Okay thanks. I have six chickens already in a coop but I want to expand my flock next spring to like 20-25 birds.
With expanding to the 20-25 birds you need a coop 8x14 or larger and a run that is a minimum of 250 square feet or roughly 14x20.
Going with 20+ birds......don't look at premade coops. They cost a ton, are poorly designed, poorly made and cannot come anywhere close to meeting your needs.