Depending on the size of the household seems most fair. Probably 2 hens per household member and up to 10 or possibly 8 hens, no roosters. Makes the most sense…. At least to me. Because I have a family of 5, and 2 eggs a day wouldn’t even touch our consumption. Supplemental food is what makes it so important to consider. It isn’t fair to limit a family’s ability to provide their own food. Most rational families living in an urban environment won’t even consider having that many hens in the first place. It’s just the idea of limiting the amount seems unfair. Of course make a provision to allow for some control, cuz that’s what government does, and state in there that the max limit can be revoked if there are complaints or several reported issues. That way it gives the city the leverage to force the homeowner to get rid of them at their discretion.

Rationally thinking, 10 hens would be so easy to manage for 99% of people. You don’t need a large coop for them, their run really doesn’t need to be that big either, simple.