Design is often positioned as collaborative problem-solving, yet in contexts marked by structural inequity, historical trauma, or power asymmetry, collaboration itself can (re)produce harm. Conflict-Sensitive Design (CSD) integrates principles of Trauma-Informed Restorative Practice (TIRP) with participatory and peacebuilding design traditions. It extends the static philosophy of “Do No Harm” into an active process of inclusion. Drawing conceptually from conflict transformation, design justice, and critical social theory, CSD frames conflict not as a disruption to be managed but as a lens through which exclusion and relational imbalance become visible and can be addressed. Its foundational elements, contextual awareness, reflexivity, iterative feedback, and process transparency, align with trauma-informed commitments to safety, trustworthiness, and empowerment. CSD conceptualizes design as a sequenced, mediated process in which stakeholders situated in unequal or adversarial relationships engage through structured reflection and facilitated exchange. By integrating restorative principles of acknowledgment, repair, and inclusion, the framework reconceptualizes participation as resilience building through relational healing rather than procedural consensus. Understanding the emotional and historical dimensions of conflict deepens a society or community’s capacity for equity and inclusion. Conflict-Sensitive Design promotes a design ethic and implementation process grounded in care, accountability, and adaptive learning. CSD offers hope and a pathway for reimagining inclusion in divided societies and institutions.