I do NOT have a walk in coop and am very happy with it 1+ year later. I built for 4 hens. 1 went Roo on me. The girls have 24-7 access to the run. The coop has all sweet pdz flooring (pine chips in the nest boxes). It gets scooped like a litter box each day or so with a more thorough complete sifting a couple times a year.
This presents no back challenges as the chickens do not have access to under the coop.
I have a 6 hen limit by township ordinance ... so my chicken math is capped. Still you do have to think long-term. Are you planning on culling older hens? Are you going to mind when their production drops? Will you replace any that die? How will you safely replace and integrate them? Can you handle some place to isolate a sick hen?
Bigger walk-in coops can make those question easier, but they can still be managed, depending on your goals.
After one of my hens died, I'm planning on adding two more. That will be my plan moving forward, replace with 2 when I'm down to 2. I'll let older ones live out their lives as practical. I'm planning on building a sort of hoop tractor coop for isolating prior to integrating any new birds. But, lots of other things have interrupted that project.
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