ACCELERATING TRANSITIONS
Our global expertise allows us to consider every dimension of your project to reduce its carbon footprint. Whether it's renovating occupied housing or energy renovation, we can apply our integrated solutions of efficient systems and renewable energy production.
Developing the potential of your projects
Our comprehensive expertise allows us to consider every aspect of your project to reduce its carbon footprint.
Whether it's residential renovation in occupied buildings or energy-efficient renovation of commercial properties, we can implement our integrated renewable energy production solutions.
Our entities
Energy Renovation of occupied housing
Tertiary Energy Renovation
Renewable Energy
Our key figures
0 M€
revenue in 2025
0
employees
Energy renovation of occupied housing
A key player in the ecological and societal transition, IRIS leverages the historical expertise of the Léon Grosse Group to guarantee a high-performance renovation that places the well-being of residents at the heart of the construction site.
Tertiary Energy Renovation
Horizen supports you in your renovation projects for an environmental transition tailored to your strategy, making your assets efficient and compliant with regulations. We offer a comprehensive service, from feasibility studies to construction work. For multi-site properties, we prioritize buildings to define intervention priorities.
Renewable Energy
Voé offers a standardized biomass heating solution that provides customers with renewable, low-carbon heat produced locally.
Our expertise
Transition financing
We have brought together the skills in CEE valorization, grant research and third-party investment to offer you high-performance solutions that include financing.
Law carbon expertise
Our Low Carbon team centralizes cutting-edge expertise (LCA, QEB, PEMD, ...) to capitalize on the best solutions, develop ambitious proposals and enable real scaling up across all our activities.
Consulting
To offer turnkey solutions, we have integrated skills across the entire value chain, enabling us to be a source of recommendations and decision-making support for our clients.
