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Specialist in steel construction

Founded in 1963 near Le Puy-en-Velay, GAGNE has continued to develop its skills and is now one of the largest French metal manufacturers.

Thanks to the expertise of its design office, the performance of its production facilities and the expertise of its works teams, GAGNE has become a reference for the realisation of your projects, from the simplest to the most complex.

GAGNE’s role in metal construction is focused on the building industry, bridges, car parks, process structures, renovation and facades/canopies.

GAGNE offers expertise for the construction of bridges and footbridges, railway stations, stadiums, shopping centres, sports halls and projects with a high degree of technical complexity and on operational sites.

GAGNE is also available in the Auvergne-Rhône Alpes region for industrial, commercial and tertiary sector projects.

GAGNE combines all the skills necessary for the successful execution of the project:

  • Design and drafting: more than 50 highly qualified engineers and technicians carry out estimates, calculations and execution drawings, as well as studies of specific assemblies such as launches, hoisting and rigging of structures.
  •  Manufacturing: 18,000m² of factories adapted for the production of large parts in welded steel beams and traditional carpentry.GAGNE has a methods office and expertise in non-destructive testing of welds.
  • Anti-corrosion protection: a dedicated surface treatment unit, affiliated with the Office for the Approval of Industrial Paint Guarantees [OHGPI]with personnel certified by the Association for Certification and Qualification in Anticorrosive Painting [ACQPA], is able to carry out complex systems with a guarantee.
  • Works: more than 50 employees: works managers, site supervisors and fitters throughout France. GAGNE, which is MASE certified (focusing on the improvement of safety in the workplace), has a team that is particularly aware of safety and environmental issues, and operates on constrained sites, in urban or industrial environments.


Steel structure
Metal glass
production plants
of steel delivered/month

Our approach to sustainable construction

construction durable
Optimisation of structures to reduce the amount of material
Practical reversible building solutions designed for reuse
Metal, wood, concrete: the right material in the right place for more energy efficiency
usine picto_Plan de travail 1
Wide use of prefabrication for more circularity in our constructions
batiment circualaire
Numerous success stories in the renovation of structures
analyse cycle vie - picto
Project life cycle analysis integrated into the price offer

Your needs
our projects


From the simplest to the most complex designs

Gagne showcases its expertise on all types of projects, from the simplest to the most complex, in the field of steel structures, roofing and cladding, bridges, glass-metal facades and constrained environments.


Gagne certifications

  • Qualibat 2414 steel constructions and structures superior technicality
  • Qualibat 2513 bridges and rigid walkways superior technicality
  • Certibat ISO 9001 Certification
  • NF EN 1090-2 Standard: execution class EXC4
  • MASE: ‌Corporate Safety Improvement Manual (2014 standard)
  • SNCF professional qualifications: 02421 and 02431



By your side

With national and regional locations, the GAGNE teams operate throughout France and accompany clients abroad.

Contact us directly by clicking on the map.

Have a project?

Our experts will provide you with an answer adapted to your needs as soon as possible.

Contact us from:
8.00 AM to 5.30 PM
Monday to Friday