Slides of a theoretical study undertaken in 2018 and presented at the South Pacific Passive House Conference in Melbourne. The study looks at what performance a medium-density apartment building in New Zealand needs to achieve Passive House. Gives an overview of Passive House in New Zealand at the time, an overview of medium-density housing, and international examples of Passive House medium-density housing. Details and results of the study are provided as well as a comparison to the New Zealand building code.