The construction sector is significant, contributing approximately 10% of industrialised countries' Gross Domestic Product (GDP). However, it is complex and associated with a high level of risk that leads to failures in terms of time, cost and quality. Thus, problems are evidenced in the execution of infrastructure projects, such as delays, cost overruns, poor quality of work and increased musculoskeletal disorders in workers. The present study seeks to increase operational efficiency by addressing the fundamental reasons and causes identified in the study, delays in the work plan, unproductive work time, and work stoppage time. Consequently, these causes have generated an economic impact of 8.62%. Given the above, a pilot validation was carried out where it was proposed to implement Lean tools (Standardized Work), an ergonomic analysis (Economy of Movements) and a Behavior Based Safety System (BBS) to the positions with the highest incidence of occupational hazards in order to solve the sub-causes that generate low efficiency. Finally, the proposal allowed for increasing the operating efficiency of the gas installations to 88.00%, reducing the cycle time by 45.00%, increasing the safe behaviour index by 45.16% and reducing the average dysergonomic risks by 54.84%.