This article explores the GreeNest project’s mission to revolutionize sustainable construction by integrating biogenic materials, renewable energy systems, and innovative smart envelope designs. With solutions like the EcoTechWall, Heat-Harvest Window, and GreenWall, the project aims to cut embodied carbon emissions by 50% and operational emissions by 60%. By emphasizing circular design, digitization, and local supply chains, GreeNest supports EU climate goals, creating adaptable, low-emission buildings that enhance comfort, biodiversity, and energy efficiency across Europe.