Study of building energy efficiency standards of Japan

Japan’s building energy efficiency standards have been authorized and promoted ever since the implementation of Energy conservation law in 1979. Regarding to the rapid increase of building energy consumption, Japan’s building energy efficiency standards have been upgraded for several times. In 2013, three building energy efficiency standards are combined into one, and the newly updated standard will be mandatorily implemented by 2020. Presents the development history, main content, key parameters and the implementation of the building energy efficiency standards of Japan, and analyses the technical features of the newest version of the energy efficiency standards.