No harm, no foul (fowl?).
Since you question was related to size, and since these forums get reviewed over time and read by a lot of folks......this might be a good place to post a reminder.
Chickens, and for that matter, almost all animals, including us, require a minimum amount of space to be comfortable. "I need my space"? As for farm animals raised in confinement, generally the goal of commercial producers is to get as much bang for the buck from structures as possible......so they pack in as many animals as they can get away with before the social issues caused by crowding becomes counterproductive. For laying hens in confinement, that is generally thought to be about 4 SF per adult laying hen. Again, that number goes back at least 100 years. Commercial egg producers have pushed that envelope up a lot to the point of packing birds into cages with less than 1 SF per bird......no run. But they have to do all sorts of unmentionable things to the birds to accomplish that. Nothing we would ever consider doing.
Yet it can be confusing. There are so many conflicting stories, not to mention all the small commercial houses made for backyard growers that have totally unrealistic claims of capacity. I am amazed at how far up the ladder these conflicting stories go. Here is information lifted from an Internet chicken guru as far as his recommendations for the basic design of your coop:
One square foot per chicken if they have at least three square feet of outdoor space.
Build large enough to handle future growth.
Three square foot per chicken minimum if their house is permanent and they won’t have access to the outdoors (not recommended).
A lot of the rest of what was posted on that site looks correct (deep litter, etc.) but I would be curious where he got his space requirement numbers. They seem awfully extreme to me.
If followed literally, by my calculations, the OP would be able to house 6 adult birds in the coop pictured. Really?
In short....... "stray from the known and proven formula that works, you pay the price".
Edited by Howard E - 6/4/16 at 6:33am