I have a 4'x8' (outside dimensions) chicken coop that now houses 5 chickens. I'm planning on getting some new chickens once it's warmer, but I'm confused as to how many chickens would fit into the existing chicken coop. Some sources say 3 to 4 sq. ft. per chicken, which would equal 10-11 chickens in a 4x8 coop. However, I've seen several different websites advertising their 4x8 chicken coops can house 15-20 chickens. And their 4x6 coops say they house 12-15 chickens. So, how many chickens would you put in a 4x8 chicken coop. During good weather, the chickens have access to big fenced-in area and only spend time in the coop for sleeping, eating and laying eggs. Only during the winter do they spend most of their time inside, except for when it's warm enough for them to go out. (This one is of the chicken coop before it was used; the inside has been changes quite a bit. They are no longer using the wire floor, just bedding on the actual floor. Plus, they have different waterers and feeders.) Here's my girls: Also, I'm thinking of the older ones and new ones "sharing" the coop, while being separated by chicken wire until they get used to each other. That is, I'd move the chicks to the outside chicken coop once they are 4 to 5 weeks old, as suggested by BYC, but they'd be separated from the bigger ones until they are older or get used to each other. I mention this because I'm thinking about getting anywhere from 10 or 12 to 15 chicks (depending on if I can find someone to share an order of 25) , and they have to share space with 5 other chickens until the new ones start laying their eggs. Then, the 5 older ones would be culled. But, I'm not sure if I have have enough room in my existing chicken coop, and how much I'd need to add on if I didn't. (I thought of adding 5' long section to the left of the nesting boxes, but I'm not sure.) I'd like your imput.