The projectification of organizations and the increased interest among researchers to developknowledge about temporary organizations has led to a lot of interesting work, most oftenfocusing on project-based organizations or firms. More scarce is research that focuses on howtemporary organizing takes place in permanent host-organizations that perform the larger partof their activities in processual, routine-based operations. Previous researchers have argued thatin such semi-temporary organizations, tensions emerge between the temporary and permanentdue to competing organizational logics. How these tensions are played out in daily workpractices is however not known. This paper addresses this gap, drawing on an in-depth casestudy of a waste management company. Using practice theory as an epistemological lens, weanalyze the practices involved the temporary organizing in the company in light of the fourbasic dimensions of a temporary organization, time, team, task and transition (Lundin &Söderholm, 1995). Doing so, we are able to theorize the “muddy” practices of temporaryorganizing in a permanent host-organization.