Background: The social networks of adults with intellectual disabilities are often small and may be limited to family, paid staff and others with disabilities. This study explored the social inclusion of six individuals who joined mainstream leisure clubs or became local volunteers. Method: This qualitative intervention study provided structured support and education to local connectors, existing members of clubs/organisations who provided one-to-one support to new members with intellectual disabilities. After 4 months, qualitative interviews were conducted to explore the experiences of the six participants with disability. Data were analysed using content analysis. Findings: Individuals joining mainstream leisure clubs or volunteering, with natural supporters, creates opportunities for making new acquaintances and expanding social networks. Finding local connectors and opportunities for shared volunteering or leisure activities based on personal goals/interests are key to individuals forming new acquaintances close to where they live. Barriers and facilitators to participation are identified. Conclusions: Adults with intellectual disabilities becoming volunteers or joining mainstream leisure clubs has the potential to lead to enhanced opportunities for social inclusion in their neighbourhoods. Implications for policy and practice are examined. Recommendations for further research are explored. A Valued Social Role Checklist developed from this study offers a tool when sourcing social roles.