Health and safety practices bring about umpteen perks to every industry. Building construction industry garners the optimum advantageousness through health and safety practices in order to enhance the employee job performance towards the realizing of its objectives. This study aims to furnish the existing research gap by thoroughly scrutinizing the aforementioned impact in the context of Sri Lankan building construction industry with specifying the skilled labourers. Further, this study broadens the study area by examining the mediating effect of employee commitment to the relationship between health and safety practices and employee job performance. The study was conducted on a sample of 175 skilled labors, and selected by convenient sampling method. Data analysis was carried out with SPSS 23 version analytical software and descriptive, correlation and regression analysis were accompanied. Eventually, the findings reveal that the health and safety practices have a positive and significant impact over employee job performance and employee commitment. Further, it elaborated the positive and significant impact of employee job performance on employee commitment. Moreover, employee commitment contributed positive mediating effect to the relationship of health and safety practices and employee job performance. Hence, the study findings crucially elaborate the rationality of health and safety practices towards the sustainability development of building construction industry by improving job performance of employees with commitment.