• Building Type : Collective housing < 50m
  • Construction Year : 1972
  • Delivery year : 2020
  • Address 1 - street : 33 bvd Folke Bernadotte / 79 route de Sartrouville 78230 LE PECQ, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 6 262 m2
  • Construction/refurbishment cost : 1 471 000 €
  • Number of Dwelling : 91 Dwelling
  • Cost/m2 : 234.91 €/m2

Proposed by :

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

This project consists of implementing the thermal renovation of this 1970s residence, which has an 8-storey bar (building A) and two 6-storey plots (buildings B1 and B2).

This ambitious operation relating to buildings A and B1 includes the renovation of all the facades with thermal insulation from the outside, the replacement of the exterior joinery (private and smoke extraction skylights), the insulation of the roof terraces, the low floors on the car parks and roller shutter boxes, the installation of a VMC hygro B, the installation of thermostatic valves on the radiators, the cooling of the halls and their accessibility to PMR by external landscaped ramps.

The presence of asbestos in the exterior joinery joints and in the mosaic glue had an influence on the implementation of the ITE and on the replacement of certain windows.

GA vote on works: June 2018

Start of work: April 2019

See more details about this project


Photo credit

Doucet architects


    SdC Bernadotte

Construction Manager


    Thermal consultancy agency


    Other consultancy agency

    Energie Pulse

    Financial support



    Restoration, ITE



    Ventilation, heating




    Contractor representative

    IFF gestion

    joint property



    Exterior wood furnishings






    Asbestos removal

    Construction Manager

    Vincent Mollica

    SPS Coordinator

    Construction Manager

    Alpha Controle

    Technical controller


    Ace Paysage


Contracting method

Separate batches

Type of market

Global performance contract

Energy consumption

  • 133,00 kWhep/m2.an
  • 195,00 kWhep/m2.an
  • RT existant

    heating: 80.7 kWh/m² (61%), DHW: 30.3 kWh/m² (23%), lighting: 9.1 kWh/m² (7%), Aux. ventilation: 12.6 kWh/m² (9%)

  • 218,70 kWhep/m2.an

Real final energy consumption

    138,70 kWhef/m2.an

Envelope performance

  • 1,30 W.m-2.K-1

More information

Final energy consumption before works: 234.8 kWh/m².year (bat A) / energy gain 39% / label C Building B consumption: primary energy before works 328.5 kWh/m², after works 185 kWh/m² / distribution of consumption: heating 93.1 kWh/m² (50%), DHW 74.2 kWh/m² (40%), lighting 5.7 kWh/m² ( 3%), Aux. ventilation 11.3 kWh/m² (6%) / energy gain 44% / final energy before works 412 kWh/m².year, after works 228 kWh/m².year


    • Gas boiler
    • Water radiator
    • Gas boiler
    • No cooling system
    • Humidity sensitive Air Handling Unit (Hygro B
    • No renewable energy systems

Urban environment

    The condominium is located in the Canada district of Pecq, on the right bank of the Seine, at the northern limit of the town. The plot is served by two roads: Boulevard Folke Bernadotte and Route de Sartrouville. Building A is located along and parallel to the Seine on which it has a direct vis-à-vis.

Construction and exploitation costs

  • 78 463
  • 1 471 253
  • 357 041
  • HT aid:
    - ANAH engineering €5,460,
    - ANAH + Better Living bonus €340,737,
    - ANAH accessibility €10,844

    HV studies:
    - Architect (studies + site monitoring) €69,163,
    - Thermal BE (studies only) €3,900,
    - Financial engineer €5,400

    Other MOE (HT):
    - SPS €7,840,
    - BCT €6,000,
    - DO €19,273,
    - Trustee €13,370

    Asbestos DAAT (excl. VAT) €2,850

    HV works:
    - Restoration €499,050,
    - Exterior joinery €229,850,
    - Asbestos removal €26,950,
    - Sealing €134,860,
    - Electricity €8,555,
    - Breakdown €56,252,
    - Heating €30,899

GHG emissions

  • 30,00 KgCO2/m2/an
  • DPE

  • 50,00 KgCO2 /m2

Reasons for participating in the competition(s)

Cette opération a été exemplaire sur le niveau des performances visées (39 % de gain énergétique sur le bâtiment A et 44% sur le bâtiment B) et atteintes au pourcent près après comparaison entre prévisions et factures, avec une approche globale sur les parois opaques et vitrées, sur la ventilation et le chauffage et sur la mise en conformité des accès. Le défi a été de préserver et valoriser l'esthétique remarquable et le vocabulaire architectural des façades à un coût maitrisé.

Building candidate in the category

Users’ Choice

Users’ Choice

Green Solutions Awards 2022-2023
 renovation energy ventilation insulation ITE windows asbestos sealing accessibility Copros des Yvelines Trophies building housing energy

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Author of the page

Rémi Doucet


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