A rising supply of "flexi-room" apartments has drawn a warning from authorities - people who use the undersized areas as bedrooms could be fined.
Auckland Council sets minimum sizes for one, two and three-bedroom apartments and those not meeting the standards are being sold as "flexi-room" residences.
Some "two-room flexi" apartments are being sold for more than $600,000.
But apartment-dwellers who move a bed into a "flexi" room could be hit with a $750 fine under council rules capping the number of bedrooms permitted in the tiny units. The rules came into force in 2009 but are under fresh scrutiny as high-rises crop up around the city.
A phenomenon that began in big cities such as New York, flexi-rooms are included on plans as spaces for a study, media room or storage area. But many buyers intend to use them as bedrooms.