As everyone in the quality game is aware, the world now has a new version of ISO 9001. ISO standards touch almost everything an organization does and it helps to make the world a safer and more efficient place. This drives the need to evaluate the effectiveness of the standard and make changes to drive continual improvement within the organizations and industry-wide. The study was primarily conducted to determine the relationship between ISO 9001:2015 employee preparedness and work engagement among construction firms in Davao City. This study utilized a descriptive correlational research approach since the study sought to establish the relationship between ISO 9001:2015 preparedness and employee engagement among the construction firms in Davao City. Primary data were gathered and used in the study. This academic undertaking involved a representative sample of employees of the top seven (7) construction firms in Davao City per projects with the Department of Public Works and Highways. This study found out that there is a strong relationship between ISO 9001:2015 preparedness and employee engagement among construction firms in Davao City. It indicates that most of the employees in the construction companies are well-versed in the ISO preparation and implementation phases. This is generally supported by the very high level of preparedness and employee engagement among the employees.