In new generation schooling contexts, the interaction of human activity, space, and objects, co- produce spatialised practices. There is the fluid use and continuous re-design of learning spaces, where dynamic socio-material practices support the ongoing and negotiated development of curriculum, pedagogy and assessment. Links are forged in this article between spatialised practice and student agency. In Aotearoa/New Zealand there is a national policy impetus for all schools to move towards re-designed learning spaces. School leaders are challenged with a mandate to lead pedagogic change to develop assessment capability, in alignment with the redesign of education facilities. Informed by theories of space, the case study research investigates how school leaders conceptualise student agency within flexible learning spaces. School leader interview data are used to generate dimensions of socio-material agency with consideration given to practice. Assessment practices in flexible learning spaces can enable 'dialogic', 'curriculum', and 'spatial' dimensions of agency. Pedagogical practices that support agency in flexible learning spaces are a focal area for ongoing investigation.