This is a huge pet peeve of mine! We see folks on here all the time that fall prey to this---"they have plenty of space, the coop/run is designed for 8 birds and we only have 6 so they have plenty of room, why are they trying to kill each other?" "exactly how big is the coop/run, in feet?" "Oh, it's plenty big, the coop is like 4x4 and the run is 3x8, according to the manufacturer they have lots of space, so that isn't the issue, so why are they trying to kill each other? Do I need pinless peepers or to debeak one?"![]()
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Exactly.
And when you ask how big the coop is they rarely give dimensions because they don't believe that's the problem.
Also, people don't consider that what counts is interior dimensions subtracting space taken by whatever else is in there, i.e. feeder, water, nest boxes, etc..
I teach classes at area community colleges and various green venues. I emphasize the importance of space and spell out in the handouts how much square footage is absolute minimum for various management techniques. Do they listen? No. Do they review the written material when they get home? No.
They still go by what the manufacturer says.

How hard is it to get out a tape measure and multiply?