I use a playpen in the basement. I wouldn't keep 12 in it past 2 weeks though. They should have room to exercise without bumping into a hatch mate.
I can raise 6 comfortably until week 6 in a playpen.

For winter I raise them in the basement until they are feathered out completely, then they go to the barn with a heat lamp until they are roughly 10 weeks old. It's -40F out with windchill.
I have a bunch of 9 week olds in the barn in a brooder I made, and more in our house in the basement. I've sworn off hatching until the end of February. At that time, chicks will go directly to the barn. I will be hatching upwards of 100 birds every other week. Maybe more. They will have a lot of huddle room to keep warm in addition to the heat lamps. They'll have a part of the barn that is currently used for sheep.
I can raise 6 comfortably until week 6 in a playpen.
For winter I raise them in the basement until they are feathered out completely, then they go to the barn with a heat lamp until they are roughly 10 weeks old. It's -40F out with windchill.
I have a bunch of 9 week olds in the barn in a brooder I made, and more in our house in the basement. I've sworn off hatching until the end of February. At that time, chicks will go directly to the barn. I will be hatching upwards of 100 birds every other week. Maybe more. They will have a lot of huddle room to keep warm in addition to the heat lamps. They'll have a part of the barn that is currently used for sheep.
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