So when you breed chickens in pens....

[Chickengirl1304]

Do they have their own little house to sleep in at night or do they just sleep in the pen or cage?

 

[ChickensAreSweet]

If the pen is in a barn, then the pen might be ok by itself.

If the cage/pen is in the elements outside, the chickens will need shelter from the wind, rain, sun, cold, etc. and you would need a coop inside the pen.

Also it must be predator proof. Coops are best because they are tight against predators. 1/2 inch hardware cloth is the only way to go for coop window coverings.

Usual square foot recommendations on BYC are as follows: 4 square feet per chicken in coop PLUS 10 square feet per chicken in the pen.

More is better- they always like a larger pen. Free ranging is the greatest, in a chickens' eyes, but you loose some from predation.

 

[Mac14]

https://www.backyardchickens.com/t/695124/doghouse-now-a-chicken-house#post_9425901

I don't have a rooster but would this work?