Definitions of adulthood for people with intellectual disability are often complicated, with milestones being markedly different for this population. This is then associated with difficulties for both the people with intellectual disability and their parents, who are closely involved in this transitional period. This paper aims to report on parents' perception and experience of adulthood for their son or daughter with an Intellectual Disability (ID). Qualitative data were collected through 30-60-minute phone interviews with eight parents of a person with an intellectual disability aged 15 or older (mean parent age = 60; mean child age = 23). Thematic analysis found that Perception of Adulthood encompassed themes of Independence and Normality. Experiences of Adulthood were categorised under Government Services, Responsibility and Social Supports. Findings of this research provide information for the growing literature around adulthood for people with intellectual disability, as well as how to amend policies and procedures for services that cater to people with intellectual disability and their parents during this transition.