High-rise building construction projects are inherently complex, making them highly susceptible to various risks. Cost management is critical, as risks in each project phase directly affect the budget. Implementing a risk culture is essential for managing these risks and ensuring effective cost control. A well-developed and implemented risk culture can mitigate costs arising from previously unidentified risks. Furthermore, Government policies supporting risk management in the construction sector encourage project owners and contractors to adopt more effective strategies. This study evaluates the impact of risk culture on cost control in high-rise building construction projects. Data collection involved in-depth interviews and questionnaires targeting project managers, engineering manager and project control. Cost control effectiveness was measured using the Cost Performance Index (CPI) indicator, with regression analysis conducted using Python. Regression analysis results highlight several variables significantly improving construction project cost management, including clarity of risk governance, project planning, periodic reviews, information system support, leader commitment, risk identification, monitoring and review, and reporting. This study emphasizes the importance of a risk culture in achieving cost control and project success, which ultimately strengthens the company’s reputation and long-term success in the construction industry.