The global built environment currently faces a multitude of significant challenges that are set to increase in the generations to come. The greatest challenges include increasing urbanisation and its impact (Chávez et al., 2018; Dabrowski et al., 2024); climate change impacts (Van Vuuren et al., 2025); housing affordability and social justice (Nygaard & Kollmann, 2023); resource over-use and depletion (IRP, 2024); and the United Nations Sustainable Development Goals construct collapse (Lederer, 2025). While previous studies have examined these impacts individually, little attention has been paid to how the individual challenges combine to create a “polycrisis” effect (Collste et al., 2025; Delannoy et al., 2025) that exacerbates the impact on the built environment. Building on the related work on crisis amplification and polycrisis impacts (Collste et al., 2025); resource depletion impact (IRP, 2024); and urban circular economy (Chlebna et al., 2024; Dabrowski et al., 2024; Williams, 2020; 2023), this study extends the theme of built environment futures to include the impact of the current global polycrisis. To address this gap, I present a conceptual analysis of how a circular economy transition in the built environment presents an important pathway to mitigation of the polycrisis impact. The contribution of the paper is to provide clarity to the dynamics of the current polycrisis as it affects the built environment, and the amplification effect arising from the interaction of its individual constituents. It considers the collapsing influence of the United Nations ‘Sustainable Development Goals’ as one of the current global crises (UN-ESC, 2023). This work opens up new avenues of investigation in scholarly work on sustainable built environment futures.