Le Koala is a colourful office building in Savoie, France, where priority was given to a high level of comfort at work. A healthy lifestyle and minimal use of resources are two criteria specified in the standard for passive housing. The X-TEND stainless steel mesh employed has a mesh size of 100 millimetres. It safeguards the walk- in access to the offices and makes a valuable contribution towards meeting the building’s certification requirements.