Feldballe School Extension by Henning Larsen: A Carbon-Negative Model for Sustainable School Architecture

Architects: Henning Larsen 

Located in Feldballe, the Feldballe School extension represents a groundbreaking step in sustainable school architecture, designed for future generations facing the realities of the climate crisis. This innovative 250 m² educational space demonstrates how carbon-negative construction, bio-based materials, and circular design strategies can reshape the future of learning environments.

Climate-Responsive Architecture for the Next Generation

Designed as a science-focused learning facility, this project by Henning Larsen pushes the boundaries of eco-friendly architecture. The concept goes beyond reducing emissions, it actively sequesters carbon, making it a benchmark in low-carbon and regenerative building design.

The extension reflects a forward-thinking approach where architecture becomes a teaching tool, encouraging students to engage with sustainability through the very space they inhabit.

Bio-Based Materials: Straw, Timber, and Natural Innovation

At the core of the project is a radical material strategy that replaces traditional construction materials like concrete and steel with renewable, non-toxic, and locally sourced alternatives.

The structure utilizes:

• Compressed straw panel systems for carbon sequestration
• Locally sourced timber roofing for reduced embodied energy
• Clay plaster walls to enhance breathability and indoor comfort
• Natural eelgrass-based ventilation filters for improved air quality

These materials not only reduce environmental impact but also create a warm, tactile, and healthy indoor learning environment, essential for modern educational architecture.

Circular Construction and Scalable Design Solutions

One of the most innovative aspects of the Feldballe School extension is its design for disassembly. Every component is carefully planned to be reused, recycled, or reassembled, aligning with circular economy principles in architecture.

This scalable system, developed in collaboration with EcoCocon, demonstrates how modular bio-based construction can be adapted to various building typologies globally.

Energy Efficiency and Passive Environmental Strategies

The building integrates passive design strategies to minimize operational energy consumption. Natural ventilation, supported by the breathable properties of straw and clay, ensures a consistent indoor climate without mechanical systems.

Additional sustainability features include:

• Solar panels for renewable energy generation
• High ceilings and open interiors for improved airflow
• Smart air-quality monitoring systems

These elements collectively enhance energy-efficient school design, reducing reliance on artificial systems.

Carbon-Negative Performance and Lifecycle Impact

The project sets a new standard in life cycle assessment in architecture, achieving an impressively low carbon footprint of 6 kg CO₂e/m² annually over 50 years. With prolonged use, this can reach carbon-negative levels, making it one of the most environmentally responsible educational buildings today.

This achievement highlights the importance of long-term sustainability strategies, where building longevity directly contributes to environmental performance.

Educational Architecture as a Catalyst for Change

Part of the eco-community Friland, the school extension embodies a larger vision, educating students to become environmentally conscious leaders. The building itself acts as a living laboratory, demonstrating principles of green building design, material innovation, and climate-responsive architecture.

 A Blueprint for Future Sustainable Schools

The Feldballe School extension is a powerful example of how sustainable architecture, bio-based construction, and circular design thinking can converge to create meaningful, future-ready educational spaces.

By combining innovation with environmental responsibility, Henning Larsen has delivered a project that not only reduces impact but actively contributes to a regenerative future.

All photographs are works of  Rasmus Hjortshøj - COAST