Their figures showed over 80 per cent of people looking for a house in the past week used an online specialist website to search for a property, whereas about 45 per cent used a specialist print magazine. Five years ago this figure was up at 60 per cent, Mr Helm said.
Trade Me and realestate.co.nz are the two major property listing websites in New Zealand.
The trend showed that online numbers were increasing and print numbers were decreasing, Mr Helm said.
"The industry's telling us it's so much more important to be conscious of what you advertise online and how you advertise it and also how you promote it."
All properties for sale in the country were now advertised online, but not all properties were advertised in print, he said.
But PropertyPress general manager Pat Houlihan said advertising property in print was "absolutely" still strong.
He was not surprised by Mr Duncan's comments and said within the past four months the company had produced the largest Central PropertyPress ever.
"It's scarcely a sign of the disappearing print medium."
He was not seeing a decline in the number of people using PropertyPress, but added he could not look to the future and predict what will happen.
"We don't know until the deadline how much our volume is going to be, so I don't know what the volume will be or how many ads there will be in three months time. No one does. We just find out on the week what the activity is."
PropertyPress was living proof that advertising in traditional print mediums was successful, he said.