Rehabilitation and energy performance contract- "Les Balmes" Condominium

Last modified by the author on 04/12/2020 - 09:40
  • Building Type : Collective housing < 50m
  • Construction Year : 1966
  • Delivery year : 2018
  • Address 1 - street : 1856 grande rue 01700 MIRIBEL, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 3 975 m2
  • Construction/refurbishment cost : 973 793 €
  • Number of Dwelling : 50 Dwelling
  • Cost/m2 : 244.98 €/m2

Proposed by :

Certifications :

  • Primary energy need
    87 kWhep/
    (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

One of the first BBC co-ownership renovations, guaranteed by a global energy performance contract. Beyond the high energy ambition of this project, this co-ownership contracted an energy performance contract to ensure the reality of energy savings. Another particularity of this project: the work was carried out by a group of local SMEs, organized around the company CHANEL, joint agent of the group and led by the company OPERENE - thus allowing to combine an ambitious global energy renovation and the development of local building SMEs.

Sustainable development approach of the project owner

The condo has set the goal of BBC renovation performance level. The client wanted to entrust the realization of the work to a group of local SMEs, organized around a representative (company CHANEL) and led by the company OPERENE. The companies of the group have committed themselves on the basis of an 8-year performance contract. A process of accompaniment of co-owners was put in place upstream of the works, as well as information / awareness sessions.

Architectural description

It is a set of three buildings R + 3 to R + 4 totaling 50 lots, on a ground in front of road of a commune of the belt of Lyon. The thermal insulation from the outside of all the facades, as well as the loggias, allowed to bring a new architectural look, which was expressed through the choice of colors.

Building users opinion

Opinion of the president of the union council of the co-ownership:
"- very great satisfaction of the occupants for the thermal comfort: regular temperature between the day and the night
- air quality: removal of wet areas on the walls, reduction of kitchen odors
- outdoor lighting: significantly better (see too much) and lower consumption
- double glazing: the noise of the street does not get along almost.
- environment: the new appearance of the facades is very popular: light gray and orange colors, basement and garages in dark gray, new guardrails of the smoked glass balconies. "

The testimony of a co-owner dated June 6, 2019:
"I wanted to give you a feedback on the quality of the renovation work carried out in our condominium and thank you and all those who have participated from near or far. My entourage is unanimous, it is a real success aesthetic question as well as from a comfort point of view inside. I myself am happy to go home and I find the buildings very "class" seen from the main street. "

If you had to do it again?

Better anticipate the assembly of the loan files.

Photo credit

Aurélien Vivier Photographer Architecture Lyon


Construction Manager




    Low pressure ventilation Hygro B






    replacement joineries and shutters of 20 homes


    Chanel Rénovation

    2400 m2 of thermal insulation from the outside






    870 m2 low floor insulation



    990 m2 insulation roof terrace




    Other consultancy agency


    coordination of the group

Contracting method

Other methods

Energy consumption

  • 87,00 kWhep/
  • 96,00 kWhep/
  • RT existant

    Heating 50% ECS 38% Lighting 8% Ventilation and auxiliaries 4%

  • 207,00 kWhep/

Real final energy consumption

    81,00 kWhef/

Envelope performance

  • 0,77 W.m-2.K-1
  • n50

  • 1,80

More information

48% energy savings on the heating station compared to the initial state


    • Condensing gas boiler
    • Condensing gas boiler
    • No cooling system
    • Humidity sensitive Air Handling Unit (Hygro B
    • No renewable energy systems




    Management / Contracting

    The novelty of this project lies in the establishment of a global performance contract within a private condominium. The commitment is carried by a group of companies, with an agent of solidarity, the company CHANEL, and led by the company OPERENE. This group of companies responded to a consultation for a REM (construction-operation-maintenance) contract after the renovation project was drafted by a project management team.

    The management, the union council and the co-owners are reassured at the time of the start of the work because they can count on a commitment of results which concerns all the companies of the group. This contractual mode is indeed very reassuring: if the savings are not up to the expectations, a system of penalties is activated.



    Finishing work / Partitions, insulation

    Fibrous coating projected on the underside of raw concrete slabs for thermal insulation

    Product offered by the company that has put in place

    DHW storage tank with a capacity of 1000 liters - STG1000


    HVAC, électricité / heating, hot water

    The increase of the sanitary hot water storage capacity of the installation aims at a reduction of the boiler cycles-cycles, in order to reduce the energy consumption related to the production of domestic hot water and to increase the operating time of the equipment (generator, exchanger and peripheral equipment).

Construction and exploitation costs

  • 973 793
  • 236 360
  • Cost of all expenses included:
    973 793 € All tax included
    Collective aid:
    Region Aura: 172 210 €
    EEC: € 64,150
    Eco-PTZ collective
    Cost of works / housing aid deducted:
    € 14,749 TTC

Indoor Air quality

    The indoor air quality is ensured by the installation of a controlled humidity-controlled mechanical ventilation type B


    The performance contract put in place is based on a comfort temperature commitment in winter of 21 ° C during the day and reduced to 19 ° C at night. Temperature sensors were installed in a sample of dwellings.

    Not concerned

    Non concerné, pas de modifications sur les ouvertures

GHG emissions

  • 18,00 KgCO2/m2/an
  • not calculated

Reasons for participating in the competition(s)

  • rénovation globale et performante en copropriété
  • objectif d'atteinte du niveau BBC Rénovation
  • un engagement de résultat via un contrat de performance énergétique
  • Travaux et OPC réalisés par un groupement de PME locales (piloté par OPERENE avec l'entreprise CHANEL mandataire)
  • Une économie d'énergies de 48% sur le poste chauffage, garantie pendant 8 ans.

Building candidate in the category

Energy & Temperate Climates

Energy & Temperate Climates

Users' Choice

Users' Choice

Green Solutions Awards 2019 - Buildings

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chiara alice

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