I have a hen house that has 2 nesting boxes and interior space of 20 sq ft (4 x 5) and two perches (they only use one). We were letting them out to free range all day and that worked great for 6 months until the hawks found us. We lost 2 birds so we are down to 8. This weekend we built an outdoor fenced in area to attach to the hen house. It is fenced on top and sides. Height is 6 feet and it has 104 sq ft floor. How many chickens will it happily hold? I close them up at night and open the door first thing in the morning. I know I can safely go back to 10 chicks but can I add more now that we have this enclosed outdoor space?