If you have cold winters you'll want to insulate the coop.
I made my coop a little bigger since I have cold winters since I figured they would be staying inside when the snow is to much for them and I don't want them feeling cooped up. You can see my coop on my page (I have 4 hens) https://www.backyardchickens.com/web/viewblog.php?id=9429
The only reason I raised my coop off the ground was for ease of cleaning, I don't have to bend over.
I made my coop a little bigger since I have cold winters since I figured they would be staying inside when the snow is to much for them and I don't want them feeling cooped up. You can see my coop on my page (I have 4 hens) https://www.backyardchickens.com/web/viewblog.php?id=9429
The only reason I raised my coop off the ground was for ease of cleaning, I don't have to bend over.