WALLROUND, a Berlin-based startup aiming to digitise and streamline energy-efficient building renovations, 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.
The company was founded in 2024 with a bold vision: to tackle the renovation sector’s outdated and fragmented processes, particularly in the property portfolios of private landlords and institutional investors. WALLROUND offers a full-stack renovation service that brings together property analysis, planning, procurement, construction and quality assurance into a single, tech-enabled platform.
The new funds will be used to expand across Germany, automate planning workflows, and grow the team in key areas including tech, operations and product development. The company also announced the formation of an advisory board, joined by Kai Enders, former DACH CEO of Engel & Völkers, founder of GvFC Immobilien, and long-time president of the German Franchise Association.
“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.
With increasing pressure on real estate owners to reduce emissions, the demand for energy-efficient upgrades has never been higher. Yet, many of the processes remain manual, slow and expensive. WALLROUND’s platform-based approach simplifies renovations, enabling landlords to decarbonise their properties while boosting profitability and staying ahead of regulatory risks.
“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 target market includes a largely underserved segment: private landlords and institutional investors, who collectively hold a significant portion of Germany’s residential housing stock. By consolidating and digitising renovation efforts, WALLROUND aims to address the inefficiencies that slow energy transitions across the sector.
“Building renovation is an opportunity to create meaningful impact while building a massive business,” said Friedrich Neuman, Partner at GGF. “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.”
Backers in this round include 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 is positioning itself to lead the charge with a model that merges scalable tech with on-the-ground execution.
Read the orginal article: https://www.eu-startups.com/2025/08/berlin-based-wallround-secures-e4-2-million-to-digitise-and-streamline-energy-efficient-building-renovations/
