The present case study is the first to examine transformational leadership within a community coaching environment. To provide a rich, detailed exploration of transformational leadership, a mixed-methods approach was adopted. This included live systematic coach observations and structured diary entries to capture the content and outcome of the coach’s transformational behaviours, whilst a focus group with the coach’s athletes identified the impact of the coach’s transformational behaviours. Finally, the data collected from these methods informed a semi-structured interview which explored the professional judgement and decision making processes underpinning the coach’s use of transformational leadership behaviours. The data collected from observations, diary entries and focus groups were deductively analysed based on the Differentiated Transformational Leadership Inventory to illustrate the content and outcomes of the coach’s transformational behaviours. This revealed how the coach exhibited transformational behaviours within the coaching process, with the most frequently cited and observed outcomes being improved performance and increased motivation. The data gathered from the interview was inductively analysed to determine the factors influencing the coach’s engagement in transformational leadership. Emergent themes included opportunities to develop player performance and learning, engaging in reflective practice and observing more experienced and qualified coaches. These findings are discussed in relation to previous transformational leadership research and effective coaching practice. Finally, practical recommendations are offered for coaches operating in a variety of coaching contexts.