This study explores designers, engineers, and managers sharing their knowledge and resolving design-related issues during construction site meetings. It provides new insights into the collaboration and the expertise of the different partners. In addition, the study provides new knowledge of using LPS in the design phase and its influence on the site meeting discussions in the construction phase. The research data comprise video recordings of 17 site meetings in two BIM-based renovation projects. Based on the data, the construction managers were the most active in addressing issues; however, all partners were actively involved in the discussion and shared their expertise to address the open questions. The use of the Last Planner System in the design phase seemed to decrease the number of design-related open questions in the construction phase. The findings emphasize the need to develop more collaborative design management methods and practices for sharing each expertise.