Enclosure, a historic and contemporary accumulation regime, is part of a global conversation about what resources are, who may use them, and for what purpose. Here, it is suggested that spatial planning extends the practice of enclosure in its approach to land use. This article focuses on Wales's strategy for sustainable development (OPD), which theoretically promotes low-impact developments. Ethnographic research explored how OPD applicants navigate different people and organizations with a stake in the character of land, and how OPD applications are rarely approved. The data reveals a tension between the notions of self-provisioning and planned development, but indicates how activists circumvent and adapt the planning system. This article extends the notion of what counts as accumulation by focusing on the nonproductive value of an unspoiled countryside, a notion central to debates about the production of the countryside as leisure space and the enclosure of nature under global sustainable development regimes.