Citroën Rennes la Janais factory: The history of a legendary industrial site

The journey through the industrial network of the brand with the double chevron continues. After exploring the roots and innovations of the legendary Quai de Javel in central Paris, our summer series heads west toward Brittany. It is here, in the Ille-et-Vilaine region, that a monument of French automotive manufacturing stands proud: the Rennes la Janais factory. Since it opened its doors at the very beginning of the 1960s, this strategic production plant has become an inseparable part of the brand’s identity. With more than 10 million vehicles rolled off its assembly lines, Rennes la Janais has given birth to iconic cars that deeply influenced the global automotive landscape and accompanied the daily lives of millions of drivers worldwide.

The genesis of a giant: Why Citroën chose brittany

By the late 1950s, Citroen faced a major challenge: its historical Quai de Javel plant in Paris was completely saturated. Landlocked in the heart of the capital, the Parisian factory lacked the physical space required to modernise its infrastructure and boost production rates to meet skyrocketing demand during the post-war economic boom. To bring its upcoming mass-market models to life, management desperately needed a vast, modern greenfield location.

The choice of Brittany, and specifically the outskirts of Rennes, was highly strategic. It aligned perfectly with the industrial decentralisation policy championed by the French government to revitalise rural provinces and curb over-concentration in Paris. Brittany, which was predominantly agricultural at the time, offered a large, dedicated, and resilient local workforce eager to transition into industrial employment. Public authorities and local officials quickly mobilised to secure a massive plot of land spanning over 200 hectares in Chartres-de-Bretagne.

Groundbreaking and construction work began in earnest in 1958. The scale of the project was monumental, giving rise to one of the most advanced automotive facilities in Europe, engineered to handle the complete manufacturing cycle from initial metal stamping to final vehicle assembly. On October 15, 1961, the national importance of the complex was officially consecrated: General de Gaulle himself inaugurated the Rennes la Janais site, launching a grand human and technological adventure.

A legendary lineup: From the Ami 6 to the new C5 Aircross

Since its opening, la Janais has served as the cradle for an incredibly diverse range of vehicles, balancing popular mass-market models with highly advanced luxury saloons. Production can be traced chronologically across the decades:

The 1960s: The pioneering era

• Citroen Ami 6 (1961 - 1969): The factory's inaugural model, famous for its reverse-rake rear window, designed to offer superior comfort for middle-class families.

• Citroen Dyane (1967 - 1983): Created to support and modernise the concept of the 2CV, it quickly joined the manufacturing lines in Brittany.

• Citroen Ami 8 (1969 - 1978): The successor to the Ami 6, smoothing out its predecessor's styling lines while retaining a dependable mechanical platform.

The 1970s: Democratising hydropneumatic comfort

• Citroen GS / GSA (1970 - 1986): A massive commercial hit for the facility. The GS brought hydropneumatic suspension and air-cooled flat-four engines to mass production.

The 1980s: Geometric renewal

• Citroen BX (1982 - 1994): The financial saviour of the brand following the creation of the PSA Group, the BX stood out with its sharp angular lines designed by Marcello Gandini for Bertone, alongside its pioneering use of lightweight composite materials.

• Citroen AX (1986 - 1998): The ultra-light and highly efficient supermini was also built in Brittany to help meet immense market demand.

The 1990s: Engineering excellence

• Citroen XM (1989 - 2000): The brand’s advanced flagship, the XM introduced Hydractive suspension, combining electronic computing with traditional hydraulic power.

• Citroen Xantia (1993 - 2002): A family saloon of timeless elegance, it achieved unmatched cornering stability in its Activa variant, which featured an active anti-roll system.

• Citroen Xsara (1997 - 2006): A versatile and practical compact model, showcasing the early stages of industrial platform sharing.

The 2000s: High volumes and presidential luxury

• Citroen Xsara Picasso (1999 - 2010): The brand's first compact MPV, whose spectacular global success translated into exceptional production volumes at Rennes.

• Citroen C5 - First Generation (2001 - 2008): Replacing the Xantia, it carried forward the proud tradition of smooth, long-distance touring saloons.

• Citroen C6 (2005 - 2012): A masterpiece of avant-garde design and automotive technology, this presidential flagship represented French luxury, assembled with craftsmanship precision.

From the 2010s to the Present: The SUV transition and flexibility

• Citroen C5 - Second Generation (2008 - 2017): Available as a saloon and Tourer estate, it offered buyers a choice between conventional steel springs and Hydractive III+ suspension.

• Citroen C5 Aircross (Since 2018): A major shift toward the compact SUV market, introducing Progressive Hydraulic Cushions and spearheading the Citroen Advanced Comfort philosophy.

• The New C5 Aircross (2025/2026): The newest generation, engineered on Stellantis’ modern multi-energy architectures, securing the manufacturing future of the plant.

The economic heart of the west: social and human impact

The establishment of la Janais permanently reshaped the social and economic fabric of the Rennes region. At its historic peak in the late 1970s and early 1980s, the factory stood as the largest private employer in Brittany, with up to 14,000 direct workers on the payroll. The famous phenomenon of the "worker-peasants"—employees who split their days between managing their local farms and working shifts on the assembly lines—left a lasting mark on the region's social history.

Over the decades, industrial shifts, increasing automation on the assembly lines, efficiency gains, and structural reorganisations led to a gradual reduction in headcount. Today, the Rennes la Janais facility employs around 2,000 workers. While this is lower than its historic peaks, the site continues to play a vital role in the regional economy, supporting a vast local ecosystem of automotive suppliers and logistics partners.

Looking to the future: resilience, modernisation, and global ambitions

Rennes la Janais holds a unique status within the European automotive landscape: it is the last remaining 100% Citroen factory operating in France, following the closure of historic sites at Quai de Javel and Aulnay-sous-Bois. This reality gives it immense symbolic and heritage value, making Brittany the last home bastion for the assembly of the brand's larger vehicles.

To safeguard this legacy, Stellantis has committed substantial investments to modernise the facility. Allocating the production of the new C5 Aircross (project code CR3) gives the plant critical industrial visibility. Built upon the state-of-the-art STLA Medium platform, the factory is fully equipped to manufacture electric, hybrid, and internal combustion vehicles on a single line, adjusting dynamically to changing European market trends.

The future outlook also embraces international collaboration. Under Stellantis' global FaSTLAne strategic framework, the Rennes plant could optimise its production capacity by contract-manufacturing vehicles for international partners, such as Dongfeng. This diversification would solidify the plant’s long-term commercial viability while preserving advanced automotive manufacturing skills on French soil.

From the iconic early Ami 6 to today's new C5 Aircross, passing through the memorable BX, Xantia, and luxury C6, the Rennes la Janais factory has shaped an immense chapter of Citroen’s history and heritage. With cumulative production crossing the 10 million unit mark, this manufacturing facility has consistently proven its ability to adapt to technical and economic transformations within the global automotive industry. Though operating at a more compact scale than during its 1970s peak, it remains a vital strategic pillar of French manufacturing and the ultimate custodian of domestic production for the brand’s larger models.