Physics: What size do I need Henhouse?

B & B's large chicken coops for sale on: query : What size chicken coop do I need to have I want to create my personal chicken coop and 10 chickens, but I want to open my horizons and maybe in a few years, 20 chickens, who knows! Some choices need to have far more cooperation? All the houses I've observed for sale are little and are not flat, but are extremely comprehensive, anyone of you knows a web site that is to sell more chicken coops, or even a internet site with far more chicken coop

Building a Chicken Coop