I think originally our coop was built as a barn, because it has the typical wooden structure they used to put the hay for the cows here. However my partner's father has always seen it used as a coop, so the switch to using it as a coop must have been made before 1950. The door is very solid, but here many people have high roosts for their chickens, i've seen up to three meters high. In some places it may have been to protect them from ground predators.
Height wasn't a problem when my ex-batts were young, but now they fall off more often and they have trouble reaching the nests. But they all want to perch as high as possible, and they don't use the three nest boxes my partner built 40 cm above ground level. Habbits are hard to change.