It is, but you can make it a little nicer by giving them plenty of stuff to scratch in: maybe a giant pile of dead leaves, or a few bales of hay or straw, or if you have a compost pile you could dump it all in there for them to scratch around and eat bugs.
And if they are free to go out and...
Do you mean they would have access to a coop and run?
Or do you mean they could also go in and out to free range?
Because if they can go out to range, a cat or fox or raccoon could come in at night to eat them, too.