The actual chicken coop needs to be at least 3 square foot per chicken.
If you have laying hens, they will need one nest box or one square foot of community nesting space per 4-5 hens. Most laying chickens like to roost. A good rule of thumb is 6-10 inches of roosting space per bird. Roosts should be at least 2 feet off the ground, as should nest boxes.  The optimum space for chickens is 3 to 4 square feet per bird. Chickens like to move around so the more space you provide the happier the hens. If you keep too many in a small enclosure they will pick at each other and fight. As a rule of thumb, the more room your chickens have then happier and more healthier they will be. Another factor to consider is the actual size of the bird. For exam … ple Bantams, which are smaller, don't need as much space, as say a larger breed of chicken. The short answer would be that six chickens would need a coop that’s at least 18 square foot and a run which is at least 90 square foot. So in total that would mean you’d need just under 110 square foot to keep six chickens. This is where your chickens will sleep and you need to make sure that each chicken has 10 inches of perching space. So in our example you would need a roosting pole which is 60 inches long (5 foot). For heavy breeds, like Barred Rocks or Buff Orpingtons, if you let your chickens out to forage during the day, then the coop that you put them in at night should have at least 4 square feet of space per bird. Thus, a 4′ by 8′ coop would be adequate for about 8 birds. If you keep your chickens confined to the coop at all times, then you should provide 10 square feet per bird. In this case, a 5′ by 10′ coop would be adequate for 5 birds. So if you have 6 chickens you will need around 90 square foot (6×15). This isn’t much land at all-a ten foot long by nine foot wide strip of grass would meet this. But, if you want to make your chickens happy, the more room you give them the better! This is where your chickens will sleep and you need to make sure that each chicken has 10 inches of perching space. So in our example you would need a roosting pole which is 60 inches long (5 foot). Inside a coop you will find the floor (which we cover with sawdust and straw) and a roosting/perching space. The actual chicken coop needs to be at least 3 square foot per chicken. So following on with our example of six chickens, the coop needs to be at least 18 square foot. This is where your chickens will sleep and you need to make sure that each chicken has 10 inches of perching space. So in our example you would need a roosting pole which is 60 inches long (5 foot). Get those babies out! Second, you need a minimum of 4 square feet of floor space in the coop per Large Fowl chicken and 10 sq ft of run space. The coop is just for night time-so if they must be kept indoors all day, they would have to have 10 sq ft of indoor coop space per bird. 1 Chickens need a minimum of 18 to 24 of head space above the perch. 2  Remember-they have to fly up there and you don't want them banging their heads each time they jump for the roost! 3  2”x2” boards with the edges rounded off may be used for bantam breeds. 4  LF do best roosting on the 4” side of a 2”x4” with rounded edges. How much space do the hens need? In the hen house (where the hens roost and lay eggs), chickens need no less than 2 square feet per bird. In the run (where they play), hens need no less than 4 square feet per bird. If you have the room, feel free to give your hens as much space as you can. The more space they have in the run, the happier they will be. Making Room. A chicken needs enough room both inside and outside the henhouse. Figure on at least 4 square feet of floor space inside the henhouse for each chicken. Add 4 square feet outdoors. If you're raising, say, three chickens, that's a 12-square-foot henhouse floor and an outdoor chicken run of 12 square feet
http://smallfarm.about.com/od/designingandplanning/a/chickencoop.htm http://www.answers.com/Q/How_much_room_do_chickens_need_in_a_coop http://www.thehappychickencoop.com/how-much-room-do-chickens-need/ http://blog.mcmurrayhatchery.com/2011/08/02/how-much-space-do-my-chickens-need/ http://www.thehappychickencoop.com/how-much-room-do-chickens-need/ http://www.thehappychickencoop.com/how-much-room-do-chickens-need/ http://naturalchickenkeeping.blogspot.com/2013/04/how-much-coop-and-run-space-do-i-need.html http://ohlardy.com/a-practical-guide-to-keeping-chickens-the-scoop-on-the-coop/ http://www.ehow.com/info_8664353_much-space-one-chicken-need.html
how much room does a chicken need in coop