Embodied Carbon in Construction: Why Circular Buildings and Design for Disassembly Matter

Embodied carbon is rapidly becoming one of the biggest climate challenges in construction. In this article we explore how circular building design and design for disassembly can reduce emissions from the outset, turning buildings into future material assets rather than demolition waste.

The construction sector is responsible for a significant proportion of global greenhouse gas emissions. While operational energy efficiency has long been the focus of sustainability strategies, the industry is now paying closer attention to embodied carbon in construction, the emissions associated with materials, manufacturing and building processes.

For many new developments, embodied carbon can account for 40–60% of a building’s total lifecycle emissions before it is even occupied. These emissions are effectively locked in once construction begins. Once materials such as concrete and steel are used, that carbon impact cannot easily be reversed.

This is why an increasing number of organisations are exploring how to avoid carbon emissions at the earliest stages of design, rather than attempting to reduce or offset them later.

Designing out embodied carbon

The most effective opportunities to reduce carbon occur during the early design stages of a project. Decisions around structural systems, material selection and building layout can significantly influence a building’s lifetime emissions.

By prioritising lower-carbon structural systems, limiting the use of high-carbon materials where possible and incorporating whole life carbon assessment early in the design process, it is possible to substantially reduce embodied emissions.

Recent examples in the commercial property sector have demonstrated that upfront embodied carbon levels of around 400 kgCO₂e per m² (A1–A5) are achievable. This aligns with ambitious industry benchmarks such as the RIBA 2030 Climate Challenge.

The use of responsibly sourced timber and other bio-based materials can also contribute to biogenic carbon storage, meaning atmospheric carbon absorbed during tree growth remains stored within the building structure.

Circular buildings and design for disassembly

Reducing embodied carbon is only part of the solution. Increasingly, the industry is exploring how buildings can be designed according to circular economy principles.

Traditionally, buildings are constructed in ways that make future disassembly extremely difficult. When redevelopment occurs, structures are often demolished and large quantities of materials are sent to landfill or downcycled.

Circular construction takes a different approach.

Through design for disassembly, buildings are created so that structural elements and materials can be taken apart and reused in future projects. Mechanical connections, adaptable layouts and recoverable materials allow buildings to function as material banks for the future rather than sources of waste.

The potential benefits include:

  • Reduced demolition waste
  • Lower future redevelopment costs
  • Greater building adaptability
  • Reduced embodied carbon across multiple lifecycles

Why circular construction is gaining attention

Across the UK, regulators, investors and planning authorities are increasingly focusing on whole life carbon in buildings. Several cities now require whole-life carbon assessments as part of planning submissions, and industry benchmarks continue to tighten.

For developers and asset owners, embodied carbon is becoming more than a sustainability metric. It is increasingly linked to long-term asset resilience and regulatory risk.

Buildings with high embodied carbon and limited adaptability may face greater challenges as climate policy evolves. In contrast, buildings designed with circular principles may prove more adaptable, lower risk and better aligned with future sustainability expectations.

Building for the future

Reducing carbon emissions in the built environment will require more than incremental improvements. It requires a shift in mindset, from constructing permanent structures to designing adaptable systems of materials that retain value over time.

By addressing embodied carbon from the outset and integrating circular design principles into new developments, the construction sector has an opportunity to avoid emissions before they occur.

For organisations planning new developments or refurbishments, understanding embodied carbon and circular construction is becoming an essential part of building responsibly for a low-carbon future.

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