Your chicks should be really happy in your lovely space you are building for them, Susan! I'm not showing my chickens or they'll be jealous.
You'll just have to keep space in mind if chicken math sets in and your 5 turns into 10 or 15 or 20.
I started with 3 layers, now have 17 after processing some of my extra cockerels.
When I wrote about replacing layers every 2 years, that's what some people do to get the maximum feed-to-egg conversion ratio. Since layer hens often slow down after their second year, it cuts into profits and it's better financially to get younger, high production hens or your profit goes down. Nothing that I've ever done or worried about, since my flock is just a hobby, but important to some others. My 4-year-old ladies still give me 2-3 eggs a week each, and I'm OK with that. Plus, they teach the cockerels manners by beating them up when they become obnoxious teenagers. Priceless in my book.
Also, you have to go by floor space in a coop, not cubic feet. Unless you have multiple floors, the height of a space doesn't matter since most homeowners don't stack chickens up on top of each other. So 4 x 4 is functionally 16 square feet, and should be used for space calculations.


When I wrote about replacing layers every 2 years, that's what some people do to get the maximum feed-to-egg conversion ratio. Since layer hens often slow down after their second year, it cuts into profits and it's better financially to get younger, high production hens or your profit goes down. Nothing that I've ever done or worried about, since my flock is just a hobby, but important to some others. My 4-year-old ladies still give me 2-3 eggs a week each, and I'm OK with that. Plus, they teach the cockerels manners by beating them up when they become obnoxious teenagers. Priceless in my book.
Also, you have to go by floor space in a coop, not cubic feet. Unless you have multiple floors, the height of a space doesn't matter since most homeowners don't stack chickens up on top of each other. So 4 x 4 is functionally 16 square feet, and should be used for space calculations.