No, I have mine 6 inches from the floor. I nailed a couple 2 x 4's between the studs, to make it wider for them to walk over, instead of just the wood siding. Hope that makes sense, I don't have a picture.
If you have good ventilation but not drafty on your chickens they will be fine. A dry cold coop is much better than a smaller warm humid coop.
When you cut out your poop door, make sure you have it 6 - 8 inches above your floor. This will help keep your bedding in the coop when they go in &...