BackgroundTrust is essential for healthy, reciprocal relationships; creating safe environments; engaging in transparent interactions; successfully negotiating power differentials; supporting equity and putting trauma informed approaches into practice. Less is known, however, about the ways that trust-building may be at the forefront of consideration during community capacity building efforts, what trust-building elements are perceived as essential for optimally engaging communities, and what practices might support these efforts.MethodsThe present study examines an evolving understanding of trust-building over the course of 3 years, from qualitative data derived during interviews with nine agency leads from a large and diverse urban community, who are spearheading community-based partnerships to create more trauma-informed communities and foster resiliency.ResultsData reflected fourteen trust-building elements, captured by three themes: 1) Building relationships and engagement (e.g., behavioral practices such asmeeting people“where they are at” andcreating safe spaces), 2) Embodying core values of trustworthiness (e.g., traits such asbeing transparentandembodying benevolence), and 3) Sharing decision-making, championing autonomy, and addressing barriers to trust (e.g., collaborative practices such ascreating a shared vision and goalsandaddressing systemic inequities). These trust-building elements are presented in the Community Circle of Trust-Building, which provides an accessible, visual format that can facilitate capacity building efforts within organizations and with the broader community; guide the selection of training opportunities that support healthy interpersonal relationships; and aid in the identification of relevant, supporting frameworks (e.g., health equity, trauma-informed practices, inclusive leadership models).ConclusionsCommunity engagement and trust are essential for overall health and well-being, increasing equitable access to resources, and supporting an effective and connected citizenry. These data shed light on opportunities for trust-building and thoughtful engagement among agencies working directly with community members in large urban areas.Supplementary InformationThe online version contains supplementary material available at 10.1186/s12889-023-15860-z.