grEEn-campus

The R&D building is a large, flexible volume measuring approximately 75 x 200 meters, or 15,000 m² at ground level, developed within the existing structural grid of 12.20 x 12.20 meters, allowing for a wide range of uses. A large atrium marks its entrance and connects to the shared spaces. It leads to a spacious hall housing testing equipment, and to an upper floor designed as a vast open space of over 3,000 m²: hosting laboratories, it can easily be converted into office areas thanks to natural lighting provided by patios.

The Test Cars building, intended to accommodate heavy testing equipment, is set up in a section of the B5 building that is isolated from the active factory, with maximum preservation of the existing envelope.

The architectural expression of the buildings unifies the site's varied heights through a layout of horizontal bands intersecting a double-skin metallic grey steel cladding. The varied cladding waves create a play of reflections and a warm tonal vibration that harmonizes with the office façades. Interrupted only by the large glazed curtain wall of the atrium marking the building’s main entrance, the cladding of the R&D building consists of large flat panels that, like a car body, taper into diamond-shaped points at the openings.

The project replaces the single B5 building with a series of buildings organized as a campus, creating outdoor spaces with multiple purposes:

• Meeting functional requirements by organizing flows related to different functions (offices, shared spaces, dining areas, R&D workshops, etc.);
• Providing an attractive working environment while respecting the site's strong identity, particularly its connection to the Seine and its industrial heritage;
• Incorporating responses to regulatory constraints and environmental challenges (flood risk, soil conditions and pollution, stormwater management, urban greening, etc.).

By significantly reducing the buildings’ footprint compared to the current state, the campus creates over 20,000 m² of open ground on a site that is currently almost entirely impermeable.

Low-energy buildings certified E3C1.

The project’s primary strength lies in reducing the site's real estate footprint, decreasing built-up areas in favor of green spaces, while preserving existing industrial steel structures wherever possible.

Stellantis aims for operational carbon neutrality in its tertiary buildings, ensured by an energy performance contract: the offices’ regular energy consumption is offset by the rooftop photovoltaic panel production.

The project’s E3C1 certification also covers the construction’s carbon footprint. The concrete post-and-slab structure of the office buildings was fully prefabricated off-site by GA Smart Building, as were the timber-frame façades delivered with mixed wood-aluminum joinery, and the timber-frame sanitary modules delivered finished in sync with the structural work. The absence of continuous suspended ceilings and the use of exposed technical systems in the offices reduce material usage while enhancing spatial volume and user comfort.