Inner city units in Sydney, Melbourne, Brisbane and the Gold Coast sold off-the-plan have been declared a "clear and present danger" to property buyers due to over supply forcing down prices.
A report by trends forecaster Hotspotting said the number of apartments being released exceeded current demand.
And units in Sydney's "second CBD" Parramatta, compared to inner Sydney, posed an even greater risk to buyers on account of already falling sales volumes, the report said.
Analysts widely consider oversupply a red flag for off-the-plan buyers because it puts downward pressure on prices - increasing the risk of homes being worth less, when built, than their owners paid for them.
The Australian apartment report comes as funding issues have hit four big Auckland apartment developments. Flo Apartments in Avondale and the St James Suites apartment projects were axed last year over funding issues. Buyers at the Sargeson apartment project were told last year the price of a unit was rising from $465,000 to $535,000, while at Rose Gardens Apartments in Albany, where work is well advanced, buyers were being asked for 15 per cent more.