In the context of a trend towards inclusive practice in Irish primary schools, many teachers feel ill-equipped to cope with this new challenge. Scope exists within the Irish education system to transform mainstream schools into autistic spectrum disorder (ASD) friendly environments. Research into teacher perceptions of inclusion has found that teachers' views impact on how inclusionary practices are implemented. This study utilised semi-structured interviews with six primary school teachers. The data were analysed using interpretative phenomenological analysis (IPA). Findings from this study suggest that the majority of teachers were apprehensive and lacked confidence at the initial prospect of teaching a child with ASD. The majority of the teachers interviewed also described feelings of uncertainty in managing the behaviour of a child with ASD. These findings were analysed in the context of teachers' perceptions of systemic issues such as lack of access to resources, support and training in ASD-specific approaches.