New Construction

  • Building Type : Other building
  • Construction Year : 2014
  • Delivery year : 2015
  • Address 1 - street : ZA Saint Eustache 35460 SAINT ETIENNE EN COGLèS, France
  • Climate zone : [Cfc] Marine Cool Winter & summer- Mild with no dry season.

  • Net Floor Area : 301 m2
  • Construction/refurbishment cost : 1 160 000 €
  • Cost/m2 : 3853.82 €/m2

Certifications :

  • Primary energy need :
    28.83 kWhep/
    (Calculation method : RT 2012 )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

The result of an intense partnership between all the players in the territory, ECOBATYS, the Ecoconstruction performance center, is an exemplary building: carbon-efficient, using eco-materials and renewable energies. Passive level, it integrates the end of life of the building using 90% of recyclable materials.

Société Coopérative d'Intérêt Collectif, Ecobatys aims to develop actions dedicated to eco-construction, the energy transition and the move towards a more carbon and resource-efficient economy for the various players in the territory. These actions to strengthen and develop collective skills are defined by the implementation of training, support for territorial projects, linking, leasing of spaces and pooling of materials, communication and communication activities. 'event planning...

Sustainable development approach of the project owner

In order to carry out this project, the Client wished to set up an innovative approach that would enable the design of the project in a collaborative mode (PCI approach: integrated design process). 6 days workshops have been organized, bringing together all the actors to compare their ideas, their knowledge and their points of view which are different approaches of the same building: client, users, architect, Studies, companies ... According to the architect Sofia MELAH, the PCI method is probably the tool that will preserve the quality of the project by regaining this time of retreat, reflection and an overview, too often set aside in face of daily emergencies .

Architectural description

Since 2008, the actors of the Pays de Fougères have been working around the same table, elected representatives, professional organizations, initial and continuing training organizations and research organizations to support the building sector. Ecobatys aims to develop actions aimed at the players in the territory dedicated to energy transition and the transition to a low-carbon and resource-based economy. The objective of the structure is therefore to demonstrate the performance of an eco-constructed building in an exemplary passive manner. To achieve this, it was necessary to redefine the design approach by using an innovative collaborative method to design the building and prepare its operation, involving all professionals, companies and future users. In order to optimize local resources and optimize the life cycle of the project, the second objective was the use of as many local and / or deconstructible materials (wood, straw, earth, granite ...) . It was also important to integrate the building as much as possible into its environment, preserving a biodiversity space, using the sun as the sole source of energy, and recovering rainwater for the environment, Autonomy of the toilet. In order for everyone to understand the building's mechanisms and its evolution over time, technical and construction systems (ventilation, electricity, insulation, etc.) are put forward in an educational way (visible networks, probes, explanatory panels, etc.).

See more details about this project



    Coglais Communauté Marches de Bretagne

    Community of communes of Pays de Fougères

    Construction Manager

    Ingénierie Associés

    Economist and Master of Execution


    Atelier Loyer Architectes

    Subject mastery

    Assistance to the Contracting Authority

    Wigwam Conseil

Energy consumption

  • 28,83 kWhep/
  • 77,00 kWhep/
  • RT 2012

    43% Lighting 26% Heating 14% Breakdown 11% Hot Water Sanitary 7% Information Technology

More information

Visualization of consumption and productions online with the Connectibat device. So far, annual consumption has always been lower than the annual production of solar panels.


    • Wood boiler
    • Wood boiler
    • No cooling system
    • Double flow heat exchanger
    • Solar photovoltaic
    • Wood boiler

Biodiversity approach

    Ecobatys is located in an industrial area in MAEN ROCH, 10km from Fougères. For the premises, there is a bus stop which serves the main surrounding villages. For vehicles, the pole is easily and quickly accessible by exit 30 of the A84 motorway linking Rennes (50km) to Caen (137km). Similarly, Ecobatys is located on the edge of Ille-et-Vilaine which makes it a strategic location at the crossroads of the regions of Brittany, Base-Normandy and Pays-de-la-Loire. A biodiversity space is built around the building. In hot weather it is not uncommon to see the workers of the surrounding companies settle down to eat.


    Polycrystalline Panels Voltec Solar VSPS

    Voltec Solar SAS

    1 rue des Prés, 67190 DINSHEIM-SUR-BRUCHE, FRANCE

    Table 'c21_italy.innov_category' doesn't exist SELECT one.innov_category AS current,two.innov_category AS parentFROM innov_category AS oneINNER JOIN innov_category AS two ON one.parent_id = two.idWHERE one.state=1AND = '3'

    The photovoltaic plant is 5 kWc is composed of 20 polycrystalline solar panels made in Alsace. The direct current of the two 360 volt panel chains arrives through the cables in the three-phase SMA inverter, which is located in the cabinet.
    It is transformed and then transported to the TGBT to be self-consumed. In case of surplus, it is resold. It is possible to retrieve data from the inverter on the building's internal network.

    French product and ecological, very well received in a passive construction approach.

    Pellematic Smart Boiler


    Agence ÖkoFEN Ouest - SARL Planète Claire La Tour d'ordre - 72150 LE GRAND LUCE - FRANCE

    Table 'c21_italy.innov_category' doesn't exist SELECT one.innov_category AS current,two.innov_category AS parentFROM innov_category AS oneINNER JOIN innov_category AS two ON one.parent_id = two.idWHERE one.state=1AND = '18'

    The Pellematic Smart is a multifunction wood pellet boiler. Its power is 8kW and the capacity of the buffer tank is 600L. The facility occupies 1.5 m² on the ground.

    It produces instantaneous hot water, integrates all the hydraulics at the boiler output to reduce costs and is coupled to the solar collectors of the roof. Solar energy covers almost 40% of the year's heat requirements, the rest being provided by the burning of wood pellets, which automatically takes place when sunlight is not sufficient. Thus, the consumption of pellets is less than 1 T / year.

    The boiler is also coupled to the double flow VMC.

    Produced in accordance with the approach of a passive construction. No problem to report.

Life Cycle Analysis

    Mode constructif en caissons bois/paille Bardages châtaignier et chêne Parement en granit local Cloisons isolées en Métisse (acoustique) Cloisons en terre

Building candidate in the category

Bas Carbone

Bas Carbone

Coup de Cœur des Internautes

Coup de Cœur des Internautes

Green Solutions Awards 2017 - Bâtiments

Author of the page

  • Valentin PICCO

    Chargé de mission Ecobatys

  • Other case studies



    Green Solutions Awards 2017 - Bâtiments