Building Information Modeling (BIM) and Lean Construction are two strategies that are being used more and more to address these problems in tandem with the advancement of global construction technology. In order to apply BIM-Lean building to building projects in South Sumatra, it is necessary to determine the critical success factors (CSFs). Contractors, consultants, and project owners must understand these success characteristics in order to implement a BIM-Lean approach successfully, sustainably, and with a major influence on project performance. Lean Construction is the application of Lean Manufacturing concepts to construction project management. This strategy focuses on improving workflow, cutting waste, and boosting process efficiency in order to add value for clients. In contrast to traditional management techniques, which frequently place an emphasis on individual productivity, Lean Construction places a strong emphasis on teamwork, planning dependability, process stability, and information transparency throughout the project. The structural equation modeling–partial least squares (SEM–PLS) method is used in this study's quantitative methodology. The research aims of investigating causal links between latent constructs and predicting important factors influencing the success of BIM-Lean deployment are best served by this approach, which is why it was selected. Based on a Google Form questionnaire of 119 respondents, findings indicate strong support for the implementation of BIM-Lean Construction through management policies, HR competency, technology readiness, and communication. A significant 52.6% rated management policies as crucial, while 84.2% affirm teamwork supports continuous improvement. Technology assessments show strong reliability, with effective internet connectivity rated at 89.5%. Collaboration is also highlighted, with 57.9% agreeing on project information accessibility and 79% noting improved teamwork through BIM. Furthermore, a Lean culture is evident, with 57.9% strongly agreeing on adhering to work standards and 52.6% on waste reduction. Overall, the internalization of efficiency principles within the organization supports the effective integration of BIM technology, linking technical tools with a culture of continuous improvement for project success.