I know the standard 3-4 and 10 sq ft per chicken coop and run. However, how much does chicken size come into it? Obviously bantys need less room as they are 1/3 to 1/4 the size of a standard chicken. Do you cut the size down to 1/3 to 1/4 the amount of space? What about if you have lighter breeds, like lakenvelders or campines? Could I estimate by weight? Could I fit 2 lakenvelders, a campine and an andalusian hen in the same space as two Orpingtons or two Brahmas? 16 pounds vs. 16 pounds. What size chicken is the space estimate based on - 6-7 pounds? I have three inter-nested coops/runs - the first is a set of wooden cages that the birds sleep/roost in (two banks of open front cages 8 feet long and two feet deep and high for a total of 32sq ft floor space. set up it's 8 ft L, 2 ft D and 4ft H. It sits on 8" cinder blocks. Each of the 2x8 banks has two 2x4 cages. Each cage has a 4 ft roost pole, raised one gallon waterer and hanging 3 lb feeder. These two banks are stacked on top of each other inside a 6x12 kennel fenced/covered run/coop that is attached to a side of a 450 sq ft fenced ranging area. In the 6x12 coop/run, there is additional horizontal square footage of about 32-48 sq ft due to stacking the cages, the space underneath for the smaller birds to hide and scratch and the cage roof which several like to perch/sleep on. So let's say that coop has 100 sq ft. total. That should be enough for up to 25 chickens - as long as they have regular access to the ranging area, right? I only plan on confing them in the fenced coop at night or if I'm going to be gone overnight somewhere and I can provide enough food and water for their needs while I'm gone. They have a 5 gallon waterer and a 22 pound feeder avialable, too. On longer trips I have someone let them out and in each day, check water, food, etc. Could I safely confine my 20 birds in the 6x12 kennel run (with the various cage levels giving extra sq feet for roosting and perching) for a day or two without causing undue stress like fighting or feather picking? I'd put something in like a flock block to divert attention. There are no issues right now as their night time sleeping place - in fact they all go into only a few of cages and a few onto the top of the cages, and leave one of the cages empty (farthest from the door). The most popular cage typically has six or seven hens bundled in their together with no issue. Right now they're not fully grown so they take up less room. My flock sizes range from light, white egg layers such as lakenvelder, campine, polish and andalusian, to medium layers like EEs, Marans, Welsummer, Blue Wyandotte, Barnevelder, to some heavies...a couple of Lavender Orpingtons and Brahmas. I'd hate to come home and find my flock beat up from space or boredom issues. Thoughts appreciated.