Building insulation is Germany's underrated climate infrastructure — VARM closes €17.5 million Series A

“Heat transition efforts fail less because of technology than because of execution.” VARM’s AI platform and a growing network of trade firms turn insulation into scalable infrastructure — a single-family home, insulated in one day at a fixed price — on the way to one million buildings across Europe by 2035.

BERLIN, June 23, 2026 — VARM GmbH has closed a €17.5 million Series A financing round. The Berlin-based company insulates single-family homes in one day at a fixed price and builds the execution capacity behind it through its own training program and a network of established trade firms. The round is led by ABN AMRO Sustainable Impact Fund, with GET Fund as co-lead. Aurum Impact joins as a new investor, alongside existing investors Emerge, Pale blue dot, and noa.

Millions of buildings, skills shortage, no scalable model

Germany must retrofit millions of homes, but the trades cannot scale. A business model that can bring retrofits nationwide is missing. The traditional trades market is fragmented, opaque, and paralyzed by a shortage of skilled labor. Energy consulting portals broker jobs but do not execute them. General contractors coordinate third parties without building their own execution capacity.

Christian Grüner, CEO and Co-Founder of VARM: “In the next ten years we must upgrade high-emission buildings to become energy-efficient. The most effective way to do that is insulation. Scaling in this area is therefore an infrastructure task.”

VARM’s partner program as the operational backbone

At the core of VARM's model is its partner program: established trade firms — painters, drywall installers, building services technicians, and related trades — add insulation to their offering and run it within their own company, backed by VARM's software, processes, and lead access. VARM trains their crews on its own insulation method and shares the operating standard it has refined across thousands of jobs; where firms want to grow faster than the trade can supply, it also brings in qualified career changers from adjacent professions. VARM does not wait for the scarce pool of skilled labor — it builds and equips its own.

The model works like a decentralized production infrastructure, orchestrated by VARM’s AI platform — the system partner businesses run their projects on. The platform manages every step: automated measurement capture, material quantity calculation, and in-field quality assurance. The result: a single-family home can be insulated in one day. A typical project costs around €5,000; with BAFA funding, the homeowner’s out-of-pocket share is less than €4,000. Residents then save up to 50% on heating costs. The investment pays back in full after four to seven years.

No compromises on quality

Every month, hundreds of homeowners in Germany insulate their homes with VARM. Since its founding in 2023, VARM has completed thousands of projects — with a Google rating of 4.9 out of 5 stars based on hundreds of verified customer reviews. The company operates 7 locations in Berlin, Hamburg, Bremen, Essen, Cologne, Frankfurt, and Minden.

“In the retrofit market, demand is not the problem — execution is. Brokerage models don’t solve that. VARM trains its insulation specialists itself, building the capacity the market lacks. That takes longer, but it is the more resilient path if a German model is to become European retrofit infrastructure.”
— Gaetano Giuffré, Investment Manager, ABN AMRO Sustainable Impact Fund

“What convinced us was not only how fast VARM is growing, but how consistently stable, scalable, and verifiable quality remains. The team has the right understanding of how proprietary technology, a platform, and AI can be used to support skilled trades. This makes technology a job creator, not a job killer.”
— Julian Klaiber, Principal, GET Fund

Taking the model nationwide

The largest share of the new capital goes into the partner program — bringing more trade businesses onto VARM’s AI platform — alongside continued platform development and accelerated expansion across Europe. VARM’s mission is to insulate one million buildings across Europe by 2035:

“From day one, our goal has been to build the infrastructure for the heat transition,” says Christian Grüner. “That’s why we built an AI platform that manages every step from the first customer contact to completed insulation. This enables us to deliver at a speed the market has not been able to achieve to date.”

Why VARM?

VARM is the only company in Germany that combines its own execution standard, a workforce-qualification program, and an AI platform that lets partner businesses deliver insulation at scale. This combination is the core of its competitive advantage and the prerequisite for quality and capacity to scale together.

“Climate action must not be a luxury project. If we can deliver retrofits at a speed and quality that every homeowner can understand and afford, then insulating one million buildings in Europe by 2035 becomes a question of scaling. The heat transition fails less because of technology than because of execution,” says Christian Grüner.

About VARM

VARM is Germany's leading provider of building insulation. Founded in Berlin in 2023 by Christian Grüner and Sebastian Würz, the company builds the technology and infrastructure to run insulation across Europe. Its AI platform manages every project from first measurement to quality assurance, while VARM's qualification program and partner network build the execution capacity the heat transition lacks. VARM operates in seven cities and has completed thousands of projects with a 4.9-star Google rating. The goal: to build the European insulation champion — one million insulated buildings by 2035. VARM is B Corp certified. More at varm.earth.

About ABN AMRO Sustainable Impact Fund

ABN AMRO Sustainable Impact Fund (SIF) is a EUR 500 million investment fund backed by ABN AMRO Bank. It invests in companies with a proven track record of driving positive impact, with the goal of accelerating the transition to a sustainable, low-carbon economy while generating financial returns.

About GET Fund

GET Fund invests in scalable climate technologies in Europe with a business-model-first approach. The focus is on proven go-to-market strategies, robust unit economics, and realistic exit pathways. The team’s track record spans 15 years of cleantech investment experience, including exits such as sonnen (acquired by Shell) and Luxexcel (acquired by Meta). GET Fund supports founders with hands-on operational experience in scaling climate solutions that work in real industrial environments.

About Aurum Impact

Aurum Impact is the impact investing vehicle of the Goldbeck Family Office. Aurum Impact invests in startups and funds tackling major environmental and social challenges, with a focus on Climate & Energy, Circularity & Materials, Natural Ecosystems, and Stable & Equitable Societies. The portfolio comprises more than 15 companies and over 20 funds, including startups such as Cyclize, Voltfang, Paebbl, and BEO; and funds such as Revent, Planet A, Visionaries Tomorrow, Voyager, and Breakthrough Energy Ventures.

Press contact
Christian Grüner, CEO & Co-Founder
[email protected]