Mathilde Billet


January - March 2023

Mathilde Billet
  • Architecture
  • Cities
  • Portland
“In addition to addressing the problem of depleting resources, reuse is a sensible approach for limited, seemingly finite urban spaces that presents very appealing solutions in short-circuit urban logistics.”

Since graduating from the École d’architecture de Paris Val-de-Seine in 2009 and training as a project manager at the École nationale supérieure d’architecture de Paris-La Villette in 2010, I have had the chance to explore the many facets of the architectural profession at various agencies, including Beckmann N’Thépée for the 2008 Venice Biennale and Atelier 234, as a volunteer for Shelter Associates, and as an independent architect.


After six years following a “conventional” approach to architecture in which I saw no future for myself, I became acquainted with the Encore Heureux agency, and worked with them on a variety of projects, including the Circular Pavilion for COP21. It was then that I saw the clear potential of reusing building materials in architecture.


In 2016, I joined the team at Bellastock following the second round of a call for proposals regarding waste reduction in the construction industry, which was launched by the French Environment and Energy Management Agency (ADEME) and entitled REPAR #2 – Reuse as a Bridge between Architecture and Industry (2014–18). Bellastock won this call for proposals alongside its partner, the Scientific and Technical Center for Building (CSTB). I soon became keen to conduct empirical research, and to set up new practices in the construction sector that would incorporate the human and material resources of different jurisdictions.


In 2019, Bellastock gained the status of cooperative, and I took on my current role there as co-director and technical director for reuse of materials and jurisdictional circularity.


After getting her degree in architecture in 2019 and spending the next six years working for various agencies, Mathilde Billet joined Bellastock in 2016, broadening her scope of study and projects around contemporary challenges for the circular economy applied to the reuse of building materials, while helping promote such practices among a wide spectrum of individuals and organizations (students, professionals, institutions, inhabitants, etc.). In 2020, Bellastock was awarded the Jeunes Urbanisme Prize and named in Trait magazine’s “Top 100 Influential Urban Planners” (“100 qui font la ville”). 


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Odéys is a sustainable construction network in Nouvelle-Aquitaine. By connecting construction professionals, we lead them through durability challenges, promote innovation as well as support ambitious projects.


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