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I’ll have to look into that! While I was going through reviews I saw this expansion someone did. I think once I make that expansion, I can expand the coop as well.
Might want to think bigger - not just for the chickens, but also for you as the caretaker.
Maybe you don't have back issues, but I sure do. A chicken run that isn't tall enough to stand upright in makes for difficult maintenance, and almost impossible chicken catching.
Assuming you don't want to build your own, a dog kennel kit with modifications can work as a base unit for a run (minimum modifications would include addition of hardware cloth around the bottom few feet, and possibly netting over the top). For 3-4 chickens (and to make it easy) I'd get a 10x10 kennel, and simply put the modified coop inside it. That will meet your space needs and be much easier to maintain.