At the heart of the Pontchaillou site, Rennes University Hospital continued its transformation by bringing together its administrative functions in a new high environmental performance tertiary building.
The project was carried out by Eiffage Construction in a consortium with our timber subsidiary Savare. It fully embodies the Group's commitment to sustainable, low-carbon and innovative construction.
Wood at the heart of construction
This new building was delivered in May 2024 and inaugurated in June. It extends over six storeys for a floor area of 6,400 m². It offers workspaces designed with user comfort in mind: modular offices, open spaces, meeting rooms and relaxation areas.
The central element of the constructive approach: wood, widely used to reduce the carbon footprint of the project.
The framework is based on:
- 320 m³ of glued laminated timber posts and beams,
- 6,500 m² of CLT (Cross Laminated Timber) flooring,
- 3,770 m² of timber-framed façades.
All these elements were prefabricated in the workshop by our subsidiary Savare, guaranteeing quality, precision and rapid installation on site.
Highly commended environmental performance
The building was awarded the BBCA Excellent rating, the highest distinction for low-carbon construction.
Through the extensive use of bio-based materials (almost 100 kg/m²), including the timber used in the framework, the building already meets the carbon performance thresholds set out in the 2031 regulations.
In terms of energy, the project is 20% below the RE2020 limit, notably thanks to:
- AIR/WATER heat pumps,
- Heat recovery ventilation,
- LED lighting with occupancy detection
- Photovoltaic panels on the flat roof offset annual electricity consumption.
Biodiversity and water management
With a view to preserving living heritage, the existing trees were retained and nesting boxes for local wildlife were maintained.
A garden roof, an open land park and permeable paving complete this approach.
All together, these factors will improve rainwater management.
Key figures for Rennes University Hospital:
- 6,400 m² of net floor area
- 320 m³ of glued laminated timber
- 7,000 m² of CLT floors
- 3,770 m² of timber façades
- 100 kg/m² of bio-based materials
- Five months of design work and 13 months of works
Project participants
- Project owner: Rennes University Hospital
- General contractor: Eiffage Construction
- Timber frame / façades: Savare
- Architect / Engineering: CRR Architecture and Engineering, Oteis
