The Oslo-based architecture firm RATIO already has several large commercial and governmental buildings to its name and is currently working on Norway’s largest and most environmentally ambitious university building. But even for private homes, RATIO has been a Norwegian pioneer for sustainability. Firm partner and general manager Sverre Svendsen explains that the measures the firm takes to build energy-efficient, passive houses with an aim of balancing out the energy usage are similar regardless of the size of the build.