@Alibabe and @lazy gardenerAlibabe: if hubby is saying that the run is too small... I'd listen to him... and I'd follow that up with a conversation with him... encouraging him to decide that the coop needs to be bigger too. If my hubby so much as suggested that anything related to my "farming" was too small, I'd take it and run with it so very fast that he'd wonder if a tornado just passed through!
I agree. I'd let him build it as large as he'd make. You will NEVER be sorry for having too much space because there IS NO SUCH THING AS TOO MUCH SPACE.
Most people also end up fining that they want more birds than they originally thought so if you're in the building process I'd say to plan for at least double what you are not thinking if you can. More if possible.
You'll never regret that.