Seed · Climate Tech · Berlin, Germany · Founded 2024 · 10–15 employees
WALLROUND is a Berlin-based proptech startup that digitizes energy-efficient building renovations through a full-stack platform combining AI, project management, and craftsmanship. Founded in 2024 by serial entrepreneur Lukas Steinhilber (who previously scaled Vehiculum to €300M GMV), the company targets private landlords and institutional investors with end-to-end renovation services from planning to quality assurance. They raised €4.2 million in seed funding in August 2025 led by Revent, with participation from major players like Vonovia (Europe's largest landlord), GGF, and Founders Factory. The company aims to build Europe's largest energy renovation franchise, addressing the critical gap where only 0.7% of buildings are renovated annually despite needing 2.5% to meet 2045 climate goals.