As people with intellectual and developmental disabilities (I/DD) age, it is important that I/DD agencies are prepared to support healthy ageing in homes and in communities. This study explored supports and barriers to sustaining community-based health and participation initiatives (CBHPI) for people ageing with I/DD living in group homes managed by agencies. The study utilized interviews and photovoice with 70 participants--35 individuals with I/DD and 35 management/direct support agency staff. Data were analysed through content analysis and triangulation of data where five themes emerged: Agency values and policies related to healthy ageing; resources and staff competencies; communication between management and staff; community/university partnerships; and peer relations. Findings show that I/DD agencies and people with I/DD value CBHPI, but they find them difficult to sustain due to limited resources and lack of training specific to ageing with I/DD. Conducting system-level research within I/DD agencies to include first-person accounts of people with I/DD, staff and management provides insight on how to effectively support the needs of people with I/DD to improve their health and community participation as they age.