My chicken house is a little marginal size wise for my 12 pullets (50 sq ft). Right now it is not a problem as they are only 10 weeks old and have a outside run. My concern is this coming winter, it gets cold here often below 0 F and we are in a windy location. There are days when it is just not fit for man nor beast to be outside for long. As I have a tad over 6' of ceiling height I am toying with the idea of adding a second level in perhaps 1/2 of the space. This would allow me to enter the coop for feeding cleaning and such but would give the birds another 25 sq ft to spread out in on nasty days. The only down side I see is that they may treat the space as a roost since it would be higher than the roosts they are using.This would be a bad thing as it would be the equivalent of roosting on the floor and sitting in their own poop. Just wondering if anyone else has tried something like this and how it worked?