Husband and I built the nest boxes today. Well, he built them and I helped! Maybe went a little overboard using 3/4 " plywood but they will last! These measure 12x12x15(deep) and will mount to the wall of our coop, about 18-24" from the floor. We were a little short of plywood on the top to make it out to the top edge of the box; but there is no way the hens can roost on top or on that top corner that isn't covered.