This deliverable describes the ontology suite which will form the basis for the ASHVIN digital twin platform. The ontological model conceptualizes physical objects, the environment on the construction site, and their virtual replicas to enable accurate version, configuration, and state management for a real-time construction digital twin. Additionally, the ontology suite will encompass the entire lifecycle for a civil infrastructure i.e., design, construction and operation. The document primarily comprises of three ontologies ConDT, DesDT & OpDT for the construction, design, and operation phases respectively for a built infrastructure’s digital twin.