The only problem I had with snap coops is their sq ft. The big one would of suited my needs but it was $700. The big one would of given me 4 sq ft for the 4 birds and a nest box for each. Yes, you can get away with 2 sq ft anywhere else and it fit 8 standard birds/ 12 bantam. But with my extreme high temperature issues, I'd be asking for trouble.If you are talking about the snapLock coops - it partly depends on your chickens. Mine are outdoors except when laying, and roosting at night. To roost at night, they only need space on the roost. In the small size, I have right now 4-hens and a rooster. Probably not optimum but it is particularly cold - so they can help keep each other warm, and I have fairly small 'standard sized' chickens. My hens weigh about 4-pounds and my rooster weighs a bit over 5 at the last weighing. There is one roosting bar and they all fit on - and they have three nest boxes, of which they all lay in the one farthest from the door - only 3 of the four have picked up laying this year.
The larger one - has 3-roosting poles the same size as the one roosting pole in the small coop. If you live where the weather is bad, or if your chickens are indoor chickens, then it would be too small for them to live in. Mine used to free-range and then I would close and latch the door at night -- Now they have the cattle panel "run" and when I have to be gone, I just keep them locked in there - so I know they are safe, I have had a LOT of racoons kill a lot of my chickens and chicks...sadly, and I have hawks, snakes, - you name it - they are here. Oh now, since they are safe inside the wire I don't open and close the coop door - just let them come and go in and out as they wish ---- easier on the chicken owner....
Here's a link to snapLock's website - they cost a lot - but they can be assembled in a VERY short time, I know for a fact racoon cannot get in if it is properly latched at night - and racoons are wicked smart....so I am very happy with them, and probably would get more if I expanded to more breeding pairs or trios to keep them all separated.
ETA - snap lock gives you plans to build the 'legs' with the correct sizes to cut the 2x4's and the legs fit both the large and the small coop base...how cool is that?ETA- earlier I had said that the large size has 6-nest boxes, but looking at the picts, I see that it is 4 - which is a LOT of nest boxes... That large coop is at a different ranch than this - so I didn't check it - I was just going from memory. :O)
http://snaplockchickencoops.com/chicken-coop-pictures.html
Snaplocks are only 40-60 pounds so I can easily move around by my self if I need to, and they meet my criteria for safety, low maint, easy to clean, and I can build and relocate with no one helping me. :O) HTH