My experience in this field is limited to this rather good UK TV series on Channel 38, Quest:
https://en.wikipedia.org/wiki/A_Plane_Is_Born
In this, the man from the ministry, with white coat and clipboard, was from the PFA. I gather this is not the factory but not really the government either. In the States, it will be different but possibly similar.
In this programme, limited plastics work was undertaken. But I find it impossible to believe that, in this tragic case, home builders would be allowed to tackle plastics work on the main principal structural areas.