Hi all, Im from North West Ohio and I have been raising chickens for about 3 years now. I found BYC coming across a search today on how big of a door for my chickens in their new coop. I think im going with a 9 inch by 9 inch door with a sliding door nearest the outside. I built this new coop which is a 4x5x10 structure with 4 levels, which houses 9 Rhode Island Reds, 1 Brahama, 1 White Rock at this time. The old coop which housed 3 chickens is an old doghouse which is about 3x4x3 with a medium sized dog cage sandwiched together so they can go outside, which is now my Cornish Rock coop. To add to all of this a friend just gave me 8 more Rhode Island Reds a week ago so now I am trying to decide how to make these girls more comfortable this winter.