The building sector faces a major challenge in meeting the climate goals of the Paris agreement in the coming years. Although readily available and cost-effective measures already exist, progress is not on track. The transition is complex and requires changes on multiple levels. Both technical solutions and social changes are needed to realize the transformation of the building stock. Finding technical solutions can be challenging as the existing building stock is diverse and solutions are context-specific. The social challenge lies in getting commitment from residents and access to individual homes. In this dissertation, an integrated, socio-technical approach to this transition is proposed that combines different methods and tools. The approach focuses on providing the information stakeholders need to make informed decisions on low-carbon technologies.