The US broadly does not have residential building codes; that's a job that is generally left to the States. And some States have not elected to enact building

The US broadly does not have residential building codes; that's a job that is generally left to the States. And some States have not elected to enact building codes, leaving that responsibility for bodies like cities and counties. And some cities and counties within those states have also not enacted building codes, or they might even do their own thing. So, it's largely impossible to generalize a thing like that in the US, where we've got 50 different states, ~3,000 counties within those states, and nearly innumerable cities within those counties. A person in Chicago, Illinois (home of the Great Chicago Fire) will have a very different set of rules in their area than a person in Meigs County, Ohio (which is approximately "what rules?") would.