There was a sharp jump in the number of households living in rented accommodation in the 12 months to September, according to Ministry of Business Innovation and Employment (MBIE) figures
MBIE collects the bonds that are lodged with new tenancy agreements and holds them until they are refunded when the tenancy is terminated.
At the end of September it was holding 413,481 active bonds, an increase of 15,297 compared with the 398,184 bonds it held at the end of September last year.
Just over 44% of the increase in tenancies occurred in the Auckland region where the number of bonds held by MBIE at the end of September was 143,397, up 6081 compared with September last year.
Nationally the figures represent a return to the normal tenancy growth patterns after two years of low growth.
Between September 2009 and September 2010 the number of bonds held by MBIE increased by 13,467 and the following year they were up by 14,547.
But growth fell back the following year.
At the end of September 2012 the number of bonds held had increased by 7,041 compared with a year earlier and in September 2013 the increase fell away even further to just 1,917.
In Auckland, which is the country's largest rental market by far, the number of bonds held in September 2013 was up by just 741 compared with a year earlier.
The big increase in bond numbers in Auckland over the last year is likely to be a result of the region's high population growth, particularly from immigration, which has stimulated demand for rental properties and reduced vacancy levels, and increased activity from investors as they buy or develop additional properties to satisfy that demand.
However the bond figures do not capture all residential properties that are rented.
According to census data, there are many more households living in properties they are renting than the bond figures suggest, although the gap between the two is narrowing.
The 1996 census recorded 290,124 households that were paying rent to live in dwellings they didn't own but the MBIE was only holding 157,953 active bonds in the same month that the census was carried out.
That meant the rental figures identified in the census were 84% higher than the bond figures.
The difference could be made up of vacant properties, which would not appear in the bond figures, or situations where someone had purchased a property as an investment and rented it to a family member for a nominal or below market rent and without formalising the arrangement by filling out a tenancy agreement and collecting a bond.
There will also be some cases where landlords operate outside of the law and fail to forward bonds to MBIE.
However the difference between the number of bonds held by MBIE and the number of households identified in the census as renting has been steadily declining.
In the 2001 census the number of renters was 60% higher than the number of bonds held, in the 2006 census it was 28% higher and in the 2013 census it was just 16% higher.
If we assume that the total number of rentals is currently say, 15% higher than the number of bonds held by MBIE, it would mean that the adjusted number of rented properties increased by 17,592 between September 2013 and September 2014.
In Auckland the adjusted number of rented properties would have increased by 7,821 over the same period.
According to the Real Estate Institute of NZ, 72,877 homes were sold in the year to September, with 28,370 of those in Auckland.
If investors were buying properties at the same rate that the adjusted numbers of rental properties have been increasing by, it would mean that investors accounted for 24.1% of all sales handled by REINZ members in the year to September, and 27.5% of sales in Auckland.
The actual number of sales to investors is probably slightly less than that because some investors are also developers who increase the number of properties they own by subdividing existing ones or converting commercial buildings to residential use or by building new units from scratch.
When the developer/investor keeps those new units to rent them out, they won't show up in the REINZ figures but they will show up in the bond figures when the properties are tenanted.
But overall, the figures suggest that around a quarter of property sales in Auckland over the last 12 months could have been to investors while nationally it may have been somewhere between 20% and 24%.
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