My coop is only 4x6....and it sits atop the run which is the same size. I only have three chickens, though and they're tiny yet. But I hope to let them free range, too.
The main one is 8x12 and houses 31 chickens (full grown)
the new one is 8x8 and will first house the 25 meaties and then it will house part of the 130 pullets that are in the brooder...
Our chickens all free range, and some of them roost in the barns, so I am not too worried about coop space. We have 300 acres for them to roam around on.
8 x 4 x 5 tall. Its 2 feet of the ground allowing for a 2 story. We only have 8 birds in it and they are still young. Will post photos as soon as I can.