Australia has unveiled a comprehensive, technology-driven plan to achieve net zero emissions by 2050. Office buildings are responsible for more than one quarter of total energy consumption in non-residential buildings. Based on the projection of Commercial Building Baseline Study report, the energy use in this type of buildings will rise by 11.08% between 2020 and 2050. In pursuit of net-zero energy demand targets for Australia by 2050, the Australian government must therefore develop strategies to halt the accelerated development of office building energy demand. Indoor Environmental Quality (IEQ) is a critical aspect of building design and operation that directly impacts the well-being, health, and productivity of its occupants. It encompasses a range of factors including indoor air quality (IAQ), thermal comfort, lighting, acoustics and so on. Properly managed IEQ ensures that the indoor environment is free from pollutants, has adequate ventilation, maintains comfortable temperature and humidity levels, and provides appropriate illumination for tasks that are to be carried out. The systems that regulate these factors, like HVAC (heating, ventilation, and air conditioning) and lighting systems, are significant energy consumers. Optimising for a high-quality indoor environment often means adjusting these systems, which can lead to increased energy consumption. However, advancements in sustainable building design and technology are striving to achieve a balance, ensuring optimal IEQ without excessive energy use. This study aimed to conduct a comprehensive examination of the IEQ field, concentrating on indexing and modelling methodologies, establish criteria for the development of quality IEQ models, evaluate the current policy of Australia concerning the indoor environment and energy consumption of commercial buildings, and collect perspectives from building experts and empirical data to gain a deeper understanding of the influence of IEQ on energy use and occupant satisfaction. [...]