Could it be as simple as money being funneled through NZ nationals to buy up houses?

I mean housing prices are up everywhere it seems, one could think there's an evil shadowy cabal of rich investors buying up properties.

But, and I'm not an economist or anything here, on the other hand there's a few forces pushing average people to it; we've recovered from the housing crisis from 2008 onwards. Savings account interests are on the floor, so people are looking to put their money somewhere else - a house is a great long term investment.

another one I heard is that "big" loans from e.g. the European Central Bank are really low interest, pushing banks to lower mortgage rates, which makes people think "now is the time to buy and fix my mortgage rate", which is what I ended up doing a few years ago.

And of course there's the 'rona, which has made a lot of well-off people reconsider their overpriced living conditions in the big cities. They can get a real house outside of the big cities for the money they make, and if they can work remote or limit commuting, it makes sense.