I built the playhouse style coop with an "upstairs" 4 by 4 area. It is tooo ugly for me to take a picture of (not painted), but it is very secure and solid. I have to say I am not so enamored of it as I was at first. The good thing is that they have a very secure area to hang "outside" if they don't get let out right away. And the roosting area is small, so I felt my two hens were a little cozier in the winter. I would never build smaller than 4 by 4, even for just two hens. But I hate not having a building where I can go in and just hang with them, and keep the food and do cleanup out of the rain. I don't have anywhere to hide from the hubby!
I do have an outside nestbox, and I love that feature.
10"w by 12"high is a good size.
10"w by 12"high is a good size.