I live in N. Michigan and am building a new coop for my new batch of birds (expanding from 6 birds to around 120 this year- that chicken math you heard about starts with addition and goes straight to multiplication). Anyway, there are plenty of you who will probably BAWK at this, I currently have 5 hens and 1 roo who reside in a small coop that is only 2ft x 4ft. Yes I know! Anyway, my husband works 12 hours shifts with a one hour commute in either direction and winter was closing in fast!
So, I set to work to make a temporary coop that oculd house the then girls, until this spring when we make our MUCH, MUCH, MUCH larger chicken barn.
Our chickens and rooster are let out as soon as we get up (sometimes as early as 7 am when my husband gets home, sometimes not until 10am). And they put themselves inside at night when it gets dark and I go and shut it when I do the evening chores. We haven't had any trouble with fighting at all! I hang a bird feeder inside the coop on a finishing nail to sustain them until they get let out and the 2 nest boxes are on the exterior. They have a 2x4 roost that sits about 1ft off the ground as the coop is roughly 3 ft high, but all of them manage to fit across it. It does have a window too.
My point is with the right birds (good temperments), and all the necessities; nests, windows, ventilaton, roosts and good deep bedding! Your birds can definately be kept in your current coop. Especially, if you are aready making plans to expland/build additional coops.
My chickens are happy, healthy, and have access to our entire property when theycompletely free-range throughout the day, weather permitting! (Yes, they spent a handlful of days this winter only in the coop). This winter was particulary bad, with very low temps and nasty drifts, but my birds were warm and cozy, and happy!
Good luck on your chicken venture, we all have to start somewhere and all learn from our mistakes-even if they are too many birds in "too small" a space.