I do not think that the coop is going to be big enough for 5 chickens regardless of how big the run is. The chickens have to go in the coop in bad weather and at night and they do not need to be cramped. When it's rainy, the run becomes useless unless it is covered. And I will tell you, if a company sells a chicken coop and says that it will hold 4 chickens, chances are it will only hold 3 if you are lucky. I've seen people trying to sell large chicken coops that will "hold 25 chickens!" that I would only put 10 chickens in. What I recommend for you to do is to make the run sturdy and cover it in tin, a tarp, or something else that will keep the rain out. If you will do that, it may be big enough for all 5 of your chickens.
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