The construction industry has always sought innovative methods to improve efficiency, reduce costs, and increase accuracy in project execution. Among these, Building Information Modeling (BIM) plays a key role as one of the most important transformative technologies in the advancement of this industry. BIM is a comprehensive approach for planning, designing, executing, operating, and maintaining buildings, which creates a digital model of the building containing all data related to structural, MEP, and architectural elements. Using BIM, all project stakeholders, from engineers and architects to contractors and executive managers, have access to an integrated information source, which improves collaboration, reduces design errors, increases productivity, and lowers project costs. This technology, in addition to 3D modeling, provides capabilities such as project scheduling, cost estimation, energy analysis, and building maintenance management, leading to the optimization of construction and operational processes. Next, we will review the impact of BIM on reducing costs, increasing productivity, and data integration in construction projects, and we will present a successful case study of applying this technology in combination with Geographic Information Systems (GIS). How does BIM reduce costs? Reducing Design Changes and Revisions: One of the main reasons for cost increases in construction projects is unexpected revisions and changes in design, which often occur during execution phases. BIM provides all stakeholders with a comprehensive view by creating an accurate 3D model of the project, preventing design mistakes and costly changes. Optimal Management of Resources and Construction Materials: BIM enables the optimal management of materials and construction supplies. Through precise simulation and analysis, the amount of materials needed is accurately estimated before the project starts, preventing over-purchasing and resource wastage. This leads to lower direct costs and reduced waste on the project site. Reducing Delays and Costs Due to Poor Coordination: A common problem in construction projects is the lack of coordination between design, execution, and engineering teams, leading to disputes and conflicts at various construction stages. BIM acts as a common platform, integrating engineering models and identifying and resolving potential conflicts between different sections (structure, architecture, MEP, etc.) before project execution. This prevents problems during execution and reduces corrective costs. Increasing Accuracy in Cost Forecasting: BIM, using cost estimation capabilities (5D BIM), enables the review and financial analysis of the project in early stages. This feature allows project managers to calculate costs more accurately from the beginning and prevent budget deviations. How does BIM increase productivity? Integration and Team Collaboration Throughout the Project: One of the biggest challenges in the construction industry is the lack of effective collaboration between different teams. BIM creates a shared and transparent database for all project team members, providing information to all stakeholders in real-time. This improvement in communication and coordination between teams reduces error rates and increases project execution speed. Better Planning Using 4D Simulation: BIM, in addition to 3D modeling, also enables the planning and scheduling of execution phases. This feature, known as 4D BIM, helps project managers adjust the execution schedule with higher accuracy and reduce potential delays. Optimizing Maintenance and Asset Management: The benefits of BIM are not limited to the construction phase but are also applicable during operation, maintenance, and even building renovation. Using BIM, all information related to MEP systems, materials, and building equipment is accessible throughout the structure's useful life and plays an important role in operation and maintenance management. In the BG-DI architecture project in South Korea, the combination of Building Information Modeling (BIM) and Geographic Information System (GIS) technologies led to significant improvement in the management and monitoring of urban infrastructure. In this project, the engineering team was able to create a comprehensive and coordinated view of the project by integrating BIM data (such as 3D building models and technical specifications) with geographic information (including city maps, transportation networks, and the area's topography). This integration helped identify design conflicts before project execution, optimize utility routes, and reduce costs resulting from coordination errors. Furthermore, it enabled real-time monitoring and analysis of data, which resulted in a 30% increase in planning accuracy, a 20% reduction in execution costs, and improved performance in maintaining urban utilities. This project showed that combining BIM and GIS can lead to more efficient management, reduced delays, and the creation of smarter and more sustainable urban environments. BIM has revolutionized the construction industry through effective data management and process integration. This technology paves the way for more efficient projects and more sustainable environments by improving accuracy, enhancing collaboration, and reducing costs. With proper planning and strategy, existing challenges will be overcome, and new opportunities for advancement in this industry will be created.