We’re good at counting embodied carbon. But do we know which reductions are worth it?
Why embodied carbon tracking is no longer the bottleneck
For years, the construction industry treated embodied carbon measurement as the hard problem. Data was scarce, methodologies were inconsistent, and few teams knew how to calculate lifecycle emissions beyond operational energy. That phase is ending. The tools now exist, and many project teams have learned to use them. Consequently, the difficult question has shifted.
A new Trellis analysis argues that the real challenge is no longer whether you can measure embodied carbon, but how you decide which reductions are worth making. Specifically, the question is which interventions deliver the biggest carbon savings for the lowest cost. This matters because not all emissions cuts are equal, and treating them as if they are leads to inefficient allocation of budgets and effort.
The evidence supporting this shift comes from multiple studies across Europe and North America. Researchers and industry bodies have found that many embodied carbon reductions can be achieved at little or no extra cost. Furthermore, some measures actually reduce both emissions and construction budgets. The implication for UK businesses is straightforward: embodied carbon is becoming a design optimisation question, not a compliance burden.
What the international evidence shows
A major study by RMI and Skanska examined mid-rise commercial office buildings, multifamily housing, and tilt-up warehouse structures. The research found that embodied carbon could be cut by between 19 percent and 46 percent using what the authors called low-cost and no-cost measures. The added project cost was less than 1 percent overall. According to the report, this figure sits within the margin of error for most construction budgets.
European research has reached similar conclusions. Analysis linked to the EU Embodied Carbon project reviewed design case studies and found that, on average, a 41 percent reduction in embodied carbon could also cut costs by 9 percent compared with business as usual. Meanwhile, strategies focused on recycling and reuse were reported to lower embodied carbon by around 32 percent while reducing costs by 19 percent on average.
The EU work emphasised that the strongest results came when embodied carbon was considered at the design stage rather than retrofitted into a finalised plan. Early intervention allows structural choices, material substitutions, and specification changes that are difficult or expensive to make later. This finding aligns with longstanding construction economics: decisions made during concept and schematic design have the greatest cost leverage.
Canadian data adds further detail. A City of Vancouver study assessed different building archetypes and found that most embodied carbon measures produced construction cost savings rather than premiums. In some cases, estimated savings reached 25 percent of construction cost. One specific measure was reported to save up to 71 percent of global warming potential while reducing construction cost by more than 15 percent compared with the baseline design.
Additional research on reinforced concrete slabs found that two-way joist systems reduced embodied carbon by 25 percent to 35 percent and lowered construction costs by up to 15 percent when compared with alternative slab designs. These findings suggest that structural system choices, rather than exotic materials or niche technologies, often yield the best results.
Cost reductions happen through familiar design decisions
The mechanisms behind these savings are not revolutionary. They include selecting lower-carbon concrete mixes, specifying efficient structural systems, designing for material reuse, and avoiding overspecification. Each of these decisions can be made within standard design workflows. However, they require embodied carbon data to be available early enough to influence those choices.
For example, optimising a concrete mix to reduce cement content typically lowers both embodied carbon and material cost. Similarly, designing a structure that uses less material overall reduces emissions, procurement costs, and transport expenses. Reusing existing structural elements avoids both the carbon penalty of new production and the cost of demolition and replacement. These are not marginal gains; the studies cited show double-digit percentage improvements in both carbon and cost.
What has changed is that these decisions are now informed by embodied carbon data rather than cost alone. Previously, a project team might choose a structural system based on speed, cost, or buildability. Now, embodied carbon can be factored into that decision without requiring additional budget or schedule. The enabling condition is that lifecycle assessment tools have become easier to use and data on material emissions has improved.
The shift from measurement to prioritisation
This brings us back to the Trellis argument. Once you can measure embodied carbon reliably, the next question is how to allocate effort. Not every reduction opportunity is equally valuable. Some interventions cut significant emissions at low cost, while others reduce carbon only modestly but require substantial investment. Therefore, the emerging discipline is ranking interventions by cost-effectiveness rather than pursuing all reductions equally.
This approach mirrors the logic used in energy efficiency, where investments are ranked by cost per kilowatt-hour saved. Applying the same principle to embodied carbon means calculating cost per tonne of CO2 equivalent avoided. Measures with the lowest cost per tonne are prioritised, and those with high costs relative to carbon savings are deprioritised unless there are other strategic reasons to pursue them.
For UK businesses, this has practical implications. Companies bidding for construction contracts increasingly face carbon requirements in tender specifications. Understanding which design changes deliver the best carbon return for the least cost allows more competitive bids. Similarly, businesses operating buildings need to know whether embodied carbon reduction is a compliance cost or a potential saving. The evidence suggests it is often the latter.
Summary of key research findings
- RMI and Skanska reported embodied carbon savings of 19 percent to 46 percent with project cost increases of less than 1 percent across multiple building types.
- The EU Embodied Carbon project found that a 41 percent reduction in embodied carbon could reduce costs by 9 percent on average compared with conventional design.
- Recycling and reuse strategies were reported to cut embodied carbon by approximately 32 percent and reduce costs by 19 percent on average.
- A City of Vancouver study found that most embodied carbon measures produced construction cost savings, with some building archetypes showing up to 25 percent estimated savings.
- One measure in the Vancouver analysis was reported to save up to 71 percent of global warming potential while cutting construction cost by more than 15 percent.
- Research on reinforced concrete slabs found that two-way joist systems reduced embodied carbon by 25 percent to 35 percent and lowered construction cost by up to 15 percent compared with other slab designs.
What this means for procurement and compliance
UK businesses involved in construction, whether as clients, contractors, or suppliers, need to understand how embodied carbon is moving from a reporting metric to a design variable. Government procurement already includes carbon criteria through mechanisms like PPN 06/21, which requires suppliers to report carbon reduction plans. Embodied carbon will increasingly feature in those plans, particularly for capital projects.
The advantage for businesses that act early is that they can treat embodied carbon as a design opportunity rather than a compliance burden. If the evidence is correct, many carbon reductions are available at little or no cost premium, and some actually reduce project budgets. This means that businesses with the capability to model and optimise embodied carbon at the design stage can deliver better value in competitive tenders.
For manufacturers and material suppliers, the implication is that lower-carbon products are becoming a commercial differentiator. Specifiers are beginning to select materials based on lifecycle emissions as well as performance and cost. Products with lower embodied carbon and comparable cost are likely to gain market share, particularly in sectors where procurement decisions are influenced by carbon targets.
How to integrate embodied carbon into project decisions
The first step is to measure embodied carbon early in the design process. Waiting until detailed design is complete makes it difficult to influence the structural system, material choices, or procurement strategy. Early-stage lifecycle assessments, even if approximate, allow teams to identify high-impact opportunities when changes are still inexpensive to make.
Second, project teams should rank interventions by cost per tonne of carbon saved. This requires calculating the capital cost difference for each measure and dividing it by the carbon reduction achieved. Measures with negative cost per tonne, meaning they save both carbon and money, should be prioritised. Those with high cost per tonne should be reconsidered unless they address other project objectives.
Third, businesses should build capability in lifecycle assessment tools and data sources. Tools such as One Click LCA, ec3, and RICS whole life carbon assessment guidance are becoming standard in parts of the industry. Training staff to use these tools, or partnering with consultants who can, is increasingly necessary for competitive advantage. Our SBS Academy training on lifecycle carbon assessment provides practical support for businesses developing this capability.
Finally, businesses should engage with embodied carbon in procurement specifications. For clients, this means including carbon criteria in tender documents. For suppliers, it means preparing data on the embodied carbon of your products and being ready to demonstrate compliance. The businesses that treat this as a commercial opportunity rather than a compliance task are likely to benefit most.
Where to find further guidance
The UK government has published guidance on measuring and reporting embodied carbon through the Department for Energy Security and Net Zero. The government's net zero strategy sets out expectations for carbon reduction across the built environment, including embodied emissions. Additionally, the Royal Institution of Chartered Surveyors provides professional standards for whole life carbon assessment, which are widely used in UK construction projects.
The Institution of Environmental Management and Assessment offers resources on lifecycle assessment methodologies and industry best practice. For businesses needing support with carbon reporting and compliance, our compliance services cover embodied carbon alongside operational emissions and broader ESG requirements. Finally, the UK Green Building Council publishes sector-specific guidance on embodied carbon reduction, including frameworks for net zero buildings and infrastructure.