Passive offices and silo car park

Rational architecture, generous common spaces and gardens inspired by the Rennes basin and Brittany's coastline

Situated on the edge of the Courrouze district and facing the Rennes ring road, the project comprises two buildings and a silo parking lot.Its architecture is a proposed response to the challenges posed by the evolution of office buildings and is designed to support open-plan working methods.At the heart of the main building (which houses Arkéa's headquarters), a large atrium allows views to flow from one floor to the next while providing easy natural ventilation.As a meeting place, the corridors are wide and open to encourage informal exchanges between employees. The structurally unobstructed floors are extended outward by threaded balconies that wrap around each level, providing sun protection and ease of maintenance.Connected by cantilevered staircases, these courtyards are also spaces that can be appropriated for seclusion. The volume, marked by horizontal lines, is crowned by a roof that alternates between common rooms, terraces and gardens.The rational volumetry is a response to the urban principles of the district, but also an optimum for the development of a mixed wood-concrete structure, in which each material finds its place according to its intrinsic properties (inertia, load-bearing capacity, carbon weight).

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The landscaping - the alluvial garden at the base of the building, the dry heath garden on the roof, and the bocage garden on the roof of the silo parking lot - is designed to continue the pattern of landscaping established in the neighborhood, providing fresh spaces and places for biodiversity throughout the block.

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We have chosen to favor the use of untreated materials, with a rational use of concrete which, thanks to its inertial qualities, enables the building to aim for remarkable thermal performance. Finally, all facades are treated with the same care. Behind a grid of slender wooden posts, generous openings alternate with solid sections to create interior spaces bathed in natural light.

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Location

Saint-Jacques-de-la-Lande (35)

Client

Bati Armor

Area

10,784 m² (offices); 220-space silo parking lot

Team

ChartierDalix (architecture and landscape), Khephren (structure), Solab (HVAC), Lemonnier (costs), Arcora (facades), CSD (preventionist)

Phase

Under construction, delivery in 2026

Project manager

Mickaël Hassani, Jehanne Bouda            

Mission

Complete excluding DET

Program

office building (lobby, workspaces, cafeteria, events room); silo parking lot (220 spaces); 3rd building (program to be defined by the client), gardens

Certification

HQE Bâtiment Durable, Excellent level, according to the V4.0 standard; BREEAM, Excellent level, according to the BREEAM International New Construction V6 standard; Passiv'Haus

Images

ChartierDalix