Hi everyone! Great forum! Anyone of out there raising a couple of dozens of chickens. i need some advice. First of all, how big should i make the coop for 20-25 chickens? I both want the chickens to have a optimal amound of space, but also to keep costs under control. as for keeping costs under control, any recommendations in general for building a sturdy, predator-proof, well-ventilated coop for less than $650? thanks!