I recently designed and built this portable chicken pen, or "chicken tractor" as some call them. I've seen many nice pen designs but this one is unique in many ways.

Here are a few of the design features:

The roost is in the house sheltered from the draft, yet it extends out away from the floor. Chicken waste is recycled into the yard instead of heaping up inside.

The roost is high enough off the ground and the floor to reduce the risk of carnivore attack.

Chickens can scratch in the yard during rain or shine.

Built of solid construction yet can be moved on level ground by one person.