If BIM is key to address the construction sector growing technical complexity, to overcome construction processes fragmentation and communication problems between stakeholders, to reduce on-site time and improve quality and affordability, its uptake for the renovation of the EU existing building stock is yet to come and already late. To face this BIM4REN starts from 3 workflows adapted to the construction sector segmentation (90% of companies are SMEs) presenting particular technical and organisational requirements and has adapted the project and consortium to provide adequate and innovative processes, methodologies, software and hardware tools & BIM developments for each one of them, backboned by state of the art BIM technologies like worldwide used BIM Server (open-source) and BIM Bots by TNO among many others. BIM4REN gathers together top European RTOs active in the Built Environment domain (Nobatek, CSTB, Tecnalia, TNO, Fraunhofer ISE) alongside key industrial actors (EDF, CMB Carpi & ATI Project (leading BIM implementers in the EU market) with 2 Universities (RWTH & Vilnius Gedimas) and up to 11 SMEs: R&D performing (R2M, Ekodenge), SME contractors (Kursaal) and technology providers (IES, EnerBIM, WiseBIM, VRM, AEC3, etc.) with the European Builders Confederation, the Green Building Council Italy and a large French Social Housing Organisation (Logirep) representing the whole residential renovation value chain. B4R digital ecosystem will be accessible via a web based One Stop Access Platform, where depending on each user profile and needs, orientation, best practice examples from a dedicated database and links to the different tools and services (from Top-grade to Entry-level) will be provided on differentiated access schemes underpinned by different business models. Inspired by the Open Innovation 2.0 paradigm the project will setup a demonstration campaign with “pilots as Living Labs” integrating all stakeholders in 3 cities (Paris, San Sebastian and Venice).