With climate change already underway, cities are looking for ways to deal with its effects. To balance urban waterfront development and climate adaptation, floating housing is presented as a promising solution-however it has not been studied sufficiently. This paper explores floating housing as urban climate experimentation, targeting vision/motivation, practice and upscaling in a national context where support mechanisms and traditions are absent. Interviews with innovation entrepreneurs and municipal planners involved with planning and building floating districts show that, with one exception, the Swedish initiatives are at odds with the theoretical assumptions behind urban climate experimentation. Initiatives are neither challenge-led in terms of climate risk nor inclusive and community-based. Rather, the small-scale private entrepreneurs are pioneers in offering unique living on water as one-off innovations. While allowing experimentation, municipal planners are less convinced by the effectiveness and appropriateness of upscaling. Floating housing may contribute to local identity building and place marketing, but are riddled with implementation challenges regarding shoreline protection, privatization/accessibility, limited market interest and urban development fit. While the floating houses themselves withstand flooding, thus safeguarding individual house owners, they do not protect the land-based city with its vulnerable waterfront development patterns. Results thus suggest the limitation of floating houses in shifting development pathways and strengthening urban climate proofing.