Our project for the students challenge IMPACT 2019. We chosed to renovate old mills all along the river Hérault in the french region next to Montpellier. The goal is renovate old buildings with biosourced materials, and trying to find a good way to build respecting the environment and nature in general. For that we want to reuse the stones issue from old typical cabins located on the fields in this region. We try to use also wood from the region and insulating materials made by local firms with local plants like miscanthus for example.