New Zealand uses cheap Chinese and foreign labor, not much is certified in the country, the government runs a scam
Their pre-historic homes, not much is certified in this country, like the Christchurch earthquake, the country, is built on poor foundations, and much of the work done in this country, was a substitute for the real thing. The government employs people without much accreditation and builds on robbing the people for their land and homes.
Unlike more modern countries, they are using cheap labor and much of this is uncertified. You spend millions for a pre-historic home in New Zealand, chances are it was certified in the 1930s.