Internationally, there has been a significant focus in policy and practice on the participation of children and young people in decisions that affect them, underpinned by respect for their rights under Article 12 of the UNCRC. While children’s participation has become a core focus for practice improvement in child welfare services, there is a dearth of practical examples of how participation is implemented in organisations. In this paper, we provide a reflective case study of participation in practice in the Youth Advocate Programme (YAP) in Ireland, a large non-profit child welfare organisation. YAP Ireland works with young people who are considered ‘high risk’ using a strength-based approach in a wraparound service that is family-driven and youth-guided. Drawing on qualitative interviews and focus groups with young people, parents, advocates, and staff and management, we describe and critically analyse YAP’s approach to participation. Critical factors in practice include a commitment to participation in policy, practice and culture at all levels of the organisation and scaffolding of participation by staff. Challenges include ensuring that participation principles are upheld consistently across the organisation and resourcing participation.