I used local builder for this 6x6 walk in coop with 6x6 covered run. Finished inside with help of friends (remnant sheet vinyl covered in shavings-east to clean, one wall with painted mural, 2x4 roosts above poop board, nesting boxes below roost/poop board). Goal was: easy to clean, secure, walk in, able to move if needed, suitable for cold winters. I know some folks have the skill and tools to build their own, it was not an option for me. This worked out well for my backyard flock of 9, located in Wisconsin.
The chickens spend most of the day in the fenced in backyard otherwise I would have asked for a larger run.