New constructions in La Confluence are all high energy performance buildings. They have low energy consumption and mainly use renewable energy, a key mainstay in local sustainable development to limit energy consumption and greenhouse gas emissions.


Reducing greenhouse gas emissions and global warming is a challenge that Lyon Confluence has been addressing since its creation. To reduce energy consumption, buildings must meet several criteria:

  • high standard insulation and quality-controlled ventilation;
  • in housing design: openings on at least two facades, optimisation of natural light and at least two hours of sunlight per day;
  • choice of materials (wood, recycled concrete, earth etc.) to optimise energy performance and reduce the use of certain natural resources (sand, gravel).

The return of mudbrick
A new building made of earth in La Confluence? The idea of using this technique may seem surprising – and antiquated – but it has in fact been locally tried and tested. Mudbrick has been chosen for the construction of one of the buildings of the Ydeal sector, the Orangerie, a 1000 m² office building with five large arched openings rising up two floors.
Produced using local soil (sourced less than 30 km away), mudbrick is considered an environmentally friendly material thanks to its ability to regulate indoor temperature. It also absorbs ambient moisture due to the clay in its composition. Resistant, waste-free and boasting a small carbon footprint, this earthen material also guarantees good sound insulation. These construction qualities and the level of comfort it offers are valuable assets for occupants.

Ydéal, mudbrick in the spotlight


The buildings on Quai Perrache, facing the Rhône, will soon be home to offices. In the more distant future, they could be turned into residences with views of the river, after the transformation of the motorway into an urban boulevard.

How does it work? By designing “reversible" buildings, or buildings that can be easily converted into housing. And vice versa. Partitioning, access, utilities, etc, are all designed by the architects to be as flexible as possible. “Ydeal" and "Sollys" will be exemplary in this respect.

Sollys by Bouygues Immobilier

Helping users become consum’actors 
Improving the environmental performance of buildings is essential. Enabling users to adopt good habits to reduce energy consumption is just as important. This is why control tablets for home energy consumption are available in new builds and for the occupants of some of the eco-renovated housing. Part of this energy data is collected by a Community Energy Management System (CEMS) which analyses consumption across the quarter (as well as greater Lyon) to better adapt energy supply to demand.