International Journal of Sustainable Building Technology and Urban Development ISSN:2093-761X(Print) 2093-7628(Online)

This research aims to analyze the environmental impacts per step of the life cycle of the office building as part of the reduction of GHG emissions in the construction sector. For this purpose, the data about the design documents, quantity and building energy efficiency rating were collected, and primary building materials and annual energy consumption of buildings were analyzed. In addition, according to the G-SEED 2016 building life cycle assessment guideline which is building certification system in South Korea, the environmental impacts generated in life cycle of office building were quantitatively assessed, and the environmental impacts of the production, construction, operation and decommissioning stages were analyzed. As a result of the analysis, the environmental impacts of each environmental impact category were largely generated at the production stage and the operation stage. In particular, the environmental impacts of global warming (GWP) and resource use (ADP) at the operation stage were dominantly analyzed. It is analyzed that the environmental impacts during operation are highly evaluated due to the energy consumption of the heating, cooling, hot water supply, lighting and ventilation sectors which are continuously used for 50 years. On the other hand, the results of the environmental impact assessment for the ozone layer (ODP) at the production stage were analyzed relatively higher than the GWP and ADP. In the upcoming future, it will be possible to reduce GHGs emissions in the building sector for the design of the building by analyzing the cause of the increase in the environmental impact of each stage and considering this.