I have 2 16x20 covered pens between them I have an 8x20 it housed 3 quail and 25-30 chickens. Been empty for 15 years so I decide to get back into chickens and have turkeys no quail....I am building another 14x14 and a row that is 18 x30 and I'm planning on keeping 6 turkeys and 50 chickens.....and I can use horse stalls to brood in I have 6 of those 12x18 of course sometimes they do have horses in them I do believe that you can never have enough space because 2 months ago I was only planning on having 30 chickens no turkeys and we are building tractors planning on using electric web to let our birds roam. Birds love the space you will love extra space because it makes taking care of them easier. When my pens were not used by birds they acquired truck parts and tires and rims those were easy to get rid of....