We have the coop and roofed run on an old building foundation, concrete, with a concrete floor that's cracked but usable. It started as a shed coop with a chicken wire run attached, on the 14' x 24' foundation, years ago. Now, it's a roofed structure (shingles) with part of the south and east sides covered in hardware cloth and 2" x 4' woven wire, and vinyl sheeting in winter. So, a coop/ run combination, with five 'rooms' that can be opened or closed off, depending. It's not how we would have built new, but it's grown, and works well.
Mary
Mary