The office dates from 1988 and is part of a complex, known as the Challenger buildings, which are undergoing renovation by Bouygues Construction. The aim is to make the 67,000 m² complex into a showcase of the firm's know-how. Primary energy consumption on the site will be a tenth of what it was for the original development while annual water consumption will be reduced by 60%.
Measures taken to meet the specific criteria for the three environmental assessments include: full life-cycle assessment of the building works, the installation of a phyto-purification system that enables grey water and rainwater to be purified through the action of plants, the specification of materials with low volatile organic compound and formaldehyde content, construction processes that limit dust and carrying out air quality tests on handover of the building.
The maintenance and operation of the site will be managed by Exprimm, a Bouygues Construction subsidiary, which became involved in the project at the design stage in order to optimise costs over the entire lifecycle of the buildings.
The Challenger renovation works began in 2010 and are scheduled for completion in the third quarter of 2014. A second building will be was handed over in August 2012 and when the renovation is complete, all the buildings on the site are expected to have triple certification.