Embodied Carbon Assessment of Signage Systems in Urban Environments: Case Studies from Australia

Signage systems are an integral part of modern urban environments, and they influence both city aesthetics and information flow. But their growing use also adds to the embodied carbon footprint of urban infrastructure, a factor that is often overlooked in sustainable city planning. The present study investigates the environmental impact of signage within the context of urban development and climate-responsive design using two Australian case studies, including one installed at a national bank. The assessment is limited to the cradle-to-site (A1–A4) stages, focusing on material production and transportation impacts only. In each case study, one installed signage unit is used as the functional unit, with the results scaled to a nationwide-deployment scenario in Case Study 2. The results show that aluminium and steel dominate signage materials in both mass and embodied carbon. The study also proposes several mitigation strategies, including the use of low-carbon aluminium, higher-grade steel, and design optimization methods. A quantitative analysis also demonstrates the potential reductions in embodied carbon, ranging from 18% to 80.3%, with low-carbon material substitution achieving up to an 83.4% reduction in one case study. The findings also highlight that targeted material and design choices in the signage sector can significantly advance urban sustainability goals.