This essay provides a comprehensive analysis of cost management in construction projects, focusing on the role of a professional cost manager. It examines the pre- and post-contract stages of projects, including a 10,000m2 public sector building in a developed country and a 2,000 m2 distribution warehouse in a developing country. The discussion covers risk assessment, value management, financial management, BIM, soft landing, and ethical considerations. The essay highlights the importance of cost management in achieving project success by delivering projects safely, on time, within budget, and to the required quality standards. It also addresses the role of quantity surveyors, value management processes, and the integration of BIM in enhancing project value and efficiency. The essay concludes by emphasizing the significance of ethical practices in building trust between contractors and clients and ensuring project integrity.