I think it depends on what builders can get away with, or what they can't, and this is as much as about environmental considerations as legislative.
We live in an 'earthquake zone' and by the sea in Greece. Since 2004 the materials and building standards required are considerably higher than that I have seen in most of the UK properties I have owned as a result.
- All builds must have a reinforced concrete frame, including houses.
- Infilled - or bricked areas between the frame must have the bricks wired, akin to concrete reinforcement
- internally there are no stud walls, everything including interior partitions are wired brick
Additionally being by the sea there is no UPVC window framing, proper heavy duty aluminium extrusion only, and heavy plastic coated.
Our front door is a steel plastic coated security door, with multi locking points....
But I know full well that if these were not necessary or required, in order to build and sell, they would be built of cardboard instead....