Single session therapy (SST) is an increasingly popular approach to mental health treatment that aims to address clients' presenting difficulties in a single appointment. However, experiential approaches to SST are limited. In this paper I describe the theory and practice of "chairwork" -- an integrative, action-focused method of intervention centred on the concept of self-multiplicity -- and outline how these procedures can be coherently applied in a single-session format. A preliminary protocol for delivering single-session chairwork (SSC) or "brief dialogical psychotherapy" is presented, alongside a case illustration that demonstrates features of this approach. Finally, directions for future research and the continued development of chairwork as a psychotherapeutic modality are considered.