Berlin-Based WALLROUND Secures €4.2M to Digitise Energy-Efficient Building Renovations

Berlin-based startup WALLROUND has raised an oversubscribed €4.2 million seed round to fuel its mission of building Europe’s largest energy renovation franchise. The round was led by early-stage venture firm Revent, with participation from GGF and continued support from existing investor Vonovia, Europe’s largest landlord.

Founded in 2024, WALLROUND tackles the renovation sector’s outdated and fragmented processes, particularly targeting property portfolios of private landlords and institutional investors. The company offers a full-stack renovation service that consolidates property analysis, planning, procurement, construction, and quality assurance into a single, tech-enabled platform designed to address inefficiencies in the energy transition sector.

“We’ve watched the energy renovation space for a long time. But WALLROUND is the first team we’ve seen to combine an end-to-end tech solution with operational excellence. This is what the future of renovations looks like,” said Dr Lauren Lentz, General Partner at Revent. The funding comes as real estate owners face increasing pressure to reduce emissions, driving demand for energy-efficient upgrades despite many processes remaining manual, slow, and expensive.

The new capital will support WALLROUND’s expansion across Germany, automation of planning workflows, and team growth in technology, operations, and product development. The company has also formed an advisory board featuring Kai Enders, former DACH CEO of Engel & Völkers, founder of GvFC Immobilien, and long-time president of the German Franchise Association, adding significant industry expertise to guide the platform’s development.

“Our goal is to simplify renovations to the point that anyone can decarbonise their building – profitably,” said Lukas Steinhilber, CEO and Co-founder of WALLROUND. “We’re not just offering a service; we’re building a scalable system that can meet the massive demand ahead.” The company’s platform-based approach enables landlords to decarbonize properties while boosting profitability and staying ahead of regulatory risks.

Friedrich Neuman, Partner at GGF, emphasized the market opportunity and timing. “Building renovation is an opportunity to create meaningful impact while building a massive business,” he said. “WALLROUND’s vision to build Europe’s largest renovation franchise comes at a pivotal moment, helping landlords and investors avoid stranded assets. Their full-stack approach, with software at its core, unlocks significant efficiencies and sets the stage for WALLROUND to accelerate the built environment’s energy transition.”

The funding round included backing from Revent, GGF, Vonovia, KVL Group, Founders Factory, S&B Capital, Micro-VC Superangels, and angel investor Marc Müller. With energy renovation gaining strategic importance across Europe, WALLROUND positions itself to lead the sector transformation through a model that merges scalable technology with on-the-ground execution, targeting the largely underserved segment of private landlords and institutional investors who collectively hold significant portions of Germany’s residential housing stock.