If it is 4x4 like some others have said, my experience is that 7 chickens will fight in there. It could work if you live somewhere with no inclement weather and had no predators so you could leave the door open so they could pop out as soon as they see but such places don't really exist. A covered coop-secure run might make it feasible? Most people don't have this and comments have suggested that you don't either.
The smaller the coop the more important extra space really is and with a 4x4 coop you're pushing that extra space to its limit. 4sqft is a 2x2 square - really not a lot. That's suggested as the minimum so that a chicken has room to spread its wings, dig, turn in a circle, dust bathe, etc. without touching another bird. In a large group this is less important - it's unlikely that none of the chickens will want to touch and will want to use all their space all the time. In a group of 4 it's VERY possible that all four will utilize the entirety of their personal space at once. If they can't utilize their space when they want to, they will peck each other, which leads to feather picking, stress, higher parasite levels, and a host of other issues. For reference, 6 chickens would be the legal limit for that space in many of the suburbs where I live. 10 would be the maximum legal limit state wide. You're coming awfully close to CAFO stocking levels in a coop that size. Just one broody hen with chicks would make it illegal state wide. (Chickens confined for any period of time require 1.5sqft/bird unless being transported in my state.)
It's also deeply unsuitable for broody chickens. When I had a 4x4 coop all my broody chickens had other hens trying to lay in her nest and broken incubated eggs, and then tried to sleep outside as soon as the chicks were hatched and refused to lead them up the ramp at night. Now that I have a 4x8 with four external nest boxes and three roost bars I can isolate the broody hen easily long term for the brood and she gladly leads them back up the ramp, even with a greater stocking ratio.
Now. MAYBE you're not having any problems - that's good for you! If someone else replicates it they are VERY unlikely to have the same results... And then most of us hear "Well we learned XXX from a vlogger" and we try to fix it after someone has invested time or money or expectations into a big project. Better to stop it before it starts by pointing out the flaws at the source.
But I aint getting paid teacher wages to tell you about it, so my posts can speak for themselves for anyone who sees em.
