The brooder barns were the best things we ever built. I would suggest multiple sizes to accommodate various ages and sizes. We brood chicks to two weeks in shallow 75 gallon rubbermaid containers with wire tops. They then go in 36" x 36"sections for two weeks, the into 36" x60" sections for two weeks and then into 48" x 60" or 54" x 72" sections for 4 weeks. We use 1/2" by 1/2" wire floors (get coated wire if you can but galvanized works fine and we have never had hurt feet on it).