This paper presents a comprehensive case study of the Civil Engineering Office Community Liaison Centre, a pioneering project conceived as Hong Kong's first fully-realized circular building. It addresses a pressing research and practical question: How can an integrated framework of circular economy principles be systematically implemented in a dense urban public building to achieve radical reductions in embodied carbon, eliminate construction waste, and establish new benchmarks for sustainable construction? The project's methodology is grounded in a synergistic approach, uniting ambitious sustainability targets with multi-scale architectural and engineering strategies. This is operationalized through the interdisciplinary design approach and the specification of innovative, low-carbon materials, including laminated structural bamboo with nano-coatings, biochar-concrete precast panels sourced from local fallen urban trees, and CarbonCure concrete that mineralizes waste CO₂.
A foundational innovation is the rigorous application of Design for Manufacture and Assembly (DfMA) and Design for Disassembly (DfD) principles, utilizing modular, bolt-connected components and material passports to create a "building as a material bank" and ensure future reuse. Key findings demonstrate a validated reduction of over 50% in embodied carbon compared to conventional benchmarks, alongside the successful creation of multiple closed-loop material systems for both technical and biological nutrients.
The project's broader impact is its function as a living laboratory and a scalable prototype, providing a verified, data-driven blueprint for policy development, industry-wide best practices, and public education. It establishes a critical and replicable pathway for accelerating Hong Kong's transition to a circular built environment, directly supporting the city’s 2050 carbon neutrality target by demonstrating a viable, market-ready model for high-density cities globally.