Last time I used a big, metal stock tank like they do in the farm supply stores. They have plenty of room to move around and get away from the heat source if they get too hot, and they aren't able to fly out of it until they're at least a few weeks old. They don't have corners to pile up in, either. I've also put a metal rim from a tractor tire in my coop (no other birds in there at the time) with a light over that and food and water of course, but that was for a smaller amount of chickens.
I think a brooder can be as much or as little as you want it to be. As long as they're protected from drafts and predators, have heat,(yet enough room to get away from the heat), water and food, I think they're good to go. Heck, I've even brooded chicks in a cardboard box for a week in my laundry room with a clamp-on lamp for heat and they did just fine. Why in my house? Just for the enjoyment of being able to peek in on them and watch them. I also enjoy watching them hatch - I've been known to sit up all night and watch chicks hatching... Sorry - I distracted myself!
I think a brooder can be as much or as little as you want it to be. As long as they're protected from drafts and predators, have heat,(yet enough room to get away from the heat), water and food, I think they're good to go. Heck, I've even brooded chicks in a cardboard box for a week in my laundry room with a clamp-on lamp for heat and they did just fine. Why in my house? Just for the enjoyment of being able to peek in on them and watch them. I also enjoy watching them hatch - I've been known to sit up all night and watch chicks hatching... Sorry - I distracted myself!

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