Quote:
Good for you to notice and think of this now
6x6 is 36 sq ft, which would be 3.3 sq ft apiece for 11 chickens (plus whatever free range or run you provide them).
Me, I've kept chickens at 4 sq ft apiece indoors (plus ample run) and at 15+ sq ft apiece indoors (plus ample run), and I'm talking *summertime* here, and they really DO behave a lot differently with more space available.
So personally I feel that even though you CAN keep them in the more crowded condition, especially if you are in a location with mild winters, it is really better to give them a lot more room.
That said, 3-4 sq ft apiece indoors (plus free range or run) is generally enough to avoid the worst chances of cannibalism AS LONG AS you do not have many days of nasty weather when they won't want to go outside.
If you CAN make the coop bigger, I'd say for sure go for it -- for instance, it would not cost meaningfully more to expand to 6x8 because plywood is 8' long, or even 8x8 although then you'd have to undo all the framing plus have a little more rafter/truss support for your roof.
If you realistically can't, well, your chickens would be happier (and your managmenet would be easier!!) if you reduced your flock size somewhat, but it is not like it's radically
unreasonable to keep them at 3.3 sq ft apiece indoors plus run, at least not if you have mild winters.
Good luck, have fun,
Pat