Competitive advantage signifcantly matters for modern construction organizations as it promotes the sustainable development and safety management of projects. UK construction organizations have greatly sufered from a lack of safety and sustainability of project management in infrastructure development projects because of the COVID-19 pandemic. Post-COVID-19 UK infrastructure development projects are uncertain in the context of organizational competitive advantage as they cannot maintain sustainable project management. Tis study was conducted to identify, rank, and present a framework of factors infuencing the competitive advantage of UK organizations. Te study design involved identifying factors from the current literature, after which the most relevant factors were fltered with the help of semi-structured interviews with 15 experts. A pilot survey was conducted then, involving 192 respondents, after which a reliability test and exploratory factor analysis (EFA) were conducted on the results. A primary questionnaire survey involving 250 respondents was conducted, after which RII and confrmatory factor analysis (CFA) were conducted on the fnal data. A total of fve subgroups were found to be signifcant in the CFA, such as Resources and Policies, Quality and Delays, Motivation and Expectation, Management and Environment, and Government and Business. It is recommended based on fndings that the construction organizations of the UK have to consider working on identifed factors to maintain a competitive advantage in establishing sustainable project management solutions for post-COVID-19 UK infrastructure development projects. Copyright © 2023 Abdulrahman S. Bageis et al.