Water and Feed Availability
Counting the size of the chicken coop, plan on having a couple of water and feed sites that are easily available In order to avoid too high of a humidity it's in reality better to keep the water feeders outside the coop. At Last, be sure that the height of the feeder is appropriate for the
chicken breeds you are putting up, so that there is no scramble to get food when wanted.
Ventilation
Finally, the last thing you will need to keep in mind is the ventilating system you are providing for the birds. As brought up briefly above, the chickens will need a great source of air flow to bring in extra oxygen and remove ammonia or carbon dioxide.
One way to check if there is sufficient ventilation is if you don't notice any moistness inside the coop. In most cases a small vent on the side of the chicken house will be sufficient. Don't forget good forms of insulations. In order to keep drafts at a minimum attempt not to set the vent on the side that typically gets the most wind in your area.
Watch those factors when you determine where to position your chicken house. That way you will be able to have the healthiest chickens possible and more importantly, once designed right you don't have to make any future adjustment to your chicken house.