New data out from the RBNZ allows us to look at how home loan borrowers use their houses as an ATM.
This data reveals the level of "mortgage top-ups" that are occurring.
Borrowers who already have a mortgage can go back to their bank and seek new borrowed money based on the existing real estate security the bank holds. This is colloquially referred to as a 'top-up'.
And we do that often, perhaps more often than is realised. In August alone, banks approved and disbursed more money to 6,338 borrowers. That is a lot when you know that in the same month, they issued new property loans to 6,774 borrowers.
However, 6,338 top-up loans is actually a modest number historically. In March 2017, there were 15,398 and in March 2021 there were 15,334 borrowers who got top-ups.

After the early pandemic surge, we have borrowed a lot less this way, partly as higher mortgage interest rate bit, and partly because lenders felt we were getting a bit carried away.
But those that kept borrowing this way, did so for larger amounts. The averages show that clearly.

It is no longer about a $70,000 top-up (a new car? a fancy holiday?), it is now a $100,000 project. So perhaps a pandemic home renovation?

This chart is actually not quite all it seems. To derive it we compared the number of building consents for 'residential alterations' to the total number of top-up home loans approved. There is a rough relationship, enough to suggest that house alterations might be a more dominant driver, but it isn't conclusive. The average consent value for alterations is about $80,000, but it has been for many years now and was that level in January 2017. And the number of alteration consents has been roughly stable too at 2500 over that same period. For the mortgage top-up averages to rise based on more alterations activity requires the other uses of mortgage top-ups to fall away, and we don't have direct confirmation of that. It is a presumption.
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