According to the statistics released by the Environmental Protection Department (EPD), HKSAR in 2016, waste in construction sites remains the second largest category of the total solid waste disposed of at landfills. As a driver to advance the development of green buildings in Hong Kong, the Hong Kong Green Building Council (HKGBC) aims to reduce the building material waste in order to confront the tough situation that our landfills are facing through the Green Design Guide for Material Resources Optimisation in Building Life Cycle. The aim of this Guide is to alert the public and building professionals about the building material waste problem and provide adequate guidelines during planning and design stages in minimising building material waste for the Hong Kong building industry.