Assam has peculiar geographical and climatic conditions; which has shaped its culture, practices and vernacular style. We see direct influences of such features on society which has remained self-sufficient for centuries and their reflections in ethnic styles in food habits, clothing, agriculture, fisheries, architecture, beliefs, recreation, etc. Objective of this research is to conduct studies on ethno-cultural influence mapping in evolution of vernacular architecture. Study was conducted to find existing conditions in various domains of public life, aspirations, occupational activities, supporting infrastructure, for system analysis and intervening areas which can maintain idea of sustainability around local building designs. Study resulted in identification of Acts, Actors and their Inter-relationships which are crucial for evolution of such typology and socio-cultural system. Design Directions on four perspectives are drawn. © 2019, Springer Nature Singapore Pte Ltd.