Turning Buildings into Material Banks for a Circular Future
In the traditional life cycle of a building, demolition often marks an abrupt and wasteful end. Even in the case of meticulously planned implosions, the result is typically a mountain of debris destined for landfills. A growing movement within the construction sector is working to change that outcome, applying circular economy principles to reduce carbon emissions, conserve finite resources, and unlock new economic value.
Recycling and reuse have long been part of the conversation, but notable projects have demonstrated how far these strategies can go when applied at scale. A landmark example came with the Empire State Building’s energy-efficiency retrofit completed in 2010. The project involved replacing all 6,154 windows, yet rather than discarding the originals, contractors retrofitted them on site, reusing 97 percent of the materials. This approach not only contributed to a 38 percent reduction in the building’s energy use—yielding ongoing savings—but also avoided the cost of manufacturing new units, saving $15.5 million.
Despite such successes, the sector faces a daunting challenge. Buildings account for roughly 40 percent of global greenhouse gas emissions, and the United Nations Environmental Program warns that global floor space is on track to double by 2060. “Raw resource use is predicted to double by 2060 — with steel, concrete and cement already major contributors to greenhouse gas emissions,” the agency cautions. Incremental recycling efforts will not be enough to offset this growth.
Industry bodies are beginning to respond. In 2019, the World Green Building Council introduced its “Bringing embodied carbon up front” recommendations to improve transparency and accountability in material recycling. The World Economic Forum has also launched the “Circularity Lighthouse in the Built Environment” award, recognizing exemplary projects. The inaugural recipient, Swiss firm Holcim, earned the honor for its EcoCycle system, which “can recycle up to 100 percent of construction demolition materials across a broad range of applications, from decarbonized raw materials in low-carbon cement formulation, to recycled aggregates in circular concrete.” In 2022 alone, Holcim processed nearly 7 million tons of demolition materials through 100 EcoCycle facilities, with plans to add 50 more by 2030.
Beyond recycling, advocates are pushing for a fundamental shift in how buildings are conceived. The Ellen MacArthur Foundation promotes the idea of treating structures as “material banks,” designed from the outset for disassembly and reuse. “The materials that are used for construction have the potential to be very long lasting, evidenced by the countless historic buildings that make up our cultural landscape,” said Nick Jeffries of the Foundation’s insights and analysis team. Yet modern construction often favors irreversible assemblies, making recovery difficult.
Some projects are already testing the concept. In the Netherlands, a municipal building was constructed using high-quality prefabricated timber elements in a modular, “Lego-like” configuration. The design allows the structure to be dismantled after its intended 20-year use, with components ready for reuse. In Boston, a conference center integrated removable ramps and adaptable features into a parking garage, anticipating a future shift in transportation needs.
A key enabler for such strategies is the development of digital material passports—comprehensive datasets that track a product’s origin, composition, performance, and recyclability. While the European Union is moving toward digital product passports for textiles by 2030, construction presents a more complex challenge. In late 2023, London-based consultancy Waterman Group introduced what it describes as the “first standardized approach to materials passports” for buildings, aligned with the EU’s initiative. The system emphasizes design for disassembly, incorporates an online marketplace for reselling recovered materials, and aims to “facilitate informed decision-making on efficient material reuse while resolving the ambiguity around specification, performance and warranties of used materials.” A trial is already underway on a 12-story office project in London.
The economic case for scaling such circular practices is compelling. McKinsey & Co. estimates that “circularity in cement has the potential to create the highest value pool across materials, with an estimated net value gain of $10 billion in 2030 and $122 billion in 2050.” Both McKinsey and the Ellen MacArthur Foundation advocate for “lighthouse” projects to demonstrate the viability and benefits of these approaches, with the aim of catalyzing broader adoption across the industry.
