On the edge of Rennes and Saint-Jacques-de-la-Lande, a new office project by Alta Architectes demonstrates the power of materials to shape future cities. Built primarily from timber, this low-carbon development champions biobased construction and environmental integration. From structural timber and natural zinc to anodised aluminium and permeable concrete, the building tells a story of sustainable innovation and material consciousness.
The site, once used for market gardening, now offers space for renewal. Alta Architectes responds with two three-storey timber buildings above a shared underground parking level. Their design respects the local scale while addressing broader urban needs.
Material choices play a central role. The structure consists of 80% timber, sourced from responsibly managed forests with PEFC and FSC certification. Timber frames and cross-laminated timber (CLT) floors form the core. Steel beams support the interior structure, maximising ceiling heights. Concrete is used sparingly—for the foundation and circulation shafts only.
The materials do more than reduce environmental impact—they shape how people experience the space. Spruce clads the façades and vertical elements, offering warmth and texture. Natural anodised aluminium adds subtle detail to windows and railings. Zinc on the roof and rainwater downpipes provides both durability and visual balance. At ground level, permeable concrete and porcelain stoneware help manage stormwater and link the building to the surrounding site.
Each material supports long-term performance. Timber regulates humidity and provides thermal and acoustic comfort. The natural finishes create healthy, calm interiors—ideal for work environments.
This project meets ambitious environmental goals. It is targeting NF HQE certification for tertiary buildings, BBCA low-carbon labelling, and E1/C1 performance standards. The site includes 170 parking spaces, several with electric vehicle chargers, and secure bike storage. These features promote soft mobility and reduce the project’s overall footprint.
Building services are cleverly concealed within the roof. This approach maintains clean lines and avoids visual clutter, reinforcing the architecture’s clarity and simplicity.
Alta Architectes proposes a new way of thinking about office design. This project moves beyond generic solutions. Instead, it puts materials, sustainability, and user comfort first. The result is a building that reflects both environmental responsibility and architectural vision.
For architects and interior designers, the project offers a strong example of how biobased and circular materials can transform commercial spaces.
Source: ALTA
Photos: G. Chevrier