The construction and infrastructure sector has no shortage of climate targets.
Governments, developers, local authorities, asset owners and contractors have published net-zero commitments, embodied-carbon targets, social-value frameworks and sustainable procurement policies. But targets do not reduce carbon on their own.
Carbon is reduced when a project team makes different decisions about design, materials, logistics, construction methods, asset operation and procurement.
That is why the latest focus on carbon in procurement matters. It moves the conversation from aspiration to delivery.
A recent spotlight by New Civil Engineer and the Institution of Civil Engineers asks a practical question: how do we actually procure low-carbon infrastructure?
The answer is not simply to add a carbon question to a tender form.
Low-carbon procurement requires carbon to be designed into the project from the beginning: the business case, scope, specification, evaluation criteria, contract terms, measurement process and final performance review.
Why procurement is the decisive point
By the time a contractor is appointed, many of the most important carbon decisions may already have been made.
A client may have fixed the location, scope, programme, design standard, material assumptions and risk allocation. A consultant may have selected a design that requires large quantities of concrete, steel or imported materials. A tight programme may have limited the ability to optimise logistics or use lower-carbon alternatives.
If carbon enters the process only at the tender stage, suppliers may be asked to find savings within a constrained design. They may be able to improve some details, but they cannot easily change the decisions that created most of the project’s footprint.
The procurement process must therefore begin earlier.
A carbon-aware project asks:
Is this asset needed, or can the same outcome be achieved through refurbishment, reuse or demand management?
Can the design use less material?
Can existing structures or components be retained?
Can low-carbon materials be sourced locally and at scale?
What is the whole-life carbon impact of different options?
How will construction methods, transport and temporary works affect emissions?
Can contracts reward suppliers for verified carbon reductions rather than simply lowest upfront cost?
These are commercial and engineering questions. Procurement is where they become enforceable.
The whole-life carbon principle
Operational energy has historically received most attention in building and infrastructure sustainability. But whole-life carbon is becoming equally important.
Whole-life carbon includes emissions from:
Material extraction and manufacturing.
Transport.
Construction and installation.
Maintenance, repair and replacement.
Operational energy and water use.
End-of-life demolition, reuse, recycling or disposal.
For many new assets, embodied carbon can represent a large share of total emissions—particularly in the early years of the asset’s life.
This means procurement teams need a common carbon language across designers, cost consultants, contractors, material suppliers and asset operators.
A credible carbon requirement should specify:
Which life-cycle stages are included.
Which calculation method or standard will be used.
What data quality is expected.
Which assumptions are acceptable.
How alternative designs will be compared.
How performance will be verified after delivery.
Without this clarity, carbon can become an inconsistent scoring exercise rather than a meaningful performance requirement.
Move from questions to weighted decisions
Many tender processes include sustainability questions. Too often, they are worth too little to influence the result.
If carbon performance matters, it needs meaningful weighting and clear evaluation criteria.
For example, a procurement exercise could assess:
Area | Example requirement |
|---|---|
Carbon baseline | Bidder provides a whole-life carbon estimate using a defined methodology |
Design optimisation | Bidder identifies options to reduce material use, avoid waste or retain existing assets |
Materials | Bidder provides environmental product declarations or equivalent evidence for major materials |
Delivery | Bidder sets out low-carbon logistics, plant, temporary works and construction methods |
Supply chain | Bidder identifies key suppliers and their carbon-data capability |
Innovation | Bidder proposes feasible alternatives with quantified carbon, cost, programme and risk implications |
Verification | Bidder commits to reporting actual versus forecast carbon performance |
The evaluation must be proportionate. Smaller projects do not require the same level of modelling as a major rail, energy or regeneration scheme. But every project can ask for clear evidence of the decisions that drive carbon.
Carbon and cost are not opposites
A common concern is that lower-carbon procurement will always cost more.
Sometimes it will. New materials, constrained supply chains, additional design work or unfamiliar construction methods can create higher upfront costs.
But carbon reduction can also reduce cost. Using less material, retaining existing structures, reducing waste, improving logistics, extending asset life and lowering energy demand can create savings.
The key is to evaluate value over the life of the asset, not only the initial contract price.
A lowest-cost tender can create higher future costs through energy use, maintenance, carbon exposure, regulatory change or asset obsolescence. A more resilient design may require greater upfront investment but reduce operating risk and whole-life cost.
Procurement needs to make those trade-offs visible.
Contracts must carry the carbon objective
A carbon target in a bid document is not enough. It needs to survive into the contract.
This can include:
A contractual carbon baseline.
A target for reduction or a carbon budget.
Defined data and reporting requirements.
Change-control rules that assess carbon impacts.
Incentives for verified reductions.
Clear ownership of carbon data.
A process for approving alternative materials or methods.
Requirements for post-project learning.
The objective is not to punish contractors for every uncertainty. It is to create a shared delivery model in which the client, designer, contractor and supply chain have reason to identify and implement practical improvements.
Carbon data is becoming a supplier capability
The move toward carbon-aware procurement is part of a wider shift.
Suppliers are increasingly being asked for product footprints, environmental product declarations, energy data, logistics information and evidence of material origin. This is happening through infrastructure procurement, CBAM, digital product passports, customer questionnaires and finance requirements.
For suppliers, carbon data is becoming a commercial capability.
The businesses that can provide credible evidence quickly will be better positioned to win work. Those that cannot may face additional cost, delays or exclusion from preferred-supplier lists.
This does not mean every SME needs a complex life-cycle assessment team. It means businesses need a proportionate evidence system: clear product data, supplier information, calculation methods, internal ownership and an ability to explain assumptions.
The next standard for low-carbon infrastructure
The next generation of infrastructure will not be defined only by what it delivers. It will also be judged by how it was designed, procured, built and operated.
Carbon procurement is not a side process. It is the mechanism that turns climate ambition into a project requirement.
For clients, the practical task is clear:
Set the carbon objective early.
Include carbon in options appraisal and design decisions.
Use meaningful evaluation criteria.
Require transparent evidence.
Put carbon commitments into contracts.
Measure actual performance and learn from delivery.
Low-carbon infrastructure will not emerge from better declarations alone. It will emerge from better decisions, made early enough to matter.