Labor productivity impacts the overall
cost and schedule performance. Thus, an accurate prediction of labor
productivity is required to estimate project costs and schedule. Many
researchers have measured labor productivity and identified factors
affecting labor productivity losses, but only a few have explored labor
productivity losses in cleanroom conditions. This paper presents the
impact of cleanroom conditions on construction labor productivity by
comparing two data sets that were derived from work on a semiconductor
fabrication facility (FAB) construction project. Both data sets involved
the same crew working on the same FAB construction project. The results
indicate that, in cleanroom conditions, construction labor productivity
fell by 28.85% compared to general conditions. Additionally, interviews
with project managers revealed that the difference was affected by
additional factors, including access to tools, rework, and overcrowded
work areas. The factors cause significant inefficiency under the
cleanroom conditions; even though the factors affect both general and
cleanroom conditions. Factoring in the labor productivity decrease when
budgeting or scheduling allows cleanroom project stakeholders to
estimate project duration or cost more accurately. The primary
contributions of this paper are the identification of the labor
productivity difference and the factors that cause the difference when
working in cleanroom conditions.