Data story: Tracking the green premium decline in low-carbon cement, steel, and timber

Why It Matters

In 2020, specifying low-carbon cement on a commercial project added 50 to 100 percent to the material cost. By early 2026, that premium has compressed to between 10 and 20 percent in leading European markets and as low as 5 percent for green steel in regions with abundant renewable electricity, according to the Energy Transitions Commission (2025). This rapid convergence changes the procurement calculus for developers, contractors, and policymakers. Building materials account for roughly 11 percent of global greenhouse gas emissions, with cement alone responsible for approximately 8 percent of anthropogenic CO2 and steel contributing another 7 to 9 percent (Global Alliance for Buildings and Construction, 2024). As embodied carbon regulations expand from voluntary leadership programmes to mandatory planning requirements, understanding precisely where the green premium stands today and where it is heading determines which organisations gain competitive advantage and which face stranded cost assumptions.

Key Concepts

Green premium is the additional cost of choosing a low-carbon alternative over the conventional product with equivalent structural performance. It is typically expressed as a percentage over the baseline price. A declining green premium signals that low-carbon technologies are scaling and that market conditions favour adoption.

Embodied carbon intensity measures the kilograms of CO2 equivalent emitted per unit of material produced (kgCO2e per tonne for cement and steel, kgCO2e per cubic metre for timber). The global average for ordinary Portland cement sits at approximately 620 kgCO2e per tonne (GCCA, 2025). Conventional blast-furnace steel averages around 2.0 tonnes of CO2 per tonne of crude steel, while electric arc furnace (EAF) steel using scrap and renewable electricity can achieve 0.3 to 0.5 tonnes (World Steel Association, 2025).

Cost parity is the point at which the low-carbon product costs the same as or less than the conventional alternative, eliminating the green premium entirely. Cost parity is not a fixed threshold but varies by region, energy mix, carbon pricing, and supply chain maturity.

Supplementary cementitious materials (SCMs) such as ground granulated blast-furnace slag (GGBS), fly ash, and calcined clay reduce clinker content and thereby reduce embodied carbon in cement by 30 to 50 percent without fundamental process changes. LC3 (limestone calcined clay cement) technology developed at EPFL can cut cement emissions by up to 40 percent at minimal additional cost.

Mass timber includes engineered wood products such as cross-laminated timber (CLT), glue-laminated timber (glulam), and laminated veneer lumber (LVL). These products sequester biogenic carbon, and when sourced from sustainably managed forests, they offer a carbon-negative material option relative to concrete and steel for mid-rise construction.

Carbon border adjustment mechanisms (CBAMs) impose costs on carbon-intensive imports. The EU CBAM, which began its transitional phase in October 2023 and moves to full financial adjustment in January 2026, directly affects cement and steel imports and compresses the effective green premium by raising the cost floor for conventional materials.

What's Working and What Isn't

Cement: Progress is real but uneven. The green premium for blended cements using SCMs has fallen sharply. HeidelbergMaterials reported in its 2024 annual results that its EcoCem product line (containing 50 to 70 percent SCM replacement) commands only a 10 to 15 percent premium over conventional Portland cement in Germany, down from over 40 percent in 2021. The Global Cement and Concrete Association (GCCA, 2025) estimates that blended cements now account for 35 percent of European production, up from 22 percent in 2020. However, novel pathways such as carbon capture on cement kilns and electrochemical processes remain expensive. Heidelberg's Brevik CCS project in Norway, the world's first full-scale cement carbon capture facility, became operational in 2024 but adds an estimated EUR 30 to 50 per tonne in capture and storage costs (Heidelberg Materials, 2024). This means fully decarbonised cement still carries a 25 to 40 percent premium, significantly higher than the blended approach. Demand-side pull is inconsistent: only 12 EU member states have introduced mandatory embodied carbon limits in building regulations (European Commission, 2025).

Steel: EAF expansion accelerates convergence. The green premium for low-carbon steel has narrowed faster than most analysts predicted. SSAB's HYBRIT fossil-free steel, produced using hydrogen direct reduction, reached commercial deliveries in 2025 at a premium of approximately 20 to 30 percent over conventional hot-rolled coil, down from over 50 percent during pilot production in 2021 (SSAB, 2025). The broader shift toward electric arc furnace production using scrap and renewable electricity is the larger story: EAF steel's share of global production rose to 32 percent in 2025, up from 28 percent in 2020, according to the World Steel Association (2025). In regions with low-cost renewable power, EAF steel already achieves cost parity with blast-furnace steel while delivering 60 to 75 percent lower emissions. ArcelorMittal's Sestao plant in Spain, running entirely on renewable electricity and scrap, produces steel with under 0.4 tonnes CO2 per tonne at competitive pricing. The challenge remains in primary steelmaking for high-purity applications, where hydrogen-based direct reduction requires green hydrogen at below USD 2 per kilogram to compete, a threshold most markets have not yet reached.

Timber: Carbon-negative but supply-constrained. Mass timber's green premium has effectively inverted in certain building typologies. A 2025 analysis by the Softwood Lumber Board found that CLT-framed mid-rise buildings (5 to 12 storeys) achieve 3 to 8 percent total project cost savings compared with equivalent concrete-framed designs when accounting for faster construction schedules, reduced foundation loads, and lower on-site labour requirements. Stora Enso reported a 28 percent increase in CLT sales volume in 2024, driven by demand in the Nordics, Central Europe, and increasingly North America (Stora Enso, 2025). However, supply chain constraints limit scaling. CLT manufacturing capacity in North America remains concentrated among a handful of producers, and lead times of 12 to 16 weeks deter time-sensitive projects. Additionally, mass timber faces regulatory hurdles: the 2024 International Building Code permits mass timber structures up to 18 storeys in the US, but local adoption varies and many jurisdictions still cap height at 6 storeys. Insurance pricing also adds friction, with premiums for mass timber buildings running 5 to 15 percent higher than concrete equivalents in many markets due to perceived fire risk, despite strong fire performance data from full-scale testing.

What isn't working. Carbon pricing alone has not been sufficient to close the green premium gap for the most capital-intensive decarbonisation pathways. At current EU ETS prices of approximately EUR 65 per tonne of CO2 (February 2026), the carbon cost adds only EUR 40 to a tonne of conventional cement, covering roughly half the premium for CCS-equipped production. Green public procurement mandates remain patchy. While the Netherlands, France, and Denmark have implemented maximum embodied carbon requirements for public buildings, the majority of OECD countries have not moved beyond voluntary standards. Data transparency is another gap: EPD (Environmental Product Declaration) coverage varies dramatically, with the US market having over 15,000 product-specific EPDs in the EC3 database (Building Transparency, 2025), while coverage in most Asian and African markets remains below 5 percent of production.

Key Players

Established Leaders

• HeidelbergMaterials — World's second-largest cement producer; operates the Brevik CCS facility and has committed to net-zero by 2050. EcoCem low-carbon product line available across 15 European markets.
• SSAB — Swedish steelmaker pioneering hydrogen-based direct reduction through HYBRIT; delivering fossil-free steel commercially since 2025.
• Holcim — Global cement leader with ECOPact low-carbon concrete range achieving 30 to 100 percent lower CO2. Available in 30+ countries with over 10 million cubic metres sold by end of 2024.
• ArcelorMittal — World's largest steel producer; operating XCarb recycled and renewably produced steel with facilities in Spain, Luxembourg, and Canada.
• Stora Enso — Europe's largest CLT manufacturer with production facilities in Austria, Finland, and the Czech Republic.

Emerging Startups

• Brimstone — California-based startup producing carbon-negative Portland cement from calcium silicate rock instead of limestone, eliminating process emissions.
• H2 Green Steel — Swedish venture building Europe's first large-scale green hydrogen steel plant in Boden, targeting 2.5 million tonnes annual capacity by 2026.
• CarbonCure Technologies — Canadian company injecting captured CO2 into fresh concrete, improving strength while permanently sequestering carbon. Technology deployed in over 800 concrete plants globally.
• Sublime Systems — MIT spin-out developing electrochemical cement production that operates at ambient temperature, eliminating the need for fossil-fuel-fired kilns.

Key Investors/Funders

• Breakthrough Energy Ventures — Bill Gates-backed fund with investments in Brimstone, CarbonCure, Boston Metal, and other low-carbon materials startups.
• European Investment Bank (EIB) — Providing concessional finance for industrial decarbonisation projects including cement CCS and green steel facilities.
• US Department of Energy (DOE) — Allocated over USD 6 billion through the Industrial Demonstrations Program for low-carbon manufacturing pilots, including cement and steel (DOE, 2025).

Examples

HeidelbergMaterials Brevik CCS, Norway. The world's first full-scale carbon capture facility on a cement plant became operational in late 2024, capturing 400,000 tonnes of CO2 annually for offshore geological storage. The project reduces the plant's emissions by approximately 50 percent and demonstrates the technical feasibility of CCS-equipped cement production, though at a premium of EUR 30 to 50 per tonne over conventional production (HeidelbergMaterials, 2024). Lessons learned include the importance of shared CO2 transport infrastructure (the Northern Lights pipeline) and long-term offtake agreements to underwrite capital investment.

SSAB HYBRIT commercial-scale deliveries, Sweden. SSAB began commercial-scale deliveries of fossil-free steel produced via hydrogen direct reduction in 2025, supplying automotive manufacturers including Volvo and construction equipment maker Epiroc. The green premium of 20 to 30 percent is contracted through multi-year offtake agreements with buyers willing to pay for verified near-zero emissions steel. The Oxelosund plant conversion from blast furnace to electric arc furnace, completed in late 2025, eliminates 3.4 million tonnes of annual CO2 emissions (SSAB, 2025).

Stora Enso CLT expansion for mid-rise housing, Finland and Austria. Stora Enso expanded CLT production capacity by 25 percent in 2024 to meet growing demand for mass timber construction in the residential sector. The company supplied CLT for the 20-storey Lighthouse Joensuu project in Finland, one of the world's tallest timber buildings, demonstrating structural performance at scale. Project data showed 75 percent lower embodied carbon compared with a concrete-framed equivalent, with total construction cost within 2 percent of the baseline design (Stora Enso, 2025).

Action Checklist

• Benchmark current material specifications against available low-carbon alternatives using EPD databases such as EC3, EPD International, or national equivalents.
• Quantify the project-specific green premium by obtaining quotes for low-carbon cement (blended/SCM), EAF or hydrogen-reduced steel, and mass timber for applicable structural elements.
• Set maximum embodied carbon intensity targets in procurement specifications (e.g., below 400 kgCO2e per tonne for cement, below 1.0 tCO2 per tonne for steel).
• Engage structural engineers early to evaluate mass timber feasibility for mid-rise projects, accounting for foundation savings and schedule compression.
• Monitor EU CBAM financial adjustments and national carbon pricing changes that affect the effective cost of conventional versus low-carbon materials.
• Negotiate multi-year supply agreements with low-carbon material producers to lock in pricing and secure allocation as demand grows.
• Require product-specific EPDs from all material suppliers and verify claims through independent third-party verification.
• Track green premium trends quarterly and update cost models to reflect convergence.

FAQ

When will the green premium for low-carbon cement reach zero? For blended cements using SCMs such as GGBS and calcined clay, cost parity is achievable in several European markets by 2027 to 2028, particularly as the EU CBAM raises the cost floor for carbon-intensive imports and as clinker-reduction technologies scale. For fully decarbonised cement using CCS or electrochemical processes, cost parity depends on carbon prices reaching EUR 120 to 150 per tonne and on shared CO2 transport infrastructure, which most analysts place in the 2032 to 2035 timeframe (Energy Transitions Commission, 2025).

Is green steel already cost-competitive? In specific market segments, yes. EAF steel produced from scrap using renewable electricity already achieves cost parity with blast-furnace steel in regions with low electricity prices, including parts of Scandinavia, the Iberian Peninsula, and the US Midwest. Hydrogen-based primary steel retains a 20 to 30 percent premium that depends heavily on green hydrogen pricing. At green hydrogen costs below USD 2 per kilogram, hydrogen DRI steel becomes competitive with conventional primary steel, a threshold expected in favourable geographies by 2028 to 2030.

Does mass timber really cost less than concrete for mid-rise buildings? Total project cost comparisons increasingly favour mass timber for buildings in the 5 to 12 storey range, though results are project-specific. The Softwood Lumber Board (2025) documented 3 to 8 percent total cost savings on CLT-framed projects when accounting for faster schedules (typically 25 to 30 percent shorter than concrete construction), lighter foundations, and reduced on-site labour. However, material cost per cubic metre for CLT remains higher than cast-in-place concrete, so the savings depend on realising schedule and labour efficiencies. Supply constraints and insurance premiums can erode the advantage in markets with limited CLT manufacturing capacity.

How does the EU CBAM affect green premium dynamics? The EU CBAM, entering full financial adjustment in January 2026, requires importers of cement, iron, and steel to purchase certificates reflecting the embedded carbon of their imports. This raises the landed cost of carbon-intensive imports and effectively narrows the green premium by increasing the baseline price. For cement, CBAM is estimated to add EUR 15 to 30 per tonne to imported clinker at current EU ETS prices, making domestically produced low-carbon alternatives more competitive (European Commission, 2025).

What data sources can I use to track green premium trends? Building Transparency's EC3 database provides product-specific EPD data for over 15,000 construction products in the US. The GCCA publishes annual cement sustainability progress reports with emissions intensity benchmarks. The World Steel Association releases annual statistical yearbooks with EAF production share and emissions data. For timber, national forest products associations and CLT manufacturers publish pricing indices. Commercial platforms such as CarbonChain and Systemiq provide subscription-based green premium tracking across materials and geographies.

Sources

• Energy Transitions Commission. (2025). Material Economics: Green Premium Tracker for Industrial Decarbonisation. Energy Transitions Commission.
• Global Alliance for Buildings and Construction. (2024). 2024 Global Status Report for Buildings and Construction. UN Environment Programme.
• Global Cement and Concrete Association. (2025). GCCA Sustainability Progress Report: Clinker Ratio and Blended Cement Adoption Trends. GCCA.
• World Steel Association. (2025). Steel Statistical Yearbook 2025: Electric Arc Furnace Production Share and CO2 Intensity. World Steel Association.
• HeidelbergMaterials. (2024). Brevik CCS Project: Operational Commissioning and Cost Analysis. HeidelbergMaterials Annual Report 2024.
• SSAB. (2025). HYBRIT Fossil-Free Steel: Commercial Deliveries and Emission Reduction Results. SSAB.
• Stora Enso. (2025). Mass Timber Market Update: CLT Sales Volume and Project Pipeline. Stora Enso Annual Report 2024.
• Building Transparency. (2025). EC3 Database: Product-Specific EPD Coverage and Embodied Carbon Benchmarks. Building Transparency.
• European Commission. (2025). Carbon Border Adjustment Mechanism: Implementation Report and Impact Assessment. European Commission.
• US Department of Energy. (2025). Industrial Demonstrations Program: Funded Projects and Allocations for Low-Carbon Manufacturing. DOE Office of Clean Energy Demonstrations.
• Softwood Lumber Board. (2025). Mass Timber Cost Competitiveness Study: Mid-Rise Building Comparisons. Softwood Lumber Board.