Those are nice and low down.This is how I set up my roosts...I didn't want to have them too high! When we had our Banty's I had the roost up where the ceiling starts to slope, but I knew these girls would be too heavy for that and I didn't want anyone to get hurt!
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My design issue was the hill the Palace is built on. There is a 2' drop from one side to the other. If I had the roost on the ground at one end it would be 2' high at the other end. Of course I could step it down in the middle - but then I think the chickens would think the lower step was lower even if it was the same distance from the ground.
When I first joined BYC I actually posted this as a question - do chickens decide height by distance from the ground or absolute level. It is unclear. But as soon as I committed to a single roost all at one 'height' then for sure the down-hill end was going to be at least 2' off the ground.
In the end I went with it at a height that was the same as the minimum horizontal distance from a wall - which is what several folk had said chickens need to fly down. @Shadrach's experience is that they need way more horizontal distance.
As it turned out, they just don't jump down at all.
Here is the original thread where I was trying to understand how chickens judge height: https://www.backyardchickens.com/threads/coop-on-a-hillside-roost-heights.1338548/