What if cities were designed not just for innovation and growth but also for ongoing care and repair? My thesis explores repair as a political and ecological practice, one rooted in care, maintenance, and collective responsibility. In the face of climate change, systemic inequality, and infrastructural neglect, I argue that repair must be reimagined not as a reactive fix but as a transformative, community-led approach to sustaining urban life. Working in New York City, I examined how repair work, especially in marginalized neighborhoods, is often carried out informally, invisibly, and without recognition. These grassroots efforts fill the gaps left by failing public infrastructure, yet are rarely acknowledged as vital contributions to urban resilience. Repair becomes both a response to systemic abandonment and an act of civic agency. For my project, I drew on the work of scholars like Shannon Mattern and Stephen Graham, who understand maintenance as central to cities’ functioning. I build on their ideas by proposing a triad of repair, maintenance, and critical care as a framework for just and sustainable urban futures. My research included the creation of three participatory tools: a crowdsourced digital repair map, a community repair guidebook, and a facilitation guide for organizing repair workshops. These tools are meant to support residents in documenting local needs, imagining new repair infrastructures, and reclaiming ownership of their environment. Ultimately, this project positions repair as an essential urban practice, a way of rethinking how we live together in cities. It calls for designers to center care, for infrastructure to reflect justice, and for communities to lead the work of sustaining the places they call home.