Condominium of "Ru de Buzot" Schnapper

  • Building Type : Collective housing < 50m
  • Construction Year : 1963
  • Delivery year : 2018
  • Address 1 - street : 34 rue Schnapper 78100 SAINT-GERMAIN-EN-LAYE, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 9 138 m2
  • Construction/refurbishment cost : 2 360 000 €
  • Number of Dwelling : 110 Dwelling
  • Cost/m2 : 258.26 €/m2
  • Primary energy need
    86 kWhep/m2.an
    (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 Ru de Buzot residence is located in Saint-Germain-en-Laye. Composed of 3 buildings, not exceeding 4 levels on the ground floor, these small buildings are scattered among an island of greenery.

The Syndical Council chose the REANOVA company which was commissioned to carry out:

  • An energy audit in 2015 including proposals for different work scenarios;
  • A design mission with financial support;
  • The vote on the work at the General Assembly on November 8, 2016 for a period of 24 months; 2018: delivery of works

Following the completion of the audit, the condominium therefore embarked on a complete renovation program including:

  • the replacement of the original private joinery and rolling shutters;
  • installation of thermostatic valves;
  • insulation of lower floors;
  • insulation of roofs and repair of waterproofing;
  • the installation of a low pressure VMC;
  • the thermal insulation of facades from the outside;
  • the replacement of collective joinery (hall doors + fire door in the basement).

Photo credit




Construction Manager




    Lots of facades



    Carpentry and concealment lot



    Roofing lot



    Lot ventilation



    Heating package

Contracting method

Separate batches

Type of market

Global performance contract

Energy consumption

  • 86,00 kWhep/m2.an
  • RT 2012

  • 216,00 kWhep/m2.an

Envelope performance

  • 0,92 W.m-2.K-1
  • Initial medicine: 2.35


    • Gas boiler
    • Gas boiler
    • No cooling system
    • Natural ventilation


    Low pressure controlled mechanical ventilation

    HVAC, électricité / ventilation, cooling

    The low pressure box located on the roof or attic differs from the VMC by a lower operating pressure, between 15 and 30 Pa instead of 80 to 160 Pa for the VMC. This allows Low Pressure Ventilation to reuse existing natural ventilation ducts.

Construction and exploitation costs

  • 135 000
  • 2 370 000
  • 811 700
  • LOT 1: Treatment of facades: €1,235,570 including tax
    Rolling shutters for loggias and balconies: €157,600 including tax
    LOT 2: Replacement of the original private joinery (85% replacement) and insulation of roller shutter boxes, replacement of roller shutters with manual aluminum roller shutters: €470,900 including tax
    LOT 3: insulation of roofs and repair of waterproofing + creation of parapet + creation of smoke extraction: €239,140 including tax
    LOT 4: Breakdown: €166,894 including tax
    LOT 5:: Installation of thermostatic valves + installation of a
    variable flow pump in the boiler room + sludge removal + balancing
    hydraulic: €94,800 including tax

    Collective aids:
    EEC: €43,336
    MOE region grant: €74,000
    AMI sustainable co-ownership: €200,000
    CITE: €187,617
    ANAH: €306,800

GHG emissions

  • 20,00 KgCO2/m2/an
  • 57,00 KgCO2 /m2

Reasons for participating in the competition(s)

La résidence du Ru de Buzot est un exemple de rénovation globale exemplaire

En effet, suite à une étude technique approfondie, l'ensemble des copropriétaires ont pu voté un programme de travaux complet permettant de palier des déperditions thermiques importantes. Cette rénovation a permis d'atteindre un gain énergétique important et une valorisation architecturale, tout en respectant les délais et les budgets annoncés. 

Building candidate in the category

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Users’ Choice

Green Solutions Awards 2022-2023
 Renovation housing energy building Yvelines Copro Trophies ITE economy finance Copro renovation

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Marianne FERRY

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