The construction industry is characterized by fragmentation due to the distinct phases, as well as thecomplex structure of the industry itself. The numerous processes involve diverse stakeholders each requiringseamless integration through the accurate transfer of information to maintain its integrity. Different informationmodels both those defined by standards and industry-specific, complicate the choice of models to adopt, im-pacting interoperability. This research aims to develop a methodology to address this issue by unifying existingontologies developed for different information models. The approach combines elements of the Modular On-tology Modelling methodology, and the Level of Information Need (LOIN). This methodology is currentlybeing evaluated in collaboration with multiple companies in the Swedish AEC industry as part of an ongoingproject. Results suggest using standardized machine-readable data templates, industry accepted data dictionar-ies and ontologies based on standards enable unambiguous exchange of information along the value chain of aconstruction project.