Hi only got 3 chickens, 2 cream legbar 1 buff Sussex. I'm in the west Midlands UK. Its going to be a window that is only open in the day it will be tightly sealed at night, yes there will be other ventilation when the roof goes on. The coop is 3x3x3.
Only a small one but my girls will love it! More room in this coop. Just got to get the panels round the run in the next couple of days. I'll take more pics when panels are up.