So I have 25 ISA browns (pullets) coming as day olds on June 2nd. Static Chicken Run is 30ftx30ft (still needs to be covered with wire mesh)... Coop is being build by my FIL... 10x12 with 10x8 being used for the chickens...leaving me 4x10 for supplies, room to move etc. My question is how big of a brooder will I need for 25 chicks.... I am expecting losses and I would like to end up with 12-15 laying hens at the very worst . 25 at best As the summer progresses I am going build 3 more runs so I can alternate the birds through the runs every 2nd day. Since my wife has a bird phobia I have had to design and build everything so that she can take care of the birds without ever touching them if she has to...(feed, change water, and get them to thier runs)... That is once they get large enough to go into the coop and use the runs.. She wont have to do this very often, mebbe once or twice a year..but it will end up happening eventually (murphy's law) I have about 200 rabbit type cages that were left by the previous owner so I had thought about dismantling a few and building a large cage out of 2-or 3. What kind of sq ft-age do I need for a brooder.