Oh, yes. We learned that rule the hard way, too.
I built my coop in the garage, changed my mind about where I wanted to put it, realized it was too wide to squeeze throught the fence gate, had to take a panel off the fence, and just barely managed to squeak it though with only about a quarter of an inch clearance (if that) on both sides. Plus my husband and I just barely escaped hernias.
Yup. Good rule.