This article explores how sustainability is made present and visible in the life of residents in a new neighbourhood. Glass is enacted by design professionals and a Swedish municipality to create spaces for residents that fulfil sustainability objectives and put daily life on display. However, some practises developed by residents resist the intended uses of these spaces. Through a detailed case study of the proclaimed new role model neighbourhood of Vallastaden in Linkoping, Sweden, we critically investigate the ontological politics of the residents everyday life, including their social life with neighbours, low-energy living, interactions with local small businesses, recycling habits and mobility habits. By attending to glass, we show how humans, non-humans, materials and technologies become part of everyday practises and help uncover the ontological politics of mundane life.