8. How much space is needed for individual Pens. How big should a coop be for 6 chickens The Best Large Chicken Coop In terms of roaming, each chicken, at a minimum, will require 15 square feet. It is one of the oldest breeds of chicken in the world. In commercial chicken operations, the long chicken houses hold thousands and thousands of birds; in broiler roaster programs there may be as many as 20,000 chickens in a. 5 pounds of feed for every dozen eggs they lay. tube feeders 33 chickens. . In 2018, there were some 23. Pine shavings are recommended for floor litter, and many farms use a deep litter method. . Gail Damerow has written numerous books about poultry, including The Chicken Encyclopedia.