New Construction

  • Building Type : Office building < 28m
  • Construction Year : 2013
  • Delivery year : 2013
  • Address 1 - street : 9-11, rue du Débarcadère 92700 COLOMBES, France
  • Climate zone : [Cfc] Marine Cool Winter & summer- Mild with no dry season.

  • Net Floor Area : 30 684 m2
  • Construction/refurbishment cost : 75 000 000 €
  • Cost/m2 : 2444.27 €/m2

Proposed by :

Certifications :

  • Primary energy need :
    86.1 kWhep/m2.an
    (Calculation method : RT 2005 )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

West Plaza is an office building with a net floor area of ​​31,000 m2 which is designed according to the highest environmental standards as testified by its multiple certifications:

  • HQE (Out-standing 12 stars),
  • BREEAM (Excellent 74.1%),
  • BBC (Low consomption building certification french Label) ,
  • HQE Technical scheme building in operation-sustainable buildings (Excellent) and Sustainable Management (Out-standing),
  • The BREEAM In-use part1 certification is on going.

The installation of an "All Air" air-conditioning system in complement of high-performance equipment and materials makes West Plaza a very low consumption building.

A centralized Building Management System controls and reduces the overall cost of operation without loss of efficiency.

WEST PLAZA has a strategic location at the entrance of the largest European international business district and offers easy and quick connections by car (Boulevard Charles de Gaulle, A86) but also in terms of public transportation (the proximity to the T2 tramway and several bus lines positioned along the Charles de Gaulle boulevard that encourages the use of public transportation and the train station "La Garenne Colombes") and "gentle links" or alternative greenways (cycle paths, Autolib').

A study was conducted to encourage inoccupants to use gentle transportation modes such as cycling (2 wheels areaof 1 310m² planneded on 1st basement level direcly accessible for bicycles, on the north side of the building by a dedicated elevator from the Débarcadère street) or even the electric car (a parking area is reserved for electric vehicles with charging stations), for an improved carbon footprint.

Beyond the benefits of a very high quality construction, it also offers a rare set of high-level services: a restaurant, four club lounges, a cafeteria, an auditorium, a gym and concierge desk. West Plaza received the Grand Prix SIMI 2013 New Building category.

Sustainable development approach of the project owner

BRP3 wanted to propose an attractive building in the heart of a renewed area and with remarkable potential for development. This objective has imposed to focus the project on the relationship of the building with its immediate environment. The emphasis was put on accessibility and treatment of outdoor spaces.

The integration of the building in the Champs Philippe business area was a priority. Therefore, the realization of a low-nuisance site also became a priority. To make the building attractive, BRP3 wished ensure good management during the operation stage by facilitating maintenance. The management of energy, water and waste is naturally a parameter BRP3 wished to optimize so as to ensure an efficient and effective building.

The Contractor also emphasized the importance of ensuring a level of comfort and quality of interior spaces for future users of the building WEST PLAZA, including hygrothermal, acoustic and visual comforts as well as quality of spaces and water.

The specifications of the assistant of general contractor HRO for International standards match the latest requirements (for construction stage for High Environmental Quality (HQE, 2008 - Low consomption building certification). WEST PLAZA got the BBC label (French Low consomption building certification) with a reduction of energy consumption by 25% compared to the latest building carried by HRO, River Ouest (also HQE Construction / Operation certified). West Plaza also participated in the HQE Performance Test 2012 with the assistance of HQE association.

Architectural description

In the immediate area of influence of La Défense district, West Plaza unveils sleek and seamless architecture at the crossroads of major communication routes.
- 31 000m² of new offices for 8 levels with unobstructed views of La Defense.
- Designed for maximum flexibility, West Plaza is structured around two wings connected by a central block hosting the restaurant on the ground floor, the cafeteria and bar on the second floor as well as gateways located on the 6th and 8th floors
- Two separate and independent entrance halls
- Aerial and dynamic architecture signed by International d'Architecture
- Modern and elegant facades combining clear glass with a violet blue glazing, aluminum or coated.

The design of the West Plaza office spaces meets the user expectations in terms of flexibility and comfort. Optimized spaces, combined with the implementation of highly qualitative technical services, that offer a complete freedom for arrrangements and furnishing.

See more details about this project





    Assistance to the Contracting Authority

    HRO France

    Construction Manager

    International d'Architecture


    Construction company

    Campenon Bernard Construction (Groupe Vinci)

    General Contractor

    Assistance to the Contracting Authority


    Assistance environment general contractor

    Environmental consultancy

    Cabinet Alberto Pinto

    interior decorator

    Environmental consultancy

    Eric Ciborowski



    Lefort Francheteau (Groupe Vinci)



    Santernes (Groupe Vinci)



    SAGA (Groupe Vinci)


Contracting method

Lump-sum turnkey

Energy consumption

  • 86,10 kWhep/m2.an
  • 177,50 kWhep/m2.an
  • RT 2005

    Consumption on the floor area of the project:
    - Heating: 240062.6 kWh ep
    - Cooling: 71873.46 kWh ep
    - Hot Water: 159606.5 kWh ep
    - Ventilation Auxiliaries: 303837.9 kWh ep
    - Generation Auxiliaries: 42297.8 kWh ep
    - Distribution Auxiliaries heat/cold: 453.37 kWh ep
    - Llighting: 177705.7 kWh ep

Envelope performance

  • 0,88 W.m-2.K-1
  • Strips facade with extrenally insulated concrete aprons



    • Heat pump
    • Electric floor heating
    • Fan coil
    • VAV System
    • Individual electric boiler
    • Reversible heat pump
    • Fan coil
    • Floor cooling
    • Nocturnal ventilation
    • compensated Air Handling Unit
    • Double flow heat exchanger
    • Energy recovery from waste

Smart Building

    The BMS commissioned on the building is Johnson Controls, and operates under the BACNET LON protocols.

Biodiversity approach

  • 5 716,00 m2
  • 100,00 %
  • Within close proximity to the La Défense business district, West Plaza is at the heart of an economic development area. As a modern and attractive economic showcase for the 1st business district in Europe, it seduces reknowned international companies attracted by this new urban trend along the T2 tramway line:
    - A high concentration of installed companies
    - The 5th HRO international quality project developed in this new business area.
    - The renovation and improvement of the Champs Philippe neighborhood, of the Place de Belgique, Mission Marchand and Charles de Gaulle Boulevards.
    - Close proximity of La Défense, 1st European business district with 1.500 head offices including 15 of the 50 first international companies.


    Central Air Treatment


    4, avenue Laurent Cély 92600 Asnières sur Seine

    HVAC, électricité / ventilation, cooling

    Every open space into offices compartment is treated individually by his own central air handling unit with turbofan no recycling and 100% fresh air. These units take air from the outside through the front of technical rooms. The air is heated or cooled by the use of a transfer wheel. The air is discharged through a chimney to the roof to keep out air discharges from air intakes.
    Filters are placed upstream of the airducts supplied to an air filtration nine hygienic. All units are equipped with powerful filters. Technical specifications of the central air handling units : Classification: Their construction are self-supporting, without frame, to minimize thermal and acoustic bridges, guaranteeing excellent air tightness. They comply with the new European standards EN 1886, EN 13053, EN 13779 applying to air handling units.
    - Aluzinc sheet in 0.7 mm thick
    - Resistance of the envelope: D2 Class
    - Leakage of the envelope: L2 Class (leakage rate: 0.44l / sub s.m² a negative pressure of 400 pa) (leakage rate: 0.63l / s.m² under a positive pressure of 700 pa) -- - Leakage of the filter bypass: F9 Class
    - Thermal conductivity: T3 class
    - Thermal bridges: TB3 Class
    - Thickness of panels: 50mm rockwool
    - Density: 70kg / m³
    - Corrosivity class (environmental class): standard C4 / C5 version unpainted stainless steel complying with the standards BSK94 / 99, ISO 12944-2 and ISO 9223, the eQ units are recyclable.

    No product is ordered without prior acceptance of the client.

Water management

  • 2 091,00 m3
  • 153,00 m3
  • Rainwater recovery is planned for watering green spaces only. Two watering basins are provided respectively in the basements -2 and -3.
    Capacity : 32.52 m3 and 74.49 m3.

    Water is provided to the sprinkler system from the rainwater collecting tank; if low, the system automatically switches to main water grid.
    Lack of space on the project does not allow to recycle treated wastewater on site. The re-use of treated water is more suitable for high water use (eg for bathing water). In addition, the ground surface does not allow to integrate a waste water recycling system.

Indoor Air quality

    An audit of the air quality was done with sampling points chosen to reflect the different sources of influence on parameters including the quality of the indoor air, CTA and the influence of materials and products used in the building. The following results of VOCs and formaldehyde are below the standard recommended values: - Inter entreprise restaurant, dining room: 64.56μg / m³ VOC including 3.45 g / m³ Formaldehydes
    - Auditorium: 89,56μg / m³ VOC including 4.90 g / m³ Formaldehydes
    - Salon 1: 55,39 g / m³ VOC including 1.73 g / m³ Formaldehydes

    Office spaces are treated only with renewed air, thus ensuring hygienic air flows way above the regulatory hygienic air flows. The building has a mechanical ventilation in all rooms.
    - Flow of fresh air toilet on office space = 250 111 m3 / h
    - Maximum occupancy is 2,214 occupants.
    - Flow of fresh air per occupant = hygienic minimum of 25m³ / h / occupier and up to 113 m³ / h / occupant
    The CO2 sensors are installed in the lounges club and the auditorium (areas relevant for slaved airflows ).


    One of the main concerns of the contractor is to promote the comfort and well being of users. For West Plaza, the contractor rethought the way office building is heated and cooled. The air conditioning system is an "All Air" type, meaning there is no air recycling in spaces and provides only 100% new air, thus ensuring hygienic air flows well above the regulatory hygienic air flows (optimized according to occupation). Each rental has its own central air handling unit. Through a reasoned ventilation, and a long thought positioning of heating and cooling emitters, the sensation of cold or warm air currents is suppressed. CO2 sensors are installed in the meeting rooms and the auditorium (relevant areas for slaved air flows).
    The temperatures are maintained based on occupancy hours and presence detection. Users can also vary according to a comfort temperature range with remote controls. The mechanical ventilation vents are auto-adjustable.
    An acoustic ambience quality is adapted to different spaces:
    - Optimizing the level of sound insulation between the plates,
    - Installation of high acoustic performance facades (against outside noises),
    - Selection of equipments based also on low acoustic nuisance.
    The building offers access to daylight and views through large window bays. All office spaces are located along the sides of the building and therefore have access to natural light and views. Cafeteria, Inter Enterprise restaurant, gym, kitchen and VIP rooms on the ground floor overlook the façades and thus also have access to natural light. All windows of office space are provided with sunscreens (inner fabric blinds over the entire periphery of the building). Wooden Venetian blinds are installed in VIP lounges, the restaurant and the gym, and aluminum blinds in the kitchen and cafeteria. The office floors have an optimal artificial lighting comfort providing superior illumination uniformity 0.6. The lighting level of 300 lux on the working plan for every office space. The selected office lights come from DEBBAS with very low luminance and 94% efficiency (2x14W) and used to validate a color temperature of 4000 K and a color rendering index (CRI) of 85. The UGR values (Unified Glaring Ratio) of less than 19 to ensure comfortable conditions for glare.
    Remote controls are installed in the office floors and configured on the GTB. Presence sensors help provide sufficient lighting according to the kind of occupation.
    Spaces that could emit odors are located in specifically positioned areas of the building (toilets, Inter Enterprise Restaurant, Waste) and have an efficient air treatment (pressure reduction) and an optimal air circulation.
    Specific hygiene conditions are created to facilitate the maintenance of ponds by the choice of materials (wall tiles is quite high). The floors are provided with two local maintenance rooms per office space, sized for storing products.
    Prevention of pollution risks and preservation of water quality to ensure water at 55 ° C in all parts of the loop network. The temperature of the loop system is monitored by the BMS, which will alert when temperatures go below 53 ° C. The cold water pipes are insulated with a vapor barrier to prevent condensation. Sampling taps are implemented near the users outlets to control the efficiency of the water treatment.

    RIE, salle de restaurant : 482 ppm ; Auditorium : 455ppm ; Salon N°1 : 562 ppm

    Acoustic measurements were performed on site to determine the minimum requirements in terms Sleeving facade and analyze more precisely what are the main sources of external noise to the site: the railway lines to 10 m (cat.1), traffic Road to the Charles de Gaulle Boulevard (cat.3) 100 m, traffic on the street Landing, air traffic, production or ventilation equipment businesses surrounding the site of the project. The results of acoustic measurements are:
    - Facade Insulation
    Acoustic insulation goals for office spaces on facades concerning the outside :
    - Façade Nord :35 DnTA,tr ;
    - Façade Est : 39 DnTA,tr ,
    - Façade Sud : 42 DnTA,tr ,
    - Façade Ouest : 39 DnTA,tr
    Measured facade insulation performances in DnTA,tr (dB):
    - Office space on 2nd floor Northern Facade: 38 DnTA,tr ;
    - Office space on 2nd floor Northern Facade : 44 DnTA,tr ;
    - Office space on 2nd floor Eastern Facade: 41 DnTA,tr ;
    - Office space on 2nd floor Southern Facade: 42 DnTA,tr ;
    - Office space on 3rd floor Southern Facade: 43 DnTA,tr ;
    - Office space on 3rd floor Southern Facade: 45 DnTA,tr

    Insulation for aerial noises:
    Measured performances (DnTA (dB))
    - Emission : 4th floor Office space Building #1 – Reception : 3rd floor office space Building #1: 49
    - Emission : 3rd floor Bathrooms Building #1 – Reception: 3rd floor office space Building #1: 49
    - Emission : 4th floor Office space Building #2 - Reception : 3rd floor office space Building #2: 50
    - Emission : 3rd floor Bathrooms Building #2 – Reception : 3rd floor office space Building #2: 46
    - Emission : 10th floor Terrace Building #1 – Reception : 9th floor office space Building #1: 60
    - Emission : 10th floor Terrace Building #1 – Reception : 9th floor office space Building #1: 53
    - Emission : 1st floor VIP Room - Reception : 2nd floor Office space Building #2 : 55
    - Emission : 1st floor Auditorium - Reception : 2nd floor Office space Building #2: 53
    - Emission : 1st floor Gym – Reception : 2nd floor Office space Building #2: 60
    - Emission : 1st floor Restaurant - Reception : 2nd floor Office space Building #2: 55
    - Emission : 1st floor Delivery area Building #1 - Reception: 2nd floor Office space Building #1: 53

    Sound reverberation duration and Equivalent Absorption Area
    Measured reverberation durations in 3rd floor Office space Building #2 :
    Durations per octave bands (Hz):
    3rd floor Building #1 bât1: 125: 0.8 / 250: 0.9 / 500: 0.6 / 1000: 0.8 / 2000: 1.4 / 4000: 1.4
    R+2 bât2: 125: 0.8 / 250: 0.7 / 500: 0.6 / 1000: 0.8 / 2000: 1.3 / 4000: 1.3
    Average sound reverberation duration Tr (500, 1000, et 2000 Hz): R+2 bât1: 0.9 -R+2 bât2: 0.9

    Insulation against impact sounds
    Measured performances L’nT,w (dB):
    Emission : 4th floor office Space Building #1 - Reception : 3rd floor Office Spaces Building #1: 39
    Emission : 3rd Floor Bathrooms Building #1 – Reception : 3rd floor Office spaces Building #1: 56
    Emission : 4th floor office Space Building #1 - Reception : 3rd floor Office Spaces Building #2: 41
    Emission : 3rd Floor Bathrooms Building #1 - Reception : 3rd floor Office Spaces Building #2: 33
    Emission : 1st floor VIP Room – Reception : 2nd floor Office space Building #2: 33
    Emission : 1st floor Auditorium - Reception : 2nd floor Office space Building #2: 38
    Emission : 1st floor Gym – Reception : 2nd floor Office space Building #2: 32
    Emission : 1st floor Restaurant - Reception : 2nd floor Office space Building #2: 30
    Emission : Cafeteria – Reception : 2nd floor Office space Building #1: 41

    Noise level of equipments in spaces to be arranged
    Normalized levels with reverberation durations measured in office spaces:
    1 GE on 10th floor terrace to 9th floor office spaces Building #1: 31.7
    2 GE on 10th floor terrace to 9th floor office spaces Building #1: 32.32
    Heat pump on 10th floor terrace to 9th floor office spaces Building #1: 31.1
    Central air handling unit on 8th floor Compartment D – Measure 1 to 8th floor Office space Building #2: 36.1
    Central air handling unit on 8th floor Compartment D – Measure 2 to 8th floor Office space Building #2: 35.4
    Central air handling unit on 8th floor Compartment D – Measure 3 to 8th floor Office space Building #2: 33.0
    Central air handling unit on 8th floor Compartment D – Measure 4 to 8th floor Office space Building #2: 30.7
    Central air handling unit on 8th floor Compartment D – Measure 5 to 8th floor Office space Building #2: 33.2

GHG emissions

  • 22,96 KgCO2 /m2
  • 50,00 année(s)
  • 1 148,00 KgCO2 /m2
  • The test was done during the HQE Performance Test in 2012 and led by the HQE association. We used the ELODIE software to get all the necessary data.

Life Cycle Analysis

Reasons for participating in the competition(s)

Climatisation et traitement d’air

Les dispositions architecturales, le choix des matériaux, ainsi que les équipements techniques ont été pensé sur le projet afin d’apporter le maximum de confort aux utilisateurs, tout en privilégiant leur santé.

  • Les bureaux sont climatisés par un système ‘Tout Air’ à débit variable sans recyclage et 100% air neuf, garantissant des débits d’air hygiéniques bien supérieurs aux débits d’air hygiéniques règlementaires et sont optimisés en fonction de l’occupation.
  • Les ambiances sont contrôlées par une télécommande ‘radiofréquence et multifonctions’ (capteur de température intégré) et par la GTB.
  • Les terminaux CVC démarrent et s’arrêtent en fonction de l’occupation avec algorithme d’anticipation en cas d’écart de température ambiante important.
  • Le système « Tout Air » permet de profiter du « Free-Cooling » tout en produisant un débit d’air hygiénique important et assurant ainsi une sur-ventilation des espaces.
  • Les diffuseurs terminaux sont de type « Dynamique », ils possèdent une assiette qui corrige le jet d’air en fonction de la température de l’air primaire, limitant ainsi les courants d’air froid sur les utilisateurs.
  • Les bouches d’extraction des sanitaires sont auto réglables et certifiés.
  • Des sondes CO2 sont installées dans les salons-club et dans l’auditorium (espaces pertinents pour asservir les débits d’air). L’ajout de sonde CO² complémentaires en fonction de l’aménagement du locataire est possible.

Les besoins en eau glacée et eau chaude de l’immeuble sont assurés par des pompes à chaleur de dernière génération, et le dimensionnement de l'installation et distribution de calories/frigories tient compte :

  • Des apports solaires
  • Des apports sensible et latent (1 personne pour 10 m ² utiles net de bureaux, soit hors circulations et sanitaires)
  • Des apports des équipements (éclairage et puissance): 19W/m² de surface utile nette de bureaux, et hors sanitaires)
  • Les équipements sont surdimensionnés de 10% (batteries de CTA, ventilateurs) moteur set variateurs de 15%, pompes de 5%,unités terminales de 5% et pompes à chaleur de 10%.

Chaque compartiment de bureau possède sa propre centrale de traitement d’air.

Cet air est filtré et chauffé ou refroidi selon les conditions d’ambiance des bureaux. Cette centrale d’air est localisée dans un local technique se trouvant dans le compartiment de bureaux. Le réchauffage et le refroidissementde l’air est assuré par des pompes à chaleurs 4 tubes installées en terrasse et produisant simultanément de l’eau chaude et de l’eau glacée. Ces centrales d’air sont équipées d’une roue de récupération d’énergie sur l’air rejeté.

Chaque locataire peut piloter en toute indépendance ces équipements et contrôler ses consommations, grâce à l’accès individualisé à des vues graphiques sur la GTB.
Chaque local technique CVC possède son propre écran de supervision.

Eclairage naturel/artificiel

Les utilisateurs ont accès à la lumière du jour et accès aux vues grâce à une surface importante de baies vitrées en premier jour et un éclairage naturel de haute qualité en second jour. Une étude d'éclairement naturel a permis de valider l'atteinte du FLJ> 1,5% pour 80% de la surface de la zone de premier rang, dans plus de 80% des bureaux (application du -0,5% car un travail sur écran est prévu).

L’éclairage des bureaux dans les zones de travail centrales et périmétriques est asservi à la GTB et à l’occupation des espaces. De plus, les luminaires des zones en périmétrie sont équipés d’une cellule pour moduler l’éclairage artificiel en fonction de l’éclairage naturel.

Les luminaires des zones de travail sont allumés par détecteur de présence, cellules photoélectriques et peuvent être allumés ou éteint aussi par des télécommandes à tout moment. L’éclairage est gradable et représente une puissance de 5 W/m². Le coefficient d'uniformité dans les bureaux est supérieur à 0,6.

Les luminaires et les grilles de diffusion ont été choisis, entre autres, en fonction du critère d'éblouissement :

- Les luminaires bureaux sélectionnés sont des tubes fluorescents T5 de marque DEBBAS optique très basse luminance et rendement élevé à 94% (2X14W).

- Les valeurs UGR (Unified Glaring Ratio) sont inférieures à 19 pour garantir des conditions de confort relatives à l'éblouissement.

Les locaux émettant des odeurs sont situés dans des zones bien localisées du bâtiment (sanitaires, RIE, locaux déchets) et bénéficient d’un traitement d’air efficace (mise en dépression) et un brassage d’air optimal.
Les conditions d’hygiène spécifiques ont été créées afin de faciliter l’entretien des pièces d’eau par le choix des matériaux. Une attention particulière est apportée à l’hygiène, comme un carrelage toute hauteur, des robinets infrarouges,… Présence d’un local d’entretien par ½ plateau de bureau correctement dimensionné pour permettre le stockage des produits de nettoyage.

Une réflexion a été menée sur les risques de pollution et le maintien de la qualité de l’eau par :

  • Surveillance et ajustement de la température du réseau cuisine.
  • Afin de garantir une eau à 55°C en tous points du réseau bouclé. La température du réseau bouclé est surveillée par la GTB qui donnera l’alerte lorsque les températures passent sous 53°C.
  • Le stockage de l’ECS du restaurant possède une fonction anti-légionellose automatique, avec choc thermique et déconcentration automatique sur programme hebdomadaire.
  • Les robinets des sanitaires sont de type à détection infra-rouge pour une meilleure hygiène avec une fonction anti-légionellose en assurant un rinçage minimale tous les 24h évitant ainsi les eaux stagnantes.

  • Maîtrise des performances des traitements : Mise en place de robinets de prélèvements en extrémités des réseaux à proximité des points de puisage.

    Author of the page

  • Other case studies