The frame is basically 2x4s, 4' wide x 8' long x 4'+ high. The sides are cedar pickets cut in half. I used the notched tops of the pickets on the back so they are not seen even though my wife thought they looked nicer than the other sides. There is four nest boxes inside and a roost board. I put hardware cloth down inside and a ramp down to the ground level. I didn't think I would have two levels when I started, but once I got the hardware cloth down and the sides on there really was a lot of room underneath. The roof is just PVC corrugated roofing material on a plywood membrane. There is a door to reach in and get the eggs and another door on the bottom for the chickens to get in and out. I also put a hardware cloth covered opening on the opposite end of the picture above to let air circulate better. I was able to build it for roughly $250 which is cheaper than what I paid for my small coop that is sized for 4 chickens. This thing is huge and could easily house double the number I have in it.
I moved the 8 older pullets and laying hen we had to this house and then the 3 smaller chicks into the older coop we had. It was good to get the smaller chicks out of the house completely. The chicken tractor worked great for daytime use, but I worried about the days when it rained even though I used a tarp to protect them.
We have been introducing the smaller chicks to the big chickens, but have had some trouble from some of the pullets pecking the smaller chicks. It is understandable, but they seem to gang up and get the smaller chicks into a position where they are trapped. I have had to save one or more a couple times already. We are going to probably let my wife's aunt have 2 of the pullets to split them up some. We really have more chickens than we need.
All in all I am happy with the coop. It has good air circulation and is not hot when I put my head in there. I would have probably made it smaller if I had to do it again though. I have also found a great way to use the chicken tractor to help save our blueberries. I will write a post on that next.