Does a chicken coop NEED a window? Do they need light in the coop... or could I sneak by with out it. I mean they will have an attached run. I just have to figure out if I can add a window with the idea I have. I'm planning on building my coop INSIDE my garage, with a dogrun OUTSIDE the garage for them to free range in. The coop will be Just a small box like coop, big enough for 4 chickens at most although I think i'll only get 2.