Presentation
« Science without conscience is but the ruin of the soul » François Rabelais
Comprehensive services
Our consulting engineering firm has been providing services in structural, civil and environmental engineering since 1955. We are based in Carouge, Geneva.
Today, under the leadership of Erik Langlo, Julien Treleani and Marc Lachenal, the firm sustains its know-how and its expertise of 60 years, with a record of significant iconic achievements in Geneva in the area of civil engineering, structures and special works. Our environmental specialists are available for assessments on asbestos or any other dangerous substances, thermal balance calculations, environmental monitoring and other assignments.
We are available for simple inquiries as well as for multidisciplinary, highly complex projects. Our services extend over the entire project cycle: identification and feasibility studies, preliminary design, final project, tendering and site supervision.
We have a long tradition as trainers. Our draughtsmen apprentices get professional coaching on which their learning process is based. The variety of projects in which they are involved is conducive to inspiration and fulfilment. We are also welcoming students for short-term internships or practical training during their university curriculum.
Human resources and logistics
Management board:
Marc Lachenal, Erik Langlo and Julien TRELEANI
- Marc Lachenal, MSc civil engineering EPFL/SIA
- Erik Langlo, MSc civil engineering ETH/SIA
- Julien Treleani, MSc civil engineering EPFL/SIA
Staff: 40
- Management 3
- Civil engineers 14
- Environmental engineers 3
- Draughtsmen 10
- Site supervisors 3
- Administration 5
- Apprentice 1
- Trainee 1
Facilities
- More than 1'000 m2 office space in Carouge, Geneva, close to the motorway
- Cozy cafeteria
- 3 company cars
- 2 bicycles
- 10 languages: Français, Deutsch, Italiano, English, Español, Português, العربية (Arabic), Norsk, Svenska, Dansk
In the headlines
Key dates
| 1955 | Foundation of the firm R. PERRETEN, simple partnership |
| 1956 | The firm is renamed R. and C. PERRETEN, simple partnership |
| 1964 | The firm is renamed R. and C. PERRETEN & P. MILLERET, simple partnership |
| 1978 | The firm is renamed PERRETEN & MILLERET, public limited company. |
Firm partners over time (1955-2015)
| Period: | Partners: |
| 1955 | Roger Perreten, founder |
| 1955 - 1963 | Roger Perreten and his brother Claude Perreten |
| 1964 - 1981 | 1964: Pierre Milleret becomes a partner Roger Perreten, Claude Perreten, Pierre Milleret |
| 1982 - 1988 | 1982: Jean-Yves Duchêne and Erik Langlo become partners Roger Perreten, Claude Perreten, Pierre Milleret, Jean-Yves Duchêne, Erik Langlo End 1988, Claude Perreten leaves the firm |
| 1989 - 1999 | Roger Perreten, Pierre Milleret, Jean-Yves Duchêne, Erik Langlo 1999-2000 Roger Perreten and Pierre Milleret leave the firm |
| 2000 – 2004 | 2000: Serge Dal Busco joins the firm as partner Jean-Yves Duchêne, Erik Langlo, Serge Dal Busco End 2004: Jean-Yves Duchêne leaves the firm |
| 2005 - 2013 | 2005: Julien Treleani joins the firm as partner Erik Langlo, Serge Dal Busco, Julien Treleani End 2013: Serge Dal Busco, elected to the Geneva Government, leaves the firm |
| 2014 | Erik Langlo, Julien Treleani |
| As from 1.1.2015 | 2015: Marc Lachenal becomes a partner Erik Langlo, Julien Treleani, Marc Lachenal |
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