The European Commission’s efforts to design effective policies for buildings, following the 2050 strategy and the European Green Deal, hinge on detailed knowledge about Europe’s building stock. The EU H2020-funded BUILTHUB project will define a roadmap and vision for a durable data flow to document the EU building stock. It will develop an organised and inclusive data collection method and an easy-to-access-and-use datahub to ensure the long-lasting data flow through a benefits-based engagement strategy addressing data and metadata providers and simple users. The 4-year lasting project kicked-off on 7&8 October 2020 through a virtual meeting. Sympraxis Team is lead partner for developing the Platform business case for exploitation and sustainability.