Large Chicken Coop Building Plans

The first time I stood outside the frame of my newly built large chicken coop, I felt a rush of pride and relief. After weeks of planning, measuring, and cutting, it was finally taking shape. This wasn't just any coop—it was a thoughtful, well-constructed home for my flock, and the result of following large chicken coop building plans that I had spent hours researching and refining.

What started as a vague idea quickly became a detailed blueprint. I wanted a large chicken coop that could house 12 hens comfortably, with enough space for nesting boxes, a coop door, and a run area. It wasn’t just about size; it was about creating a safe, functional, and easy-to-maintain space that would last for years. Following large chicken coop building plans was the key to turning that vision into reality.^[1]

Throughout the process, I learned a lot—about materials, about construction techniques, and about the importance of planning every detail. This article is a culmination of that experience, a step-by-step guide to building your own large chicken coop using the same building plans that helped me build mine. It's for anyone who wants a sturdy, stylish, and practical chicken coop that will serve them well for years to come.

Planning Your Large Chicken Coop

As of September 2026, before you ever lay a board, take time to plan. Know how many chickens you want to house, how much space they’ll need, and where you’ll place the coop on your property. I found that 10 square feet per chicken is a safe rule of thumb, so for 12 chickens, that’s 120 square feet. Measure your yard to ensure you have enough room for the coop and a run area.

Next, sketch a rough floor plan. Include a nesting box for each chicken, a door for access, and a run area for them to roam. I used a simple 8x15 foot footprint, which provided enough space without being too overwhelming for a first-time build. This step also helps you figure out the number and size of materials you’ll need.

Finally, choose your materials. For my build, I used pressure-treated lumber for the floor and walls, and cedar for the roof and nesting boxes. I also made sure to budget for hardware like hinges, latches, and screws. Planning ahead ensured I didn’t run short on supplies and minimized waste.

Choosing the Right Materials

When I started my build, I was overwhelmed by the number of materials available. I settled on pressure-treated lumber for the base and walls, as it’s resistant to rot and pests. For the roof, I chose cedar because it’s naturally resistant to moisture and insects. I also used galvanized nails and screws to prevent rusting in wet conditions.

For the nesting boxes, I went with untreated cedar, which is safe for the chickens and allows for easy cleaning. I also made sure to include hardware cloth on the floor and walls to keep out predators like raccoons and snakes. This extra layer of protection was worth the investment.

I bought my materials from a local hardware store, which gave me the flexibility to pick up what I needed as I went. My total cost for the materials was just under $40, which included everything from lumber to screws and hinges.^[2]

The right materials make all the difference in a long-lasting, safe coop.

Related: Chicken coop building materials

Building the Frame and Base

I started with the base, which was the easiest part of the build. I used 2x6 pressure-treated lumber to create a rectangular frame that was 8 feet wide and 15 feet long. I laid it on the ground and used 2x4s to build up the legs, spacing them about 3 feet apart for stability.

Next, I built the walls. I cut the vertical and horizontal boards to size and assembled them into panels. I used a combination of screws and nails to secure the joints. For added strength, I also installed diagonal braces on the corners and midpoints of the walls.

After the frame was up, I added the floor. I laid 3/4-inch thick plywood over the base to make it easy to clean. I made sure to leave a few inches of space between the floor and the ground to allow for air circulation and to prevent moisture buildup.

“The first time I stood outside the frame of my newly built large chicken coop, I felt a rush of pride and relief.”— DIY Wooden Step Stool Plans editors

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Constructing the Roof and Walls

After the base was complete, I moved on to the roof. I used cedar planks cut to size and laid them in a simple gable roof design. I attached them to the top of the walls using 2x4 rafters, which I spaced about 16 inches apart for support.

For the walls, I covered the frame with 1x6 cedar boards, which I ran horizontally from the bottom to the top. I made sure to leave gaps between the boards for ventilation, which was essential in keeping the coop cool during hot summer days.

I also added a small overhang on the front of the coop to protect the door from rain. This simple addition made a big difference in keeping the door dry and preventing water from seeping in.

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Adding Nesting Boxes and Roosting Bars

I built the nesting boxes first. Each box was 18 inches wide, 12 inches deep, and 12 inches tall. I used untreated cedar for the boxes, as it’s safe for the chickens and easy to clean. I installed them on the inside of the coop, about 2 feet off the floor, so the chickens could easily access them.

Next, I added roosting bars. I used 2x4s, which I spaced about 12 inches apart from the floor. This gave the chickens a safe place to perch and sleep. I made sure to install the bars high enough to prevent them from falling off during the night.

I also added a small ramp from the nesting boxes to the roosting bars, which made it easier for the chickens to move around. This simple addition helped keep them comfortable and safe throughout the day and night.

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Building the Run Area

I built the run area as an extension of the coop, connected by a door. The run was 10 feet wide and 15 feet long, giving the chickens plenty of space to move around. I used hardware cloth for the walls and floor, which is a mesh made of galvanized steel that keeps out predators like raccoons and snakes.

I attached the hardware cloth to 2x4 frames, which I spaced about 2 feet apart for support. I used screws to secure the cloth to the frames, ensuring that it was tight and secure. I also added a small gate at the end of the run for easy access.

I made sure to install the run on level ground so that the chickens could move around easily. I also added a few perches and a small shelter in the run for the chickens to take cover during bad weather.

A secure run area keeps your chickens safe and happy.

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Finishing Touches and Maintenance

After the main structure was complete, I added a few finishing touches. I painted the exterior of the coop with a non-toxic, weather-resistant paint in a muted green color, which blended well with the surrounding landscape. I also added a small window near the top of the coop for ventilation.

I installed a door that was about 2 feet wide and 3 feet tall, with a latch that was easy to operate. I also added a small roof over the door to keep it dry during rain. This small addition made a big difference in keeping the door clean and dry.

Finally, I made sure to leave a few inches of space between the floor and the ground for air circulation. I also cleaned the coop thoroughly before putting the chickens in, making sure there was no debris or sharp edges that could harm them.

Large Chicken Coop Building Plans