Building responsibly
As an actor of the construction industry since 1881, we are committed every day to developing the profession of builder. It's a necessary vocation if we are to provide the city and its residents with high-quality, responsible and sustainable buildings.
Our activities
Local agencies
For all your new construction or rehabilitation projects
Major Projects
For your large-scale projects
Facility Services
For all your daily works
Public Works, Civil Engineering & Nuclear
Specialized Activity
For your interior design our climatic engineering
We cultivate a committed approach to construction
Driving your project
As a true pilot at the helm, we put our expert teams and in-house production at the service of the complexity of your project. As a trusted partner, we believe that the key to joint success lies in transparency and communication throughout the collaboration.
For value creation
Our teams share your objectives. At every stage, we combine our expertise to ensure that your project's budget is under control, that it is built to the highest quality, that it is environmentally efficient and that it has value for money.
And the human adventure
For 140 years, the quality of our collaborations has reflected the values we advocate. Their recurrence over time is both a testament to the bond of trust that binds us to our customers and a source of great pride.
Our key figures
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Foundation of Léon Grosse
0 M€
revenue in 2025
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locations
0
employees
A single point of contact
As the decision-maker in his or her field, he or she is responsible for ensuring that your project runs smoothly. He or she is the link between the commercial relationship and delivery.
Technical expertise
Wherever you are and whatever the type of project, our organization enables you to capitalize on all the company's know-how. Business and product committees ensure that expertise is passed on.
A local base
Our regional organization provides you with a close relationship. Our knowledge of the players and partners guarantees the responsiveness and flexibility of a human-scale structure.
Low-carbon design
Our employees receive ongoing training on regulations, new technologies and materials. To reduce your carbon footprint, we offer our own solutions in bio-sourced materials, renewable energies and technical systems.
Feminization
We are pursuing an ambitious approach to gender equality in the workplace. Both an ideal and a powerful performance driver, we are enriching and bringing a new perspective to the profession by making our businesses more accessible to women.
Security
We offer everyone working conditions compatible with safety and well-being, particularly on construction sites. The digitalization of tools, training and awareness-raising programs have led to a steady decline in accident rates.
Authenticity
Because each individual creates a unique story, we encourage simplicity in relationships. We create a friendly working environment with all our stakeholders.
Accessibility
The strength of our human-scale organization lies in the ease of access to management and the resulting agility in handling your project. Whatever the size of your project, our team is always ready to listen.
Transparency
Convinced that communication is a key factor in the success of your project, we keep you informed of every detail. A perfect understanding in the service of a privileged spirit of partnership.
Our locations
Dedicated teams
Our centralised management structure and our regional, local (such as our functional works agencies) and specialist (such as SNEP, our agency specialising in vineyard construction) agencies mean that we can be at your side for all types of work. With our dedicated teams and a single point of contact for each project, we're always ready to listen to your needs.
Our fundamentals
Operational and technical mastery—encompassing budget control, scheduling, and safety—is the prerequisite for every one of our interventions.
It is upon this solid foundation that we build our competitive edge: by activating three concrete levers to lastingly transform the construction sector: social inclusion, carbon footprint reduction, and a preference for local supply chains.
Social Inclusion
Driven by our goal to reach 15% of social inclusion hires by 2030, the group is systematizing this approach.
Carbon Footprint
We have structured our strategy around a major ambition: to integrate a low-carbon, quantified alternative into 100% of our bids by 2030.
Local Purchasing
A construction site is an engine for local vitality. It is our responsibility to transform every project into an opportunity for regional economic players.
Certifications
Awards
Our references
Join us
Leon Grosse, a company on a human scale
Take a look at our job offers and apply!
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