Infrastructure is critical for the economic and social prosperity of society. Some large infrastructure projects are also critical for our future society due to their intragenerational nature and long lifespan. Understanding the social value of infrastructure is therefore important in order to deliver a socially successful as well as technically successful project. Stakeholder engagement, in turn, is critical in understanding and identifying social value, however, the strength of this relationship is often underestimated during project development. The impact of this underestimation can be detrimental to a project. Using the case study of the Didsbury Flood Storage Basin Improvements Scheme in Greater Manchester, this article demonstrates how the stakeholder engagement process is intrinsically linked to social value preservation, creation and enhancement on infrastructure projects. It is argued that by investing time, resources and money in the stakeholder engagement process, the social value creation and enhancement on a project can be significant. If this investment is missing on a project, the social value perceived to be received by stakeholders diminishes. Therefore, this article calls for a greater understanding of the interdependency between the stakeholder engagement process and social value, and a need for an appreciation of this relationship within the infrastructure sector.