81 Housing Units / Ramdam Architectes + Palast

Why It Matters

The project demonstrates how adaptive reuse and bio‑based construction can deliver high‑density housing with reduced environmental impact, setting a benchmark for sustainable urban regeneration.

Key Takeaways

• 81 units replace former army barracks in Nantes
• Wooden frame combined with prefabricated hemp‑crete façades
• Hemp‑crete panels produced off‑site, reducing on‑site waste
• Design prioritises daylight, double‑exposed flats, winter gardens
• Project merges heritage context with contemporary urban density

Pulse Analysis

Adaptive reuse of historic military sites is gaining traction as European cities grapple with housing shortages and climate goals. The former Caserne Mellinet in Nantes illustrates how developers can transform underutilised infrastructure into vibrant residential districts without erasing cultural memory. By inserting a new block of 81 units at the junction of six neighbourhood hamlets, the project reinforces connectivity, activates a pedestrian mall, and adds much‑needed density while respecting the existing urban fabric.

A standout feature of the development is its reliance on hemp‑crete, a bio‑based composite of hemp shives, lime and water. Prefabricated hemp panels were manufactured off‑site, allowing precise shaping of curved trumeaux and minimizing construction waste. Hemp‑crete offers superior hygrometric regulation, low embodied carbon, and fire‑resistant properties, aligning with the EU’s push for greener building materials. Coupled with a timber post‑beam floor system, the building achieves a light structural footprint and showcases the scalability of renewable construction technologies for mid‑rise housing.

From a design perspective, the architecture maximises natural light through double‑exposed units, expansive corner balconies and winter gardens, creating healthy living environments that command premium market interest. The façade rhythm, alternating large bays with rounded hemp‑crete elements, creates visual continuity with the historic barracks while introducing contemporary mineral aesthetics. This blend of heritage sensitivity, material innovation, and daylight‑centric design positions the project as a model for future urban regeneration initiatives seeking both sustainability and livability.