How much space you have should determine how many chickens to own. A small family can supply themselves with their own fresh eggs from a relatively small back yard. To have healthy hens for eggs means giving them an adequate environment. Most of this can be accomplished with just a few rules in mind.
Large fowl breeds need at least 4 square feet of space per bird provided they are let out to forage during the day. So, a 4’ by 8’ coop would be adequate for about 8 birds. On the other hand, if they are always confined, then each bird would need 10 square feet. So, a 5′ by 10′ coop would be adequate space for 5 birds.
Chickens will be happier and healthier if they are let out during the day with
supervision to forage. At night, they need protection against predators, so they should be kept in a chicken coop or shelter. The proper size of the coop depends on how many birds you have, what size they are, and whether you let them out to forage during the day or keep them confined to the coop.