We put our boys in a bunk recently. They are 4.5 and 1.5. DF built it and DS2 can't climb up the top. It was the only way we could fit a single bed in for DS1.
This is what it looks like..
Ignore the mess please. Also it was time for DS2'S nap. I took the photo for DF who asked me to.
"Insert witty signature here"