As the chicks will need to pretty much full size before physically integrating them with the adult flock, I would use the same sq ft as you are comfortable with for your adult chickens.I have a brooder area that is about 2' 6" by 5'. I am hoping to use this for my smaller chicks but I am hoping to do batches of 10-20 chicks at a time. I know I need to raise them to about 8 weeks old before introducing them to the rest of my flock but I know they will need more space before that time so I am thinking of making a separate run and coop that runs along my current chicken run and coop so they can get acquainted though the fence. How much space is recommended for an 8 week old chick both inside the coop and in an outside run?
My first batch of chicks I got 24 chicks and they were ok in the smaller area until about 4 weeks old and then they seemed to be getting restless and like they wanted more room. I know I spoil my girls but I would rather them be happy and not picking on each other if possible. Plus I would like to let my hens brood out some chicks and don't want my mamas to get too restless in that small area for very long. For my main coop and run I used the rule of thumb of 4 sq ft inside the coop per chicken and 10 sq ft outside per chicken. Any size suggestions for the smaller coop and run?
Here is a picture of the small brooder (the little area under the bench):