per bird. A coop 4 feet by 4 feet inside will house four to five birds comfortably. Overcrowding causes stress, fighting, and illness.

Do I need a run, or can birds just free-range?

A run protects birds from predators while letting them peck and scratch outdoors. Free-ranging works only if you are home to watch them and predators are not active in your area. Most people use a run during the day and lock birds in the coop at night.

How do I keep the coop from smelling bad?

Change bedding weekly and make sure the coop has good ventilation — air flow dries out moisture and ammonia. Do not use cedar shavings or seal the coop completely. A coop that smells strongly of ammonia is too wet or too crowded.