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 €
  • Cost/m2 : 258.26 €/m2
  • Primary energy need :
    86 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 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


    E. de Rugy - contact[at]




    Lots of facades



    Carpentry and concealment lot



    Roofing lot



    Lot ventilation



    Heating package

Contracting method

Separate batches

Energy consumption

  • 86,00 kWhep/
  • RT 2012

  • 216,00 kWhep/

Envelope performance

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


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

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)

The Ru de Buzot residence is an example of exemplary overall renovation .

Indeed, following an in-depth technical study, all of the co-owners were able to vote for a complete work program allowing significant heat loss to be overcome. This renovation has made it possible to achieve significant energy savings and architectural enhancement , while respecting the deadlines and budgets announced.

Trophées des Copros des Yvelines

 Yvelines Copro Trophies
 Copro renovation

Author of the page

  • Other case studies



    Trophées des Copros des Yvelines