To investigate the organisational factors that impede or facilitate transition of young people from child and adolescent (CAMHS) to adult mental health services (AMHS).

Thirty-four semi-structured interviews were conducted with health and social care professionals working in child and adult services in four English NHS Mental Health Trusts and voluntary organisations. Data were analysed thematically using a structured framework.

Findings revealed a lack of clarity on service availability and the operation of different eligibility criteria between child and adult mental health services, with variable service provision for young people with attention deficit hyperactivity disorder, autism spectrum disorders and learning disabilities. High workloads and staff shortages were perceived to influence service thresholds and eligibility criteria.

A mutual lack of understanding of services and structures together with restrictive eligibility criteria exacerbated by perceived lack of resources can impact negatively on the transition between CAMHS and AMHS, disrupting continuity of care for young people.