I can’t overstate how much I appreciate all your considered responses, and am so glad I asked the question here!
I’ll move without delay to get a bigger house for my lovely chooks, and it is so great to get specific info. I wish I were handy enough to make it myself but I’ll the specifications to make sure the next house is more suitable. (I’m already thinking of how I’ll paint it up! )
I’ll hold onto this one too - or if I sell on advise the new owner better on how many chickens it should hold.
Thanks everyone!