Partial renovation of the Ark of Defense

  • Building Type : High office tower > 28m
  • Construction Year : 1989
  • Delivery year : 2017
  • Address 1 - street : 1 Parvis de La Défense 92800 PUTEAUX, France
  • Climate zone : [Cfc] Marine Cool Winter & summer- Mild with no dry season.

  • Net Floor Area : 60 354 m2
  • Construction/refurbishment cost : 192 000 000 €
  • Cost/m2 : 3181.23 €/m2

Certifications :

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

Redevelopment and modernization of the working spaces in the South wall. Renovations of the facades panoramic elevators. Modification of technical equipment and renovation of the premises in the infrastructures of the South Hills. Renovation of the roofs of the Ark and creation of a walkway bridge.

Sustainable development approach of the project owner

The environmental ambition is based on five axes: energy efficiency, durability of materials, long-term environmental performance, user comfort and sanitary quality of premises, so that the building is comfortable and pleasant to use. Live, easy to maintain, flexible, scalable and energy efficient.

Architectural description

Deep work on the façade for the winter heat + Insulated internal insulation + Improvement of Thermal resistance and waterproofness of the exterior joinery Increased access to daylight in traffic

Building users opinion

First feedback is positive



    Armanéo (EIFFAGE)

Contracting method

Other methods

Energy consumption

  • 80,00 kWhep/
  • 137,29 kWhep/
  • Heating: 11.832 kWhep / m² Cooling: 6.544 kWhep / m² DHW: 6.544 kWhep / m² Ventilation: 31.828 kWhep / m² Auxiliaries: 5.312 kWhep / m² Lighting: 21,384 kWhep / m²

  • 301,00 kWhep/

Real final energy consumption

    33,00 kWhef/

Envelope performance

  • 0,79 W.m-2.K-1
  • Sprockets insulated from the outside (R = 4.12 m².K / W)
    Opaque sections of North & South facades insulated from the interior (R = 3.15 m².K / W). North & South joinery Uw = 1,6 W / m².K
    Access to the inertia of floors in offices (no false floors)

  • 0,17
  • I4

  • 1,70


    • Urban network
    • Heat pump
    • Radiant ceiling
    • Tape
    • Individual electric boiler
    • Urban network
    • Water chiller
    • Reversible heat pump
    • Urban network
    • Tape
    • compensated Air Handling Unit
    • Double flow heat exchanger
    • Heat pump

Smart Building

    Class A GTB within the meaning of EN.15.232; Commissioning mission over 2 years of operation

Urban environment

  • 300,00
  • "La Grande Arche" is located in the business district of La Défense. It is an emblematic building, extremely well connected (public transport, shops, activities, services).


    Rainwater harvesting network


    [email protected]

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    The rainwater from the roof of the south wall of the Ark is recovered by two sheets of 20 m3 at the lower level to each feed a sanitary column of the offices of the South wall.
    The objective of this system is to reduce drinking water requirements by at least 16%.

Construction and exploitation costs

  • 192 000 000,00

Water management

  • 800,00 m3
  • 40m3 of storage recovering about 1000m². The sizing was dictated by the possible collecting surfaces and the storage volume available in the roof.

Indoor Air quality

    No measurement carried out. However, 95% of the materials in contact with indoor air have an A + label for indoor air emissions (formaldehyde at 28d <10μg / m3)

GHG emissions

  • 4,00 KgCO2/m2/an
  • RT2005

  • 50,00 année(s)

Life Cycle Analysis

    40000sqm of carpets labeled Gut. This guaranteed label of low emissions in indoor air, a lower consumption of resources throughout the life cycle of the product

Building candidate in the category

Energie & Climats Tempérés

Energie & Climats Tempérés

Coup de Cœur des Internautes

Coup de Cœur des Internautes

Green Solutions Awards 2017 - Bâtiments

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    Green Solutions Awards 2017 - Bâtiments