Natural Building Systems has developed a carbon-negative modular system for sustainable construction. Using digital tools, they manufacture structural insulated panels (SIPs) with advanced bio-composites. The SIPs form an integrated ‘kit of parts’ analogous to flat pack furniture, delivered and rapidly assembled using non-specialist labour. Designed for disassembly and adaptation, their system reduces in-use carbon impacts by allowing zero waste alterations and re-use, and reduced operational carbon through improved energy efficiency, climate resilience and indoor air quality. The manufacturing process is energy-efficient and highly scalable.