Introduction: The challenges experienced by adults living with autism spectrum disorder (ASD) regarding their interaction with their home environment are thinly documented, although these issues persist with age. Based on the Model of Competence, this study aims to explore the human and nonhuman elements of the home environment influencing the functioning of autistic adults. Methods: An exploratory-descriptive qualitative study was conducted in Quebec City, Canada, with autistic adults (n = 6). Individual semi-structured interviews were undertaken by a single interviewer until data saturation was reached. A content analysis was conducted using NVivo software with a list of codes adjusted according to new emerging themes. Results: Eight themes emerged and were grouped into three categories--(1) Person -- Adult living with ASD: coping skills, anxiety; (2) Microsystem -- Home environment: entourage, sensory elements, spatial arrangement; (3) Person-environment interaction: routines, socialization, control. The experiences of autistic adults highlight the varied interactions experienced with the nonhuman and human elements of their homes, sometimes resulting in a situation of handicap related to their activities and roles. Conclusion: This qualitative exploration of the environmental challenges experienced at home by autistic adults introduces a better understanding of the person-environment interaction, allowing for easier functional assessment and improved home support.