The cost factor is possibly higher in New Zealand where the cost of new builds is comparatively high. However, the long-term economics of warm, dry and sustainably built homes are undeniable. Most existing New Zealand homes only achieve a two or three rating, and new homes – even though they're built to the Building Code - will only achieve three or four. Along with Governments and local authorities around the world, banks have also been working to encourage both corporates and home owners to invest in healthier and more sustainable homes. Most existing New Zealand homes only achieve a two or three rating.

Source: Stuff April 12, 2019 06:56 UTC