Shutdown/Turnaround/Outages (STOs) are unique construction projects required to meet demands such as maintenance needs, increased market demand, and changes in technology. Shutdown, Turnarounds, and Outages projects (STOs) are maintenance projects subject to compressed schedules, and hence require a time efficient cost control system with robust monitoring, reporting, and mitigating to ensure the success of the project. The purpose of this research was to address the significant lack of literature about project controls for STOs by identifying current project control tools used by industry practitioners. Relevant data was collected using the Delphi methodology. The Delphi process, an approach particularly effective in exploring areas of research where there is little or no information available, was applied to the collected data to allow for anonymity, interactivity, and feedback in the survey process. The data collection process involved three rounds of surveys: (1) Survey Round 1 was conducted using questionnaire, (2) Survey Round 2 through conducting semi-structured interviews, and (3) Survey Round 3 using questionnaire. The questionnaires used in Survey round 1 and Survey round 2 had two parts – Part A and Part B. Part A was designed to collect demographic data and Part B had three main sections. The first section was to prove that STOs vary significantly from traditional construction projects; the second section to obtain information on current practices, and section three to analyze barriers to implementation of optimum project controls. The research contributes to the body of knowledge through addressing the significant lack in literature on STOs and project controls for STOs. Additionally, the paper informs less experienced professionals about information required for effective planning and risk management processes by providing a list of risk factors. The research results will be fundamental to improving project controls processes for STOs and may also benefit traditional projects and provide significant information on the cost and schedule controls for STOs.