GHG EMISSIONS DURING THE CONSTRUCTION PHASE OF GREEN BUILDING: A CASE STUDY UNDER TREES CERTIFICATION

Abstract

Many green building assessment systems prioritize reducing environmental impacts during the operational phase, while the construction phase—where energy and material use are highly concentrated—often receives less attention. This study examines how Thailand’s green building certification system, TREES, contributes to managing GHG emissions at construction sites. It reviews current TREES requirements related to construction practices, emission management methods, and major emission-intensive activities and equipment. Using IPCC guidelines, the research analyzes the TREES Platinum–certified Thammasat Advanced Medicine Center, estimating monthly emissions over five years based on electricity and fuel use. Early construction phases were dominated by diesel-based emissions, while later phases shifted toward electricity due to increased use of electric tools. Although lower than operational emissions, construction-stage emissions remain significant. Only three TREES sections directly address construction, and they lack quantitative carbon accounting. The study proposes improvements such as equipment electrification, portable solar panels, sustainability training, and stronger regulations to support greener construction in Thailand.