Method for Estimating Labor Productivity Loss Due to Overtime

This technical report presents a method for estimating the loss of labor productivity due to overtime work in the construction industry. It outlines a retrospective approach that applies productivity loss factors derived from the Mechanical Contractors Association of America (MCAA) Bulletin No. OT1 Revised, which averages results from four established overtime studies. The report details the steps involved in applying these productivity indices (PIs) to actual hours worked by individual employees on a week-by-week basis. It discusses the advantages of this method, including its time and cost-effectiveness, as well as its ability to provide detailed insights into productivity losses for specific workers or timeframes. Additionally, the report addresses potential disadvantages and critiques of existing methodologies for estimating productivity loss, emphasizing the need for a reliable and universally accepted approach. The document includes tables that illustrate productivity indices and examples of how to implement the proposed method using Excel.