Reducing the embodied carbon of reinforced concrete structures is crucial to mitigate climate change. Several stakeholders in the construction value chain can contribute to this effort. Therefore, this work quantifies the influence of various decisions made by different stakeholders on the global warming potential (GWP) of a reinforced concrete structure. These decisions include the structural design, material embodied impact, transportation distances, and construction practices. Herein, each decision is modelled as an uncertainty source and its contribution to the total uncertainty of the structure’s GWP is assessed. Two scenarios are considered: business-as-usual, which only considers conventional concrete mix design, and an innovation scenario, which also considers the option of high-filler low-water concrete.