The adoption of innovation in the buildingsector is currently too low for the ambitious sustainability goals that our societies have agreed upon. The concept of smart building, for instance, is being implemented too slowly. One of the main reasons for this is that technologies have to be proven effective and reliable before being introduced at large scale in buildings. Testbeds and demonstrators are seen as a crucial infrastructure to test and demonstrate the impact of solutions in the building sector and hence facilitate their adoption in buildings. The KTHLive-In Lab is a platform of building testbeds designed to this scope. This work describes the Live-In Lab vision,approach, technical features,provides an overview on the multidisciplinary projects that it has enabled and discusses its replicability.