My dear sweet husband is building a coop this spring for us. We saw one a friend has and love it. Its a rectangle shape with two solid sides (one side is the pole barn we already have and the other side is more siding that looks like the pole barn). The roof is the same siding on the pole barn too. The other two walls are chicken wire attached to 2x4's, I believe (I am the mother hen here, not the carpenter so forgive my ignorance if I use the wrong terms...). This will be on a dirt floor, and will have the waterers/food hanging from the roof. Outside will be a large fenced yard just for them (which is inside the goat pasture, so if they get loose for some reason, they are still fenced in). I think the dimensions are 10 ft out from the barn wall, 8 ft tall, and about 18 feet in length. Inside the entire structure is a smaller little house with a little chicken ladder that has roosts in it and nesting boxes. My question is, how big is this roosting/staying warm/nest box area supposed to be? We do live in 4 season weather. I have 18 chicks coming the first week of April from Meyer, and am hoping to have a total of about 25 birds in the coop within another year. My friend's is quite small with 11 full grown chickens...it can't be bigger than 15 sq ft, total. It seemed almost too small to me, but the day I visited it was about 30 degrees with snow on the ground and her birds were very content in the litter bigger screened in area. Are we on the right track? Is there anything else we need to consider?