"They might be destined to be renters for life which is likely to have an impact on net savings for this group in New Zealand in years to come."
Veda's data on all mortgage inquiries to August 31 showed 11 months of decreasing mortgage inquiry volumes this year.
Across all age groups, inquiries were down by 30.02 per cent last month compared with August last year, and down 13.74 per cent for the three months to August compared with the same period last year.
This was the largest drop in mortgage inquiries since LVR restrictions were first introduced in October 2013, Mr Roberts said.
In contrast, Gen Y's personal loan and credit card inquiries for the period were strong.
The rate of increase for personal loan inquiries from Gen Y in the August quarter, compared with the same period last year, was 12.10 per cent.
The rate of increase of credit card inquiries by Gen Y in the August quarter was 19.66 per cent compared with the same period last year.
"Potentially this could indicate a major structural change to the New Zealand economy as has played out in other jurisdictions such as Europe," Mr Roberts said.
"Gen Y may be showing a similar pattern to that of baby boomers prior to the 1987 downturn when consumer spending was fuelled by unsecured borrowing."