La Vénerie is a private co-ownership in the Paris Region, built in 1976. Six buildings together and a separate one form a block providing 147 housings, relying on collective heating and water. The aim was to diminish energy consumption by 42%, reaching BBC level (90 kWh / sqm.year) through a comprehensive program of external insulation, floor coverings, windows replacement, hygrometric mechanical ventilation, thermostatic valves, innovative ventilation sealing and lights refurbishment. The heating system had to be flood resistant, considering the building’s location.
The works have been estimated through BIM and an 3D scan, allowing for precise measurement of the existing state of the building. The program cost 3.2 million euros, and was covered partly through public support:
A collective regional aid of 300.000 €, around 100.000 € of white certificates; individual means dependent aid amounting to 360.000 € and 260.000 € tax credit. Total public support schemes hence reach more than a million euros on the project.
Hence, individual bricks of EPC shall be brought together, not through a single contract which is difficult to implement on the private co-ownership market, but through several contracts in a continuous operation. The results of an EPC are partly emulated through loans linked to the building and an MV incitation contract. The guarantee comes less from the exact consumption level than through the stock value of the building and a level of performance of the building that should result from the works design and implementation.
When EPC is unavailable for either trust or legal issues, the approximation of EPC can be reached through a nexus of contracts, if the key player is present through the whole process. This can be either the professional project manager or a facilitator overseeing the retrofitting, but involvement has to be substantial and durable. Trust issues can be mediated through independent facilitators at critical junctures (M&V calibration…).
The level and design of public support schemes is extremely important. The can nudge the co-ownership towards better energy efficiency that they would have considered, and be a precursor to M&V if they mandate post-works instrumentation. Thus, they should be targeted towards greater efficiency and laying precursor instruments to later virtuous behaviour.