I have the same situation. Yes you might get a few but eventually I've found that you will thin them out quite a bit. I've had feral cats,racoons,opposums even had otters take ducks on the water. The only predator that I've not been able to deal with is horned owls.
Scratch! Just went went with 8×12. 8 ft high. 6.2 doors,tired of scratching my head. 6 extended nesting boxes,maximizing interior room. 3 6ft perches,2×4 and must have poop boxes under.
Be there 1st nite in. Hope they like it. Still have to remove old coop and cover remaining top.
Started this project about 8 days ago.
Had to! Chicken math and my wife.
She,we bought 11 hens 1 rooster last March. Ok quick build was a 8×8 Hoop coop with a 15×15 run. Worked pretty good,for little while. Sister in law gave her another hen. Ok. Then another rooster. Then local feed store had...
Ok chicken math kicked in. Girls,not the original 11. But other 12 that magically appeared. Out grew thev8×8 hoop coop. 6ft clearance. I'm 6.1 with scabs on my head. Forget to duck.
New coop off the ground 12×8.
8ft ceilings.😁 6 nesting boxes. So one 12ft side completely open for perches and...
Ok started new coop today. My Wife and chicken math. Started a year ago will 11.
So built a hoop coop. 8×8. Thing we're good back then. Now the math kicked in. One year later up to 25 girls. 8×8 like doing hard time for those girls.
So new one is going to be 9×12. Off the ground.Not set on roof...