Sustainability Report

Embodied carbon reduction is primarily achieved through material selection and structural strategy. The building relies on a mixed wood–concrete system, combining a concrete structure for strength and thermal inertia with a timber structure for lightness and reduced environmental impact. Approximately 500 m³ of Douglas fir, sourced from the Massif Central, is used for the structural timber elements, significantly lowering emissions compared to an equivalent all-concrete solution.

Interior fittings are largely bio-based and PEFC-certified, using a range of European wood species. The reuse of existing furniture from previous facilities, following a reuse diagnosis, further reduced the need for new material production. While no quantified life-cycle carbon assessment is available, the material choices and reuse strategy position the project clearly below standard embodied carbon benchmarks for office-type buildings.

Operational energy demand is addressed through a low-tech, bioclimatic approach rather than complex mechanical systems. The building operates without air conditioning, relying on natural ventilation, triple-glazed facades, projection blinds, roof overhangs, climatic wells, and a vegetated roof to manage comfort across seasons.

A large central bioclimatic atrium acts as a thermal buffer and daylight distributor, reducing reliance on artificial lighting and mechanical heating. Summer solar gain is moderated by photovoltaic panels integrated into the glazed roof, which also contribute to on-site electricity production. These strategies collectively reduce operational emissions and align with Paris climate objectives without increasing system complexity or long-term maintenance burdens.

Service and maintenance emissions are limited through robust material choices and system simplicity. The absence of air-conditioning systems significantly reduces long-term maintenance needs, refrigerant-related emissions, and replacement cycles. The use of durable materials—exposed concrete, timber structures, and bio-based interior elements—supports long service life with minimal intervention.

Flexible interior layouts and movable micro-architectures reduce the likelihood of heavy refurbishment during future program changes, further lowering emissions associated with maintenance and fit-out renewal.