I built a very simple A frame structure that abuts my coop door. I built it about 9-10 years ago when I was having problems with overhead predators. In the spring I was having issues with Ravens, Eagles, Hawks & Owls!! I would keep my girls confined to this little run while I was at work & then open it up in the afternoon when I got home from work.
I have an automatic door on a photo sensor so it would open & let them into the A-frame run. There is a door on the far side of the a-frame that I could open or close depending on the circumstances. I have not had overhead problems in the last few years so I rarely close the A-frame door but it now acts as an outdoor covered run. the girls really like it in the winter, it gives them a dry dusting area out of the rains.
I built it in 2, 5'sections covered with poultry wire. Their run is safe from most predators so the goal was just to protect from overhead predators. When the rains started in the fall I covered it with a tarp to give them a dry area outside to dust & hang out. It was a very simple afternoon build, I cannot believe it is still standing!
This was one of the best additions that I have made to expand my tiny little coop.