Background: The key element for the success of construction projects in the era of tech-nology and information is knowledge. Knowledge management in the construction sectorhas become a necessary and vital matter, starting with the planning stage, designing,implementing and ending with operation and maintenance stage. One of the most promi-nent features of knowledge in the construction sector is the building knowledge modeling(BKM).Problem: Although the design stage is considered one of the most importantstages of the construction project in terms of eliciting the knowledge element, designers suf-fer from poor knowledge management, as well as their inability to exploit the capabilitiesand benefits of building information modeling (BIM), especially knowledge management.Objective: The main aim of this study is to present a conceptual model that integratesthe basic principles of knowledge management with contemporary principles of BIM inthe design stage and has the ability to store, classify and share the knowledge gener-ated from past designs into future projects.Methodology: The research methodologyis constructed on reviewing the pillars of the proposed conceptual model, namely: BKMparameters, BKM library, and BKM clash detection system, then a hypothetical case toprove the validity of the proposed conceptual model using Basmaya residential complexproject in the Republic of Iraq is presented as a case study.Results: New four definitions are introduced: client knowledge, context knowledge, standards knowledge and technicalknowledge. The conceptual model proposed in this study has shown great ability andhigh efficiency in improving and developing knowledge management in the design stage ofbuildings and projects. In addition, the knowledge stored in the BKM library can be reusedin designing new projects in the future.Novelty: The conceptual model has the abilityto update constantly itself over time by sharing the knowledge of designers, suppliers andother stakeholders.