I have 9 - 5 month old girls right now. But we are looking to get a few more in the Spring. (Chicken math, initially wanted 6, got 12 instead, 1 died, 2 roosters were re-homed, and now want a couple more breeds)
Our set-up includes a 5x6 coop with 2 - 6ft roosting bars. We have an automatic door that opens at dawn and closes just after dusk, so they are only in there to sleep. There is an attached run that is 10x12, but the door to the run stays open, so they free range all day. (the run is really only for when we need them to not be roaming, and they are usually only penned up for an hour or so, such as; when mowing the lawn)
I have read that most say your coop needs to be at least 4 square feet per chicken, but then I have read that some say that is only if they are kept in the coop for more than to sleep, and they are ok as long as they have at least 1 foot of roosting space. We would prefer to not need to get another coop, so I am curious if I need to wait until we do have enough money to get another coop, or if we will be ok to get a couple more girls.