Decarbonising Europe's building stock effectively in line with the EU's 2050 strategy and the European Green Deal depends on the data and knowledge available to European to local authorities and decision-makers for designing targeted frameworks and policies that take into account real-life building stock features and performances. The BuiltHub project seeks to make more comprehensive data on the EU building stock available by developing a structured and inclusive data collection approach accessible in an easy to use we-based datahub platform. Based on state-of-the-art machine learning algorithms and existing data sets as well as individual data providers, the platform will be able to analyse date to provide platform users and data providers with tailor-made information services to support informed decision making towards sustainability.