As climate impacts intensify, planned relocation is increasingly deployed as an adaptation strategy, yet outcomes for relocated communities remain consistently adverse. This paper argues that these failures stem from the treatment of planned relocation as a short-term, projectised disaster response rather than as a long-term developmental intervention. Drawing on social protection theory, this paper reconceptualises planned relocation as a form of social assistance, capable of delivering durable solutions. It demonstrates that planned relocation inherently performs preventive, protective, promotive, and potentially transformative social protection functions by minimising future climate risks, providing non-contributory transfers such as land and housing, and enabling livelihood reconstruction. However, when implemented outside formal social protection systems, these functions may collapse, often resulting in impoverishment and protracted displacement.