Ladder or not may depend on your breeds. When we built the big coop I had a Brahma whose "flying" -- that is, wing-assisted leap -- capability was about a max height of 18" when POWERFULLY motivated by the thought that someone else was getting a treat she wasn't sharing in.
Currently, I have a California White who periodically sleeps 14 feet up in the roof structure (though a night spent out in a thunderstorm *may* have convinced her to sleep inside the coop for now).
Currently, I have a California White who periodically sleeps 14 feet up in the roof structure (though a night spent out in a thunderstorm *may* have convinced her to sleep inside the coop for now).