grEEn-campus

The campus architecture creates a seamless interface between the active industrial facilities and the site's new identity along the Seine and within the city. Located close to Poissy's town centre and RER station, the campus is firmly rooted in its urban environment.

The masterplan brings together office buildings, a multi-storey parking facility, an R&D building and a Test Cars building, all organised around major orthogonal axes that follow the site's historic industrial grid. This framework is enhanced by a network of covered streets and a diagonal "lifeline" connecting three key destinations:

• Along the Seine, a landscaped garden created within the former stamping pit and a pavilion formed from the preserved original steel structures;
• At the heart of the campus, the social condenser, directly connected to the dining and amenity spaces;
• At the site entrance, the Arrow Building, a showcase for the campus within the city and an iconic gateway structure featuring a timber frame.

Designed for longevity, the campus will initially accommodate Stellantis activities. Thanks to its flexible and divisible design, it can also adapt to a variety of future occupants and uses over the coming decades.

The R&D building is a large-scale facility measuring approximately 75 by 200 metres, providing nearly 15,000 m² of floor space. It is organised within the existing 12.20 x 12.20 metre structural grid, ensuring a high degree of flexibility for future uses. A spacious atrium marks the main entrance and acts as the central hub for shared facilities. From there, users access a vast testing hall housing technical testing equipment, as well as an upper level designed as a 3,000 m² open-plan workspace. While currently accommodating laboratories, this floor can easily be converted into office space thanks to natural daylight provided by a series of patios.

The Test Cars building, intended to accommodate heavy testing equipment, occupies a section of the B5 building that has been separated from the operational factory. Its design preserves as much of the existing envelope as possible.

The architectural language of the buildings harmonises the site's varied heights through a composition of horizontal bands layered across a metallic grey double-skin steel cladding system. The different cladding profiles create shifting reflections and subtle variations of warm tones that visually connect with the office façades. Interrupted only by the atrium's large glazed curtain wall, which highlights the building's main entrance, the R&D façade is composed of large flat metal panels that fold into diamond-shaped facets around the openings, evoking the sculpted surfaces of an automotive bodywork.

Open and flexible spaces designed to accommodate a wide range of uses

Designed to host up to 3,700 people simultaneously, the campus will serve a workforce of 8,200 employees, many of whom will be present on a part-time basis. The widespread adoption of digital tools and remote working has fundamentally transformed workplace typologies, as offices are no longer destinations employees attend every day.

From the moment they prepare their visit to their arrival on site, users experience a campus in which they actively participate. Bringing together Stellantis' various business units in a single location encourages collaboration and knowledge sharing. A diverse range of spaces can be freely appropriated, whether for focused individual work, collaborative activities or informal interactions. Circulation routes are designed to promote serendipity and foster productive encounters.

Organised around the Social Condenser and connected by a network of covered streets, the office buildings are based on a simple and efficient layout. Service cores located at each end accommodate amenities and personal lockers, freeing up the office floors and maximising flexibility. Each floorplate is divided into two independent sections, enabling future occupancy by different tenants on the same level if required.

Central openings linking pairs of floors incorporate staircases and stepped seating, creating both visual and physical connections between levels. Whether for individual work, teamwork or collective gatherings; whether to focus, collaborate or relax, the office environments support a broad spectrum of activities. Open and enclosed meeting rooms, private offices, phone booths and work cafés coexist within a warm and welcoming atmosphere.

The project transforms the former B5 building into a campus composed of several interconnected buildings, creating a network of outdoor spaces that address multiple objectives:

• Supporting operational requirements by organising the flows associated with the site's various functions, including offices, shared amenities, dining facilities and R&D workshops;
• Providing an attractive working environment that respects the site's unique identity, shaped by both its industrial heritage and its relationship with the Seine;
• Addressing regulatory and environmental challenges, including flood risk management, soil conditions and contamination, stormwater management, and the integration of nature within the urban environment.

By significantly reducing the building footprint compared to the existing site, the campus creates more than 20,000 m² of permeable green space on a site that is currently almost entirely sealed and impermeable.

Low-energy buildings certified E3C2.

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 E3C2 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 structure.