I have two separate 8x12 buildings - one was the chicken house and the other was the goat house. The goat pen surrounded the chicken pen, and the goats wore down a section of fence so much I just cut it away, allowing the goats to have access to the chicken run and house. The goats don't really go into the house to sleep, they just go in there when they think there's food available (which, there isn't anymore since goats can NOT have chicken feed). Some of our newer chickens prefer to live in the goat house, and the problem I have is with chicken poop on the hay feeders. I have noticed that the chickens scratch at the goat house floor, trying to dig up worms and bugs, but I'm OK with that since they hopefully are eating anything growing under the hay on the floor like flies/fleas etc.
I feed my chickens in the yard and spread their feed around. My goats aren't allowed in my yard so the chickens are able to eat that way.