US construction embraces low-carbon materials to accelerate net zero progress in 2025

The US construction industry is undergoing a significant transformation in 2025 as it strives to meet stringent climate mandates and rising investor demands for sustainability. With nearly 11 percent of global carbon emissions attributed to construction materials and processes, the choice of building materials has become a critical lever in reducing embodied carbon and achieving net zero goals. This shift is evident in the adoption of innovative low-carbon materials that promise both environmental benefits and high-performance outcomes.

Among the leading solutions is recycled steel, prized for its strength and drastically lower carbon footprint compared to virgin steel. The US steel industry boasts impressive circularity, recovering over 98 percent of structural steel from demolition for reuse. Such efficiency reduces emissions by more than 70 percent when produced in electric arc furnaces, making recycled steel a favoured material in public infrastructure and commercial projects. Developments in green steel production, including hydrogen-based reduction, are further pushing the carbon intensity of steel downward, aligning well with LEED certifications and Environmental, Social, and Governance (ESG) criteria that influence real estate investment decisions.

Concrete, accounting for nearly eight percent of global CO₂ emissions due to cement production, is seeing substantial innovation through low-carbon blends. These blends incorporate supplementary cementitious materials like fly ash and slag to replace a portion of Portland cement, cutting embodied carbon by up to 50 percent without sacrificing durability or strength. Major US ready-mix suppliers now provide verified Environmental Product Declarations (EPDs), assisting contractors in navigating emerging embodied carbon caps. This innovation is particularly salient in large-scale infrastructure projects such as bridges and airports, where low-carbon concrete is increasingly standard.

Mass timber also emerges as a transformative material, with technologies like cross-laminated timber enabling mid- to high-rise construction that locks in carbon rather than releasing it. Studies published in the Journal of Building Engineering highlight reductions in embodied carbon of 30 to 45 percent compared to traditional materials, while prefabrication methods reduce waste and expedite construction timelines. Supported by progressive building codes and sustainable forestry incentives, mass timber is gaining traction in urban schools, offices, and mixed-use developments, valued not only for its green credentials but also for its acoustic and aesthetic qualities.

Complementing these materials are insulated concrete forms (ICFs), which combine structural concrete with built-in insulation to achieve better thermal efficiency and material reduction. According to the US Department of Energy, buildings constructed with ICFs can reduce energy consumption by 20 to 30 percent compared to conventional methods, thus lowering both operational and embodied carbon. ICFs are gaining popularity particularly in climate-sensitive regions and residential sectors, where their durability and speed add value.

Emerging carbon-negative materials like Ferrock offer a glimpse into the future. This innovative cement alternative uses recycled steel dust and industrial waste, absorbing CO₂ during curing and providing superior strength and corrosion resistance. Although still in the pilot phase, such materials are gaining attention in sustainable design circles and may become essential in net zero building codes as cities and states pursue more ambitious emissions targets. Parallel innovations include magnesium oxide cements and carbon-absorbing aggregates, which are under real-world evaluation.

Reclaiming demolition materials is another potent strategy for embodied carbon mitigation. Salvaging wood, metal, brick, and other components from existing structures preserves the embodied energy of these materials, reducing demand for new production. Organisations like the Building Materials Reuse Association are formalising supply chains and standards, with some municipalities incentivising reuse through tax credits and zoning benefits. Increasingly, adaptive reuse and public infrastructure projects are embracing this approach for its cost-effectiveness and sustainability.

Plant-based insulation products such as hempcrete, cellulose, cork, and wood fibre are similarly gaining ground. Offering strong thermal and acoustic performance without the high emissions burden of petrochemical-based alternatives, these biobased insulations improve indoor air quality and occupant wellness. States like California and Oregon are pioneering building codes that encourage their use, reflecting a broader trend towards healthier, greener construction materials.

Supporting these material shifts are industry-wide efforts to optimise construction processes and design efficiency, aimed at further carbon reductions. The Portland Cement Association, for example, advocates for minimising waste and refining structural design to cut construction emissions by 30 percent by 2050. The National Renewable Energy Laboratory underscores the importance of innovative production methods, carbon capture technologies, and low-carbon materials in decarbonising the cement sector, responsible for roughly eight percent of CO₂ emissions worldwide.

Reflecting an industry-wide commitment, Amazon Web Services (AWS) has integrated lower-carbon concrete and steel into 43 of its data centres as part of its net-zero carbon pledge for 2040, setting an example for sustainable digital infrastructure. Complementary research from KPFF Consulting Engineers shows that ultra-low carbon concrete masonry units can reduce embodied carbon in concrete walls by up to 70 percent without additional cost, a vital breakthrough for green data centres and beyond.

In sum, 2025 marks a pivotal year where material choice intersects directly with climate strategy in US construction. From recycled steel and low-carbon concrete to mass timber and bio-based insulation, contractors are equipped with a growing arsenal of sustainable materials that reduce embodied carbon without compromising quality or cost. As embodied carbon regulations tighten and ESG criteria shape investment, adopting these innovations is not just environmentally necessary but increasingly commercially imperative. The trajectory is clear: material selection now stands at the forefront of industrial decarbonisation efforts, driving the transition to greener, more resilient buildings across the nation.