ALTA Architectes - Urbanistes

Bois Harel Tertiary Complex

BOIS HAREL TERTIARY COMPLEX

ALTA

Bois Harel Tertiary Complex
© Gaëtan Chevrier

ARCHITECTS
ALTA

STRUCTURAL ENGINEERS
Tannacher

MEP CONSULTANT
Fluelec

ENERGY CONSULTANT
Fluelec

ACOUSTIC ENGINEERS
Acoustique Yves Hernot

CIVIL ENGINEER
Ecr Environnement

EXECUTIVE PROJECT MANAGEMENT
Lamotte, Batitech

COST CONSULTANTS
Cabinet Lemonnier

BUILDING CONTROL
QUALICONSULT

HEALTH & SAFETY COORDINATOR
QUALICONSULT

PHOTOGRAPHER
Gaëtan Chevrier

AREA
6920 m²

YEAR
2025

LOCATION
Saint-Jacques-de-la-Lande, France

CATEGORY
Office Buildings

Bois Harel Tertiary Complex
© Gaëtan Chevrier

English description provided by the architects.

Alta unveils an ambitious office project located on the Chemin du Bois Harel, a site undergoing transformation on the edge between Rennes and Saint-Jacques-de-la-Lande.

Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier

Once a market gardening area marked by the Crublé greenhouses, closed in 2004, this reconfigured territory lies between countryside and urban periphery.

To the west, a rural landscape dotted with scattered housing; to the east, the Rennes ring road with its constant flow of traffic. At the intersection of these two contrasting realities, the site provides fertile ground for a new vision of urbanity.

Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier

Alta envisions here a connecting architecture—simple and contemporary—designed to bridge the scale of daily life with that of the broader landscape, while preserving quality of life.

TWO LOW-CARBON BUILDINGS

The project is organized around two three-storey buildings, set atop a shared underground base that houses parking.

Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier

Designed to meet French 5th category ERP standards, the project includes 170 parking spaces, several of which are equipped with electric vehicle charging stations, along with secure bicycle storage facilities to promote soft mobility.

The construction follows an environmentally responsible approach, driven by committed technical choices. The structure is composed of 80% timber sourced from sustainably managed forests, certified PEFC and FSC.

Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier

Concrete is used selectively and only where strictly necessary—for foundations, vertical circulation, and overall structural stability.

The façades are made of timber frame walls, the floors of cross-laminated timber (CLT), while steel beams optimize ceiling heights, offering spacious, light-filled interiors with 2.70-meter ceilings.

Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier

This construction approach ensures a healthy, comfortable, and efficient working environment. Timber, naturally insulating and moisture-regulating, supports excellent indoor air quality and delivers high levels of energy and acoustic performance.

A MATERIAL PALETTE THAT IS SUBTLE, EXPRESSIVE, AND SUSTAINABLE

The design is grounded in durable materials, carefully selected for their appropriateness and their ability to engage with the surrounding landscape.

Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier

Spruce, used for façades, cladding, and vertical elements, adds a warm and lively texture. Natural anodized aluminum provides an elegant, understated finish for windows, railings, and technical components.

Natural zinc, used for roofing and rainwater downpipes, completes the palette with subtlety. At ground level, porcelain stoneware and permeable concrete encourage water infiltration while ensuring material continuity.

Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier

Technical equipment is integrated into the roof and discreetly concealed, preserving the purity of the overall silhouette. The architecture is expressed with sensitivity, integrating seamlessly and thoughtfully into its context.

Alta proposes a new way of thinking about office architecture. Far from stereotypes, the architecture steps back to support the dynamics of the site, reconnect with the landscape, and meet contemporary demands for comfort, sustainability, and usability.

Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier

A committed, restrained, and human vision of urban development resolutely forward-looking.


Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier
Bois Harel Tertiary Complex
© Gaëtan Chevrier


Bois Harel Tertiary Complex
Building A - North Facade
Bois Harel Tertiary Complex
Building A - West Facade
Bois Harel Tertiary Complex
Building A - South Facade
Bois Harel Tertiary Complex
Building A - East Facade


Bois Harel Tertiary Complex
Building B - North Facade
Bois Harel Tertiary Complex
Building B - West Facade
Bois Harel Tertiary Complex
Building B - South Facade
Bois Harel Tertiary Complex
Building B - East Facade


Bois Harel Tertiary Complex
Longitudinal Section 01
Bois Harel Tertiary Complex
Longitudinal Section 02
Bois Harel Tertiary Complex
Cross Section
Bois Harel Tertiary Complex
Partial axo section


Bois Harel Tertiary Complex
Plan - Ground floor
Bois Harel Tertiary Complex
Plan - Basement
Bois Harel Tertiary Complex
Plan - 1st floor
Bois Harel Tertiary Complex
Plan - 2nd floor
Bois Harel Tertiary Complex
Plan - Site


Bois Harel Tertiary Complex
Axonometry (Southwest)
Bois Harel Tertiary Complex
3D section (grayscale)

ALTA Architectes - Urbanistes
T +34 2 99263326
ALTA Architectes - Urbanistes
22 Av. Henri Fréville, 35200 Rennes, France