Visibuilt Raises $3.6M for Mycelium-Based Paving

Jan de Vries · 2026-07-13

Visibuilt, a Danish biotech company that makes bio-based alternatives to carbon-heavy construction binders, just closed a $3.6 million Seed round. The money will help them move from lab experiments to real-world tests and market validation. ### Who's Backing Them The round was co-led by EIFO and Unconventional Ventures, with help from Proptechfonden and returning investor EMDFonden. It's a strong vote of confidence for a company that's still early in its journey. "Closing this Seed round is an important milestone for Visibuilt," says Line Kloster Pedersen, CEO and co-founder. "It enables us to mature our technical platform, validate our solution at a larger scale, and take the next steps towards the market."  ### The Bigger Picture Visibuilt's raise is part of a larger wave. According to EU-Startups, companies working on low-carbon, bio-based, or circular construction materials pulled in about $34.6 million in disclosed funding during 2026. That includes: - Carbonaide (Finland): $4 million for CO2-curing tech - Co-reactive (Germany): $7 million for CO2 mineralization - Cocoon Carbon (London): $14 million for cement substitutes from steel slag - Mykor (Bristol): $5 million for biotech construction materials - Circular11: $2.9 million for waste-based products - MAECONOMY: $1.6 million for circular-material infrastructure Add Visibuilt, and the total hits roughly $38.2 million across these announcements. ### Why It Matters "Concrete and asphalt production are among the largest sources of CO2 emissions globally," says Sara Sande, Managing Director at EIFO. "If we are to truly reduce emissions, it requires new solutions in heavy industries. Visibuilt has an approach that could become an important piece of that transition." ### How Visibuilt Works Founded in 2022 by Line Kloster Pedersen and Oleksii Rebrov, Visibuilt uses mycelium—the root-like structure of fungi—to create a binder called visiBINDER. It's designed for paving and infrastructure, offering a less energy-intensive alternative that still holds up outdoors. ### What Investors See Thea Messel, General Partner at Unconventional Ventures, explains why they led the round: "At Unconventional Ventures, we look for companies where the impact case and the commercial case are structurally identical. Visibuilt is that company. Every ton of visiBINDER placed in a paving application displaces a ton of fossil binder, generates royalty revenue, and reduces the embedded carbon of the infrastructure it goes into." She adds: "Line has built active industrial testing relationships with Denmark's leading concrete paver manufacturer and Copenhagen Municipality within two years of founding—without a finished production setup and without a fully derisked product. That is an unusual execution signal for a HardTech founder at this stage, and it is why we co-led." ### What's Next The funding will go toward expanding tests, setting up production for larger trials, and hiring more technical and commercial talent. The goal: prove the tech works in real-world applications and get ready for a market launch. If you're watching the sustainable construction space, Visibuilt is one to keep an eye on. They've got the science, the backing, and the hustle to make a real dent in emissions.