The article examines a possible renewal of the temporality of urbanprojects as a result of the adoption of principles of sustainabledevelopment. The reference to sustainable development has becomeessential in the production and management of urban spaces. Ifsustainable development is a temporal concept by definition, how doesit transform the way of thinking time in urban projects? Attention ispaid to the temporality of the urban project,the mode oftemporalization of action, to the making of common time of the urbanproject, and to the way actors deal with and are concerned about thequestion of the project times and their articulations with concerns forsustainable development. The study of three specific urban projectsshows that the urban project includes multiple temporalities. Thetangle of temporality related to the project activity, in the contextof sustainable development can not emerge as guiding principle despitethe stated objectives, does not undermine the time of it. It remains anannex time in a complex process.