Problems in the design and engineering phase of state buildings, especially the ATC Tower construction project and supporting facilities, are recurring phenomena that need more attention in the project development phase. Some of the problems are flaws in the Detailed Engineering Design (DED) documents, discrepancies between DED documents (Drawings, Engineer’s Estimate, BOQ, and Work Plan & Terms), and late completion of design and engineering works. These problems can have an impact on the implementation of construction, such as rework which results in additional time and costs. Several problems in the design and engineering of the ATC Tower Building and supporting facilities indicate that the design and engineering phase is not running effectively and efficiently. To realize an efficient and effective design and engineering stage, it is necessary to standardize operational procedures or an efficient and effective design and engineering work system. This research aims to develop a standard operating procedure regarding the design and engineering works of the ATC Tower Building and supporting facilities.

The product of this study is a Risk-Based SOP for the design and engineering phase of the ATC Tower and supporting facilities construction project which can improve efficiency and effectiveness in the related works. The Risk-Based Standard Operational Procedure (SOP) is developed by adding risk response activities that are obtained from the risk analysis stage in this research. Methods used in this research are archive analysis/literature study, questionnaire survey, and Delphi’s method. The results of this study indicate that there are 4 business processes in the design and engineering phase of the ATC Tower and supporting facilities construction project, namely the Conceptual Stage, Pre-Engineering Plan Stage, Design Development Stage, and Detailed Design Stage. There are also a total of 93 potential risks that may occur in the design and engineering phase of the ATC Tower and supporting facilities construction project with 29 risk factors categorized as high risk.