I'm brand new here - so be gentle I'm getting chicks the first week of June (in New England, just all around safer that way no?). I have a Wyandotte, polish, lakenvelder, and 3 bantams (1 EE and two "assorted") on their way. I'm in process of planning and building the run and house. So - let me ask:
I was planning on a 4x4 coop 4 feet tall in the front, peaking at 5 feet tall and then down to 3 for the back wall (think modified saltbox design), external nest boxed with liftable lid, and roost along one side over the nest box entrances (so about 48" roost length). Poop board 2 feet up, 6 inches above that the roost. Ventilation being 2 30x14 basement storm widows on the front, one on the side opposite the roost and nest boxes, covered in hardware cloth (and to be closed with the storm windows when it starts getting cold, and permanently open soffits along the front eaves. Probably also a permanently open heater-vent covered vents on each of the sides as high up as they'll fit. That would make the roost almost 2 feet below the top vents, and 18 inches below the soffit (of course, just at the one end). It will also be elevated from about 6" to a little over 2 feet off the ground (New England! Nothing is flat here).
They will have complete access to a 16x8 predator-resistant run all day - and night if they wanted it.
My question - is what I am planning large enough for these birds? I know all except the Wyandotte are on the smaller size, so I didn't know if I would be ok with a 4x4 footprint and 4ft roost.
I'll have lots of follow ups I'm sure, but I've already typed too much - if you're still awake reading this, then I'd appreciate any insights you may give!