We have a 12x12 horse stall with a 4Hx4Wx4L "sleep box" or "hen house" inside it, then a 4ft wide 20ft long fenced-in run for 11 hens. The stall/run can accommodate about 22 hens comfortably, but the "sleep box" could probably only handle 2-3 more birds before needing an addition.

My girls have a main room of 32 square feet with a vestibule of 16 sq ft. I have either a surface or perch running around the perimeter to give them room to roost. At most I had 16 birds in there that would pretty much only be in there to sleep. I open them up every morning to roam around my property. In the summer, when I can get the gate to stay closed because there's no snow, I close them off into an approx 20'x50 pen area.

4x6 and 10 birds. Yes, currently on the overstocked side per internet recommendations. Nobody has eaten each other yet though and they get out during the day.

5'x8'x5' coop with a 18'x30' Run. 17 birds.

We’re at roughly the same ratio and they seem (mostly) fine. One hen has been harassed on and off by the others but nothing crazy, and only seems to happen during the winter when they’re a little more hemmed in. Now that the snow is largely melted, they’re fine.

8'x8'x6' with a 10'x 25' run. Have 11. Had 13. Want more