<p>Heatwave - a climate extreme event is a prolonged period of abnormally hot weather, which flows significantly above the normal nature in a particular region during a specific time. It can disrupt not only daily life but also pose intense health risks on human beings, especially the labor class. This study analyzes the role of socio-economic factors influencing worker`s vulnerability to heatwaves, identify the physical health impacts of heatwaves on construction workers, and explore the workplace initiatives to reduce the impacts of heatwaves. Sequential explanatory design, a type of mixed methods approach was employed in this study. The investigation reveals that construction workers cannot lead a sound life and are unable to buy heat-mitigating products due to socio-economic disparities. They are economically vulnerable as there are fewer earning members in the family and have more dependents. For this reason, they are forced to work overtime even in the extremely hot weather. They experience various physical health challenges while working, i.e. excessive perspiration, dehydration, fatigue, headache, dizziness, fainting, and heatstroke. Sometimes, they do not get sufficient heat-mitigating products from employers. Thus, they are impacted physically and economically and have even the highest risks of mortality. This paper argues that construction workers are vulnerable to physical health risks due to extreme heat. They do not have access to sufficient heat-mitigating equipment and the financial capacity to buy these protective measures. Therefore, this study suggests that these physical risks can be lessened by providing heatwave mitigating products, increasing wages, reducing working hours, increasing proper rest breaks, strengthening local medical support, constructing shaded areas near workplace, and enhancing awareness campaign.</p>