This paper describes and justifies the protocol for a research project investigating regional secondary school consolidation reforms in New South Wales, Australia. The study is designed to describe the experiences of those directly involved in the transition to a consolidated school in a way that has so far eluded educational leadership researchers. Identifying five themes from the international literature on school consolidation (leadership and governance; staff and student wellbeing; teaching and learning; curriculum and pathways; community satisfaction), the paper then articulates a systematic research protocol for examining the transition from individual schools through to a consolidated school. Previous studies have not systematically examined this transition and how it shifts practices and perceptions from different stakeholder perspectives. Using a purposeful merger of quantitative and qualitative forms of evidence, this study protocol has the potential to play a defining role in the area of school consolidation reforms. The applicability of the study design holds promise as an adaptable, focused, and sustainable protocol for generating understanding of school consolidation transitions and developing an empirical evidence base that is localised, internationally benchmarked, and critical for school decisions about investments and outcomes for educators, students, and communities.