The article explores the role of integrative public policy on delivering sustainable development by assessing the performance of public mega projects. Research methods use a literature review analysis on previous articles, policy and country briefs, and theory to discuss integrative public policy in a sustainable development context. The article engages in a case study analysis on Egypt's Decent Life (Hayah Karima) Initiative launched in 2019 to improve the standard of living for the neediest social groups, villages in specific; the objective is to compare how and why the evaluation of public policy could be embedded within country mega projects to sustain development. The article proposes answers to the following research questions: How is integrative public policy translated through country mega projects to support sustainable development? How could policymakers ensure sustainability mobility in mega projects, considering Decent Life, as an example? What indicators are used to measure the effectiveness of public policy on embedding sustainable development in mega projects? The hypothesis emphasises that mega project performance is dependent upon integrative public policy, collective affective conditions, and sustainable development mobilisation techniques. Findings propose a set of indicators, assessment tools, and a strategic management criterion, to evaluate how effective the Decent Life initiative is and to consider it a reflection of Egyptian public policy on sustainable development. Lessons learned are extracted from Egypt's experience.