That's something I wonder about with my flock too. We had no say in the design of our feed store custom pre-built coop and the roost bar was at the same level as the nestboxes. Plus the nestboxes were very secluded and chickens love seclusion. Every chicken that's added to our flock sleeps in the nestboxes with the older hens. We have only 3 nestboxes and at one time had up to 5 hens and they will double up to sleep in a box. Once found 4 in one box on a cold night! We are looking to replace our coop year after next and wonder if the hens will continue using the nestboxes or if the new higher perches would be utilized. We're calling Amish coop builders to get a customized coop quote because all standard coops we researched have the roosting bars narrow side up instead of flat side up. And what's up with windows in a coop where you have to go in every morning to open a window and every night to close it? ezcleancoops.com are the only coops I've seen that open from the outside but their perches are not flat. These companies make pretty coops but know nothing about chickens! I've been getting quotes and so far the only modification to an Amish style coop that would cost more are the windows that tilt open from outside instead of opening from inside. They'll even make the coop taller, wider, narrower, or longer or modify the nesting boxes and roosting bars at no extra cost. Shipping varies from company to company but basically in the end all cost within a couple hundred dollars of each other total. Finding a company willing to do on-site positioning of the coop varies from company to company too.