The main issue of the project is achieving a zero-carbon, zero-waste district while retaining 60% of the existing buildings and preserving historical significance.

Managing the systematic recovery, cataloging, and reusing building materials and components during demolition and reconstruction can be challenging.

The project retained 60% of the existing buildings to minimise demolition and reused salvaged materials (e.g., limestone slabs, brick panels, and other building components) both on- and off-site. Materials unsuitable for reuse were recycled into aggregates for new construction.

Tools like Urban Print software, life cycle assessments (LCAs), material passports, and carbon footprint analyses guided decision-making and ensured resource optimisation throughout the redevelopment process.

The design incorporates a 4,000 m² green public space, green façades, and roofs, fostering biodiversity. It leverages Paris’s non-potable water network and heat exchange systems to achieve 100% renewable energy use by 2050.

Housing options include 50% social, 30% open-access, and 20% intermediate housing. Participatory planning actively involves future residents and stakeholders in shaping the district’s design, fostering a sense of community ownership.

In addition, historic elements, such as English courtyards, were repurposed for modern functions like shops and business spaces.

The redevelopment, valued at €182 million, is set to become Paris’s first zero-carbon, zero-waste district, establishing a benchmark for sustainable urban planning and community involvement. Compared to traditional methods, circular construction strategies reduced greenhouse gas emissions by 30%. 60% of buildings are being conserved and renovated, reducing waste and virgin resource consumption.

Regarding the social impact, the project promotes social diversity with inclusive housing options and economic opportunities through businesses, services, and public facilities. Participatory planning fosters community engagement and shared responsibility for the neighbourhood's success.

Advanced tools like Urban Print and LCAs provided critical insights into resource and carbon impacts, setting a standard for lifecycle-oriented urban planning.

The project’s success offers a blueprint for other urban redevelopment initiatives, demonstrating how circularity and urban metabolism principles can guide sustainable transformation.