<![CDATA[This study examines the decision-making dynamics behind the selection of environmentally friendly materials in medium-scale construction projects in Balikpapan, East Kalimantan. Using a qualitative case study approach, in-depth interviews were conducted with eight key informants, including engineers, project managers, and a quantity surveyor. Thematic analysis reveals that material selection decisions are shaped by dynamic negotiations among technical performance, cost efficiency, schedule constraints, and risk perceptions, with project managers and quantity surveyors playing decisive roles. The study highlights that in medium-scale projects, the adoption of environmentally friendly materials depends more on cross-role decision-making mechanisms than on individual environmental awareness. These findings contribute to practical insights on sustainable material selection and provide an empirical basis for developing more contextual green construction strategies at the project level.]]>
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