I wouldn't go with the dirt floor myself because of rats and mice. They burrow and unless you lay hardware cloth under the dirt of your coop they could just burrow right into your coop eat your feed and leave their nasty droppings in there.We are in the process of designing and building a new coop for our flock of 20 birds. I see some coops that are raised off the ground with a wooden floor and some that have no other floor inside but the dirt itself and are built directly on the ground with only the four walls and the roof of course.
I will be using the deep litter method with pine shavings and would like to hear some comments and thoughts from others who have built a coop.
We live in West Virginia and the soil is mostly clay.
Any help and design ideas would be greatly appreciated.