The carbon is spent before anyone moves in. That used to be invisible.
For decades the climate question for a building was how it ran. The carbon locked into cement, steel, glass and insulation at construction went uncounted, because operational emissions dwarfed everything else. As buildings have become more energy efficient that has flipped. The emissions spent before anyone moves in are now a large and rising share of a building's footprint, and they cannot be reduced once the structure is up. The European Union and several national governments are starting to measure that embodied carbon, and then to cap it, which moves the climate question from how a building runs to what it is made of.
And it is moving onto a material palette that cannot yet absorb it. Concrete is the most-used manufactured substance on the planet, cement alone is around 8% of global CO2, and construction and demolition account for a large share of all waste. The carbon in those materials is increasingly priced through the EU Emissions Trading System and the Carbon Border Adjustment Mechanism, while the biobased alternatives that could store carbon rather than emit it are still a small share of supply. So the bill is arriving exactly where the cheap, high-carbon option is hardest to displace, which is what turns embodied carbon from a sustainability talking point into a commercial problem.
The supply chain
Biobased Building value loop
The outer ring is the construction value chain. Purple shows raw inputs entering the system, with biomass distinguished because it brings stored carbon rather than emissions. The inner arcs are circular loops that return material or value to an earlier stage, coloured by how much is retained. The clay arrow is downcycled material that stays in use, and the red arrows are carbon and material lost at construction and end of life.
R-ladder · value kept in the loop
- R0–R2Smarter use & design cuts virgin inflowRefuse, rethink, reduce
- R3–R7Extend lifespanReuse, repair, refurbish, repurpose
- R8RecycleMechanical & chemical recycling
- R9Recover energyEnergy recovery
Reserved channels · never used on the ladder
- virginVirgin inputVirgin cement, steel, sand and aggregates; Biomass: timber, hemp, straw, bio-derived additives
- cascadeCascadeDowncycled aggregate and rubble
- leakageLeakageLandfill, incineration & emissions
- chainThe chainPrimary value chain path
The problem from where you sit
CEO, CFO or developer
The carbon you used to ignore is becoming a permit condition and an asset-value question.
For decades the carbon in the materials you bought was someone else's problem, and what mattered for the asset was how the building ran once it was up. That is over. The recast EPBD turns the carbon in your structure into a number that has to be disclosed and, from 2030, stay under a national limit, while ETS and CBAM make the conventional material palette progressively more expensive. The variable you control is whether you design to the carbon limit and secure lower-carbon supply early, ahead of the 2028 and 2030 thresholds, or redesign and re-procure late when the assessment fails. Low-carbon and biobased materials become a compliance and asset-value move, not green spend.
Design, procurement or sustainability manager
Three decisions you used to make separately are now wired together.
Design, procurement and sustainability used to sit in different lanes on different desks. The new rules connect them, and the connection is where the exposure sits. Design owns the whole-life-carbon calculation and the specification that drives it. Procurement owns the supply, cost and product data behind the lower-carbon and biobased materials the calculation depends on. Sustainability owns the reporting and the link to wider disclosure. You can no longer fix your own lane and pass the problem on, because your decision is now the input to someone else's compliance, and the lever sits at design stage rather than in the report at the end.
Site, studio or specification desk
The over-specified material you have always seen is about to carry a number.
You are the one who notices it first: the structural element thicker than it needs to be, the mix specified for a load it will never carry, the biobased option that would do the same job. For years those were quiet inefficiencies that never reached a report, and raising them changed little. Under the new rules each one becomes measured embodied carbon tied to a specific building. The difficulty is structural: the people specifying mixes and sections are usually not the ones who see the over-spec, and by the time it is visible the concrete is poured. What you notice is now commercially material, and it is only worth anything if it reaches the design decisions early, while the building can still change.
A low-carbon line is not a low-carbon building
None of this is solved by swapping one material and calling the building sustainable. Whole-life-carbon limits, the carbon pricing on conventional materials, and the supply of biobased alternatives are separate things with separate owners and timelines. Switch one product and you may still miss the building's whole-life-carbon limit, which is a design-level calculation, not a single specification. Source a biobased material and you still have to evidence its carbon with the data the rules require. Treating them as one problem is how a project specifies a green material while missing the embodied-carbon target across the rest of the build. So the honest first question is not which material to swap, but which pressure binds first for the project.
The rules behind it, and when they bite
The regulatory force on construction lands in two connected instruments. The recast Energy Performance of Buildings Directive makes the whole-life carbon of new buildings, including the embodied carbon in materials, a number that must be calculated, disclosed, and then capped. The revised Construction Products Regulation requires every product to declare its life-cycle environmental performance and introduces a digital product passport. Together they turn embodied carbon from an invisible cost into a measured and disclosed one that will soon be limited, and they make the carbon footprint of every material a procurement and design variable.
8 May 2024
EPBD
Recast EPBD enters into force
In force2026 to 2032
CPR
Construction Products Regulation environmental declarations and digital product passport phase in
Upcoming1 Jan 2028
EPBD
Whole-life-carbon disclosure for new buildings above 1,000 m²
Upcoming1 Jan 2030
EPBD
Whole-life-carbon disclosure for all new buildings; national GWP limit values apply
Upcoming
For a developer or contractor this turns the choice of material into a number that has to be reported and will soon have to stay under a limit. A high-carbon material is no longer just an environmental concern but a compliance and valuation risk, and a lower-carbon or carbon-storing material becomes a way to meet the cap. The decision moves upstream to design, because that is the only point at which embodied carbon can still be changed.
The cost of high-carbon materials comes home
The second force is structural, and it is the repricing of the materials themselves arriving on a palette that cannot yet swap them out cheaply. Cement and steel are among the most carbon-intensive substances in the economy, and their carbon is increasingly priced, through the EU Emissions Trading System on European production and the Carbon Border Adjustment Mechanism on imports. As that cost feeds through, high-carbon materials get more expensive relative to low-carbon ones, and the embodied-carbon figure regulators will soon cap becomes a direct cost line.
At the same time the alternative palette is not yet built to scale. Biobased materials can store the carbon a plant captured as it grew and can be produced on agricultural land rather than quarried or smelted, but timber, hemp and bio-derived additives are still a small share of supply, the agricultural value chains behind them are thin, and the way biogenic carbon is credited inside whole-life-carbon calculations still varies. Behind that sits insurance, building codes and procurement culture written around concrete and steel, which slows adoption even where the lower-carbon option is technically ready. The structural pressure is the collision between a material palette whose carbon is being priced and capped and a low-carbon alternative whose supply, accounting and acceptance are not yet at the scale the rules assume.
The carbon, with nowhere cheap to hide
The carbon in conventional materials is being priced and will soon be capped, while the low-carbon palette that should replace it is the part of the chain least built and least trusted. The two do not meet, and the cost sits in the gap.
Carbon priced, soon capped
Conventional palette repriced
EU ETS on domestic cement and steel and CBAM on imports turn embodied carbon into a direct material cost.
Whole-life-carbon limits
EPBD requires disclosure from 2028 and national GWP limit values from 2030, with a downward trajectory after that.
No low-carbon palette at scale
Biobased supply thin
Timber, hemp and bio-derived additives are a small share of supply, with agricultural value chains still being built.
Accounting unsettled
How stored biogenic carbon is credited inside whole-life-carbon calculations still varies, so biobased advantage is not always counted.
Codes and insurance lag
Building codes, insurance terms and procurement culture are written around concrete and steel, slowing adoption of ready alternatives.
The developer pays the cost
Repriced materials and an immature low-carbon palette do not meet. The cost sits in the gap, and whole-life-carbon rules make it the developer's to carry.
For a developer this is the pressure with no single deadline and no quick fix. The carbon cost of the conventional palette is rising while the low-carbon one is still being built, so the cheapest response is to design to the lower-carbon outcome and secure the supply early, before the squeeze tightens rather than after.
How circular each market really is
Geography is the heading. The circularity figure sits beneath it as a sourced indicator. The metric name distinguishes the economy-wide Eurostat rates from the global Circularity Gap figure, so the number is never mistaken for a construction-specific recycling rate.
European Union
12.2% circular material use, Eurostat 2024
The EU is making embodied carbon visible and then binding, and the rules reach any developer or product manufacturer placing on the single market regardless of where it is based.
- Whole-life carbon disclosure, recast Energy Performance of Buildings Directive (EPBD) 2024/1275: new buildings above 1,000 m² from 1 January 2028, all new buildings from 1 January 2030
- National GWP limit values for new buildings from 2030, with a downward trajectory after that, calculated on EN 15978
- Construction Products Regulation (CPR) 2024/3110: declaration of life-cycle environmental performance and a construction digital product passport, phased in 2026 to 2032
- Carbon pricing: EU Emissions Trading System on European cement and steel and the Carbon Border Adjustment Mechanism (CBAM) on imports
International
6.9% global circularity, Circularity Gap Report 2026
Outside the EU embodied-carbon rules are uneven but spreading, and a producer of low-carbon or biobased materials built to the strictest standard carries that advantage into every market.
- United Kingdom: Part Z industry proposal to mandate whole-life-carbon assessment, with several local authorities already requiring it on major projects
- United States: Buy Clean federal procurement and state-level embodied-carbon rules (California Buy Clean, New York, Colorado) setting limits on materials in public projects
- Carbon pricing on cement and steel is spreading unevenly through national schemes and CBAM-style border measures
- Direction of travel: embodied-carbon rules are tightening rather than relaxing, with the EU framework the practical global benchmark
Netherlands
32.7% circular material use, Eurostat 2024
The Netherlands has the EU's highest circular material use rate and was already running a binding embodied-carbon rule before the EPBD, so the question here is supply and accounting rather than intent.
- MilieuPrestatie Gebouwen (MPG): mandatory environmental performance limit for new buildings as a condition of the building permit, tightening over time and moving onto the European calculation basis
- Nationale Aanpak Biobased Bouwen (National Approach to Biobased Building), launched 2023: target for a large share of new homes to use a meaningful share of biobased materials by 2030, with public funding behind it
- Tied to the country's nitrogen and climate goals, with farmers paid to grow biobased construction crops as a new land use
- Open question: how stored biogenic carbon is credited in MPG and EU calculations, which still shapes how favourably biobased materials score
Ireland
2.0% circular material use, Eurostat 2024
Ireland has one of the EU's lowest circular material use rates and comes at embodied carbon from the demand side, through one of the largest building programmes in Europe.
- Cement is Ireland's single largest source of industrial process emissions, which makes the carbon in concrete the central question
- Public procurement: whole-life-carbon assessment required on larger publicly funded projects ahead of the EU 2028 deadline
- Climate Action Plan target: a significant cut in the embodied carbon of construction materials by 2030
- Scale of the build: housing and infrastructure targets lock in embodied carbon fast, so material substitution has to happen at procurement speed rather than research speed
Where does this leave you?
Five statements about the rules and pressures now hitting construction. Count the ones you can honestly say yes to. The gaps are where the cost and the exposure sit, and where to start.
- 1. We calculate the whole-life carbon of our projects, including embodied carbon, at the design stage.
- 2. We know which of our buildings will fall under the 2028 and 2030 whole-life-carbon requirements.
- 3. We can compare materials by their embodied carbon using product-level environmental data.
- 4. We have identified where lower-carbon or biobased materials could replace high-carbon ones without losing performance.
- 5. We factor the rising carbon cost of cement and steel into our material and design decisions.
Answer all five statements to see your readout.