Simplicity KiwiSaver is offering mortgages for first home buyers.  

https://www.stuff.co.nz/business/116236912/simplicity-takes-on-banks-with-295-per-cent-mortgages-for-first-home-buyers

If I was considering a first home in future I would put some money into Simplicity.  And will suggest to my step son.

I have Simplicity Kiwi Saver, and investment fund.  Hopefully they can extend the offer to other loans in future.