I made nest boxes when we built our coop but I know for a fact they are too big. They are 14in x 16in and 12in high in the back and 6in high in the front. I only have two since I started with four hens. I am getting chicks in February and will need more than 2 nest boxes for 15 hens. What are the dimensions of your nest boxes? How high up do you put yous? Do you stack nest boxes on top of each other?