I have a coop that has the front entirely open to the run. The chickens don't seem to mind it. The only thought I have is that I worry when the wind picks up the bedding goes flying everywhere and the chickens don't have shelter except for huddling to the side. I have been considering putting a partial wall up just to help with the problem. It is always better to be totally prepared before you get them. Mine was finished AFTER I got them and still needs a few things done. Best wishes!