Sustainability in Construction

Industry Overview

Construction is responsible for a large share of global greenhouse gas emissions through embodied carbon in building materials: the cement, steel, and aluminum used in buildings alone accounted for about 9% of global emissions in 2024, according to UNEP's Global Status Report for Buildings and Construction 2025–2026. When combined with the operational emissions of completed buildings, the buildings and construction sector accounts for around 37% of global carbon emissions. This makes construction one of the most consequential sectors for climate action, yet it remains one of the slowest to adopt sustainable practices.

The industry's structure contributes to the challenge. Construction is highly fragmented, with millions of firms operating across complex project delivery chains. Margins are thin—industrial and nonresidential contractors averaged a 4.4% pre-tax margin in 2024, according to CFMA's 2025 Construction Financial Benchmarker—creating resistance to any cost premium associated with sustainable materials or practices. Decision-making is distributed among owners, architects, engineers, general contractors, and subcontractors, each with different incentives and information. Innovation adoption is notoriously slow, with industry productivity growth lagging virtually every other sector for decades.

Despite these headwinds, change is accelerating. Whole-life carbon assessment is becoming standard practice in leading markets. Environmental Product Declarations (EPDs) are enabling material-level carbon comparisons. Governments are implementing buy-clean policies that require low-carbon materials in public projects. And a growing body of evidence demonstrates that low-carbon construction can be achieved at cost parity or near-parity with conventional approaches when design teams engage early and think systematically.

Key Sustainability Challenges

Embodied Carbon in Materials

Concrete is the most widely used man-made material on earth, and cement production alone accounts for about 7% of global CO2 emissions, according to the Global Cement and Concrete Association. Steel contributes another 7-8% of global greenhouse gas emissions, according to worldsteel. Reducing embodied carbon requires a combination of strategies: material substitution (supplementary cementitious materials, mass timber, recycled steel), structural optimization (using less material through better design), and process decarbonization (green hydrogen for steelmaking, carbon capture at cement plants). Each approach is at a different stage of commercial readiness.

Jobsite Waste and Resource Efficiency

Construction and demolition waste represents approximately 600 million tons annually in the U.S.—more than twice the volume of municipal solid waste. In 2018, about 144 million tons of it went to landfills, according to EPA. While recycling rates for materials like concrete and steel are relatively high, wood, drywall, insulation, and mixed waste often end up in landfills. Reducing waste requires better design (modular construction, standardized dimensions), improved site management (material tracking, waste segregation), and stronger markets for recycled construction materials.

Workforce and Safety

The construction industry faces chronic labor shortages: Associated Builders and Contractors estimates the U.S. industry must attract 349,000 net new workers in 2026 just to keep labor supply and demand in balance. Sustainable construction practices—including prefabrication, modular construction, and building information modeling (BIM)—can improve productivity and working conditions, helping attract and retain workers. However, these approaches require workforce training and cultural change in an industry where traditional methods are deeply entrenched.

Regulatory Landscape

Buy-clean policies are proliferating at the state level. The U.S. Federal Buy Clean Initiative, which prioritized low-carbon steel, concrete, asphalt, and flat glass in federal projects, lost its basis when Executive Order 14057 was revoked in January 2025, and the July 2025 budget law (P.L. 119-21) rescinded unspent Inflation Reduction Act funds for low-carbon materials in federal buildings and transportation projects. States now carry the weight: the Buy Clean California Act sets maximum global warming potential limits for structural steel, rebar, flat glass, and mineral wool insulation in state projects (updated in January 2025), Colorado sets limits for materials including asphalt, concrete, glass, and steel, and New York and other states have adopted or are developing similar requirements. The EU's revised Construction Products Regulation, which applies from January 2026, will phase in requirements for manufacturers to declare life-cycle environmental data, including global warming potential, as new harmonized product standards are published.

Building codes are evolving to address embodied carbon alongside operational energy. Several jurisdictions—including Vancouver, the Netherlands, and Denmark—already require whole-life carbon assessments for new buildings, and the EU's recast Energy Performance of Buildings Directive requires life-cycle global warming potential to be calculated and disclosed for new buildings over 1,000 square meters from 2028 and for all new buildings from 2030.

Waste diversion requirements vary by jurisdiction. Many cities and states mandate construction and demolition waste recycling or diversion, with rates typically ranging from 50-75%. The EU's Waste Framework Directive targets 70% recovery of construction and demolition waste.

Opportunities

Low-carbon materials are reaching commercial scale and cost competitiveness. Supplementary cementitious materials (fly ash, slag, calcined clay) can substantially reduce concrete's carbon footprint with minimal cost impact. Mass timber construction is growing rapidly, with cross-laminated timber (CLT) enabling wood buildings up to 18 stories. Recycled steel produced in electric arc furnaces carries 60-75% lower emissions than virgin steel from blast furnaces.

Offsite and modular construction methods reduce waste compared to conventional site-built approaches while improving schedule predictability and quality control.

Digital tools—BIM, digital twins, and material passports—enable better design optimization, waste reduction, and end-of-life material recovery planning. Companies that invest in digital capabilities gain both productivity and sustainability advantages.

How Council Fire Can Help

Council Fire works with general contractors, developers, architects, and material suppliers to integrate sustainability into project delivery and business strategy. We conduct whole-life carbon assessments, develop material procurement strategies that minimize embodied carbon, and support EPD development and interpretation. Our team helps contractors establish waste diversion programs, measure and report project-level emissions, and pursue green building certifications.

For companies navigating buy-clean compliance, we provide gap analysis, EPD readiness assessments, and procurement strategies that meet carbon intensity thresholds. We understand construction's commercial pressures and focus on solutions that are technically sound, cost-competitive, and implementable within real project timelines.

Frequently Asked Questions

What is an Environmental Product Declaration and why does it matter?

An EPD is a standardized, third-party verified document that reports the environmental impacts of a product across its lifecycle, based on lifecycle assessment (LCA) methodology and governed by ISO 14025 and EN 15804 standards. EPDs quantify impacts including global warming potential, ozone depletion, acidification, and resource depletion. They matter because buy-clean policies increasingly require EPDs as a condition of product eligibility, and specifiers use them to compare the carbon intensity of competing products. For manufacturers, having EPDs is becoming a market access requirement rather than a differentiator.

How much does low-carbon construction actually cost compared to conventional?

RMI's 2021 case studies of mid-rise office, multifamily, and tilt-up buildings found embodied carbon reductions of 19-46% at cost premiums of less than 1%, achieved through choices made during design and specification. Structural optimization alone—using less material through better engineering—often reduces both cost and carbon simultaneously. Material substitution costs vary: supplementary cementitious materials in concrete are often cost-neutral or cost-saving, while mass timber may carry a premium on structural framing but offers savings in construction speed and foundation sizing. The key variable is when sustainability enters the conversation—retrofitting low-carbon specifications onto a completed design is expensive, while designing for low carbon from the start is not.

What is whole-life carbon and how is it different from operational carbon?

Whole-life carbon encompasses both embodied carbon (emissions from material extraction, manufacturing, transportation, construction, and end-of-life) and operational carbon (emissions from energy used to heat, cool, light, and operate the building over its lifetime). Historically, building regulations focused exclusively on operational energy. As buildings become more energy-efficient and grids decarbonize, embodied carbon represents an increasingly large share of whole-life emissions—often 50% or more for high-performance new buildings. Whole-life carbon assessment provides a complete picture and prevents burden-shifting between embodied and operational phases.