The number of houses for sale in Auckland has almost halved since the peak of the property market, and in 16 regions across New Zealand sellers have the upper hand due to a lack of listings.
"That's why we've seen such a spike in auction listings during June and July because the industry was well aware the shortage was coming and they started to advise their sellers their recommendation is to put a property to auction."
Helm said auctions were good for liquidity in the market, but did preclude some buyers.
"It really does benefit those who are cashed up but is hard for those who would like to buy a house but have their own property on the market and therefore can't really go unconditional and can't really afford a deposit," he said.
Helm said he expected the trend for putting properties to auction to continue while listings remained right.
"You have a good steady rise in sales, a pretty weak number of new listings, available inventory going down therefore buyers don't have much to choose from so if they want to buy they are going to have to bid with each other to get what they want.