Well, if you're in an area that doesn't get snow or severe storm seasons, and therefore your birds would truly only ever be indoors to roost/lay, then you could probably get by with the 2 sq. ft of housing space that some use. But if you're in an area that does get winters, any situation where the birds might be indoors (by their choice or yours), then I'd suggest 4 sq. ft. min. for your housing. We don't get really bad winters in my area, but we do get snow. And although there's never been a day that I didn't open my pop door for my girls, there are weeks at a time when they spend a LOT more time indoors by choice. They'll go out, but they'll make frequent trips indoors to get out of the weather. My chickens do NOT like snow at all, and avoid it like the plague.