I live on a few acres and recently got 6 egg layers. They are being kept in a garage right now. I received a home made coop from someone that is pretty heavy duty. It has 12 sq feet with a separate nesting area (not included in the 12 sq feet). I plan on letting them out to run around the property occasionally but wont everyday. I plan on adding on to this coop to achieve the 4 sq feet per chicken. My question is....should I add on a run that is exposed to the outdoors or add on more interior coop? Is a run required if they get out a few days a week? Thanks for any advice.