The top part of the windows that opens are 18 x 11 inches that open fully. The roof vents are on the walls facing west and east, and those are 8 x 8 inches. The domes on top are just mini sky lights. We were thinking about trying to make them into vents but worry about rain coming in. We can get either a ton of snow or not too much. It can get to zero but it's mostly wind chill that affects us here. The doors have large-ish windows that are towards the top of the door and those face east. Should we take the plastic out of those and put hard cloth? I got my chicks late and they are going to be 6 weeks old this Sunday. On top of that, we are already hitting 45 degree weather and some nights down to 30. I just want to make sure they transfer into our coop safely this early winter!
Your "roof vents" are gable vents (a ridge vent would be more in line with a roof vent, or there's actual roof vents that stick up from the roof to allow for ventilation) and provide just under 0.5 sq ft of ventilation.
The 2 windows provide another 2.75 sq ft of ventilation.
With 7 birds you should have around 7 sq ft of vents, and you're at a little under half that.
The windows in the doors could be additional ventilation but depending on your wind directions opening those up may or may not be advisable.
On the plus side, what you do have going for you is a lot of air volume inside the shed, due to height and overall floor space, so while the chicks are young you'll probably be ok with ventilation as it stands, however a good spring project would be to not only add more ventilation, but add enough to accommodate any future birds you might want to add + extra (i.e. if your goal is 10 birds total, add enough for 15).
Wind chill should not be an issue as the birds have 4 solid walls to blunt winds.
And yes I didn't catch that the top roost (assuming that's the top roost) was so close to the walls. Roosts should sit at least 12" from walls and 14-16" minimum away from one another.
