This study investigates the lived experiences of three casual relief teachers (CRTs) and their work within Australian primary schools for a period of one school year. Practice architecture theory was used as a theoretical framework to examine whether participants saw any advantages to working on a casual basis, how they think casual teaching could be improved in terms of access to accreditation support, and whether any growth to their professional practice took place during the course of the year. Monthly diary entries and two semi-structured interviews from each participant revealed some advantages to casual teaching, such as being able to work across different schools. Participants discussed the need for CRTs to complete accreditation in a timely manner and gain access to relevant professional learning. This study provides evidence of the complex and varied backgrounds and motivations of CRTs. Implications for future research in the area are also discussed.