Not the person you’re asking this from but as a Finn who watches a lot of construction related videos on YouTube I too get the feeling that houses in the US are built to a lower standard than here. It’s not so much that the materials are worse quality but more that the building code is much stricter here.
I’m a plumber by trade so my area of expertise is quite narrow but couple things that come to mind is how copper pipes are often soldered in the US where as here they’re always brazed which is a much stronger joint. We also don’t allow any connections to be made inside walls but in the US they’re common. Toilets there also tend to clog up quite often because of the way they operate which almost never happens here. Another thing I’ve noticed is that in the US they use a lot of wood and plywood even on bigger structures which poses a fire hazard as well as there doesn’t seem to be as much thought put into the insulation and vapor barriers.
in the US they use a lot of wood and plywood even on bigger structures which poses a fire hazard
they are a HUGE fire hazard and are nominally illegal except for a convenient loophole, as long as you claim you’ll be adding automatic sprinklers, you can sidestep a lot of the fire safety permitting – now they just burn down during construction before the fire systems have been installed …