Welcome to BYC! Yes, we are all finally thawing out from the Polar Vortex! Snow is finally melting, the -12F (-36F windchill) here is history.
Here are some pics of my coop (similar in sq ft space to yours, but tallest point is only 8ft high inside). Lots of ventilation in ours, but less in winter to protect from the really cold winds, but still quite a lot for the flock. This was build stage last spring.
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Ladder roosts inside on a hinge, so they can be lifted for easier cleaning. Birds were 4 months here. We had up to 21 in here, including younger 5 months chicks before we sold some. They did fine, I think because they can get away from each other fairly well. We are considering adding a fixed roost at the very back, higher than the current top roost, attached to the studs, and twould be able to choose that as well.
Here are 21 of them in this space, including 2 cockerels. We have since sold 9 of them, including 1 cockerel, leaving us with 12 chickens (and only 1 cockerel). Note, there are still 2 lower roosts that the birds could use, but of course they all like to be as high as possible. The female Jersey Giant (bottom right, very large pullet) does like her space, so is usually not crammed in with the others, whereas the male Jersey Giant doesn't seem to mind being crammed in (he is middle top, blocked by the SLW that is standing). The 4.5 month old chicks are, as expected, working their way up the pecking order and are roosting on the second highest roost ... an improvement from the month before when the flock relegated them to pretty much the bottom roost!
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Yes, planning on getting some more chicks this year, but we can either send to freezer camp or sell at livestock auction the ones we don't want. We will have extra males because I have some straight runs coming, and will need to get rid of the ones we don't want to keep one way or the other.