Halfpasthen
Songster
Just because they "fit" doesn't mean there won't be problems.
What about nest boxes?
Inside or hanging off the side?
Food and water inside or out?
Roof height from the floor?
A higher roof means more air volume which means less humid. Humidity and cold winters are a disaster waiting to happen.
I have 22 hens in an 8x14 coop mine spend quite a bit of time in that coop in winter. It gets pretty pooped up quickly.
That's another consideration.....cleaning and manure management.
The 30 square foot of space you currently have will work for 7 hens only.
I strongly recommend making part of all of the barn chicken space or building a 10x10 coop.
This is my thought also. I’m sure you could cram birds into a coop but that doesn’t mean you should.
The ammonia alone is going to be a huge issue. Not considering the behavioral issues that crop up when animals aren’t given the space they need.