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Hélène Boucher co-ownership in Sevran

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This case study represents a rehabilitation and energy renovation of a 1970 condominium. It consists of a small joint ownership of 23 lots in Sevran (in Paris suburbs) as part of the "OPAH Quartier Rougemont" with the operator OZONE.


The works included the insulation of the roof terrace, the installation of a thermal insulation from the outside, the replacement of all the joinery, the installation of a humidity-sensitive ventilation, the insulation of the low floor and the setting up of the building's safety.


These renovations led to 68% of energy saving.


Owner approach of sustainability:


Insulation from the outside, Insulation of the roof terrace, replacement of all windows, and upgrading common areas. ECIC thermic. EVAM syndic. Budget 480 € 811 ht.


This allowed to divide by almost 3 the energy consumption of the condominium from 178 to 64 kWeh/m²/year. It has reached certain levels of BBC renovation requirement (without being labeled) thanks to this performance.


As a result, the occupants dropped the interior heating temperature by 3°C.


Energy consumption:

  • Primary energy need: 64,00 kWhpe/m2.year
  • Primary energy need for standard building: 178,00 kWhpe/m2.year
  • Calculation method: RT existant
  • Final Energy: 57,00 kWhfe/m2.year

Breakdown for energy consumption: 


22% heating

30% ECS

9% lighting

2% auxiliary pumps

5% auxiliary fans

  • Initial consumption: 178,00 kWhpe/m2.year

Envelope performance:


Envelope U-Value : 0,62 W.m-2K-1

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