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Since its creation in 1979 under the name Fernando Herrera, then Ott et Uldry Sàrl, and now OU3 SA, our engineering firm has always placed people at the heart of its business. Now led by John Wuest, Vivien Duhem Khojoyan, and Yannick Mathieu, we are a close-knit and passionate team, dedicated to innovation and continuous improvement.
We firmly believe that the success of our projects depends on close collaboration and listening carefully to our clients' needs. Our commitment to creating a harmonious working environment promotes team cohesion and enables us to achieve an excellent technical level.
At OU3 SA, we are committed to offering innovative and customized solutions, while striving for continuous improvement in our practices. Join us to benefit from our expertise and collaborative approach, and together, let's bring your projects to life with efficiency and sustainability.
Structural Engineering
New buildings, elevations, conversions, restoration of protected buildings, energy improvements.
- Structural Design
- 3D modeling, analysis, and calculation
- Material optimization, sustainable approach, and promotion of reuse
- Preparation of calls for tenders, financial management
- Project execution and monitoring of works
Civil Engineering
- Design and construction of structures
- Roads
- Outdoor development projects – public and private spaces
- Design, coordination, and management of networks, services, and sanitation
- Stormwater management techniques
- Special works, civil engineering: micro tunnel boring, directional drilling, covered trenches, excavation shoring, etc.
- Feasibility studies
- Calls for tenders
- Execution and monitoring of works
Works management
- Site Supervision
- Project management
- Quality assurance
Opening times
- Monday7:30 to 12:00 / 13:30 to 18:00
- Tuesday7:30 to 12:00 / 13:30 to 18:00
- Wednesday7:30 to 12:00 / 13:30 to 18:00
- Thursday7:30 to 12:00 / 13:30 to 18:00
- Friday7:30 to 12:00 / 13:30 to 18:00
- SaturdayClosed
- SundayClosed
Rating 5 of 5 stars
Opening times
- Monday7:30 to 12:00 / 13:30 to 18:00
- Tuesday7:30 to 12:00 / 13:30 to 18:00
- Wednesday7:30 to 12:00 / 13:30 to 18:00
- Thursday7:30 to 12:00 / 13:30 to 18:00
- Friday7:30 to 12:00 / 13:30 to 18:00
- SaturdayClosed
- SundayClosed
- Telephone:
- E-Mail:
- Website:
Reviews for OU3 SA
- English,French,German
- Building condition analysis,Utilisation analysis
- Building construction,Building management,Civil engineering,Concrete construction,Conversion, renovation and refurbishment,Demolition & dismantling,Woodwork
- Planning & Coordination
- Civil Construction,Construction Damage Analysis,Construction Preservation,Engineering Surveying,Excavations,Infrastructure Construction,Material Technology,Property Drainage,Railway Construction,Renovation,Road Construction,Steel Construction,Structural Dynamics (Seismic Safety),Subsurface Construction,Timber Construction
- Concept development
- By telephone,Online
- Close to public transport,Parking site,Wheelchair-accessible
- Detailed planning,General planning
- Client Support,Construction Supervision,Consulting,Cost Control,Design,Expertise,Feasibility Studies,Planning,Tendering and Bid Comparisons
- Categories
- Engineering firmsEngineeringPlanning