LEED v5 Materials & Resources: Embodied Carbon Takes Centre Stage

For years, a building's "carbon" meant the energy it used in operation. But the concrete, steel and glass that make up the structure carry their own — embodied carbon, emitted before anyone moves in. LEED v5's Materials & Resources (MR) category makes that previously optional concern mandatory, reflecting the fact that roughly half of LEED v5 is now about decarbonization. This is part six of our series walking through the categories of LEED v5.

Two new foundations

The category now rests on two prerequisites every project must meet:

• Quantify & Assess Embodied Carbon — measure the embodied carbon (global warming potential) of the project's structure, enclosure and hardscape, identify the top three sources, and describe the strategies considered to reduce them.
• Planning for Zero Waste Operations — create a plan to minimise waste sent to landfill, with estimates, measurable reduction goals, and policies for recycling, composting and reuse.

The first is the bigger shift: simply measuring embodied carbon is now the price of entry. We cover the mechanics in depth in LCA & Embodied Carbon in LEED v5.

The Reduce Embodied Carbon credit

Beyond measuring, projects are rewarded for cutting embodied carbon. The Reduce Embodied Carbon credit awards points by percentage reduction in global warming potential — roughly two points at baseline, rising to around six points for a 40% or greater reduction — through three flexible pathways:

• Whole-building life-cycle assessment — a cradle-to-grave (modules A–C) study of the building's materials.
• EPD analysis — comparing products against industry-average baselines using Environmental Product Declarations.
• Construction emissions tracking — measuring and reducing jobsite emissions, now explicitly counted.

In practice this rewards low-carbon concrete, mass timber and engineered wood, bio-based insulation, and salvaged or reused materials.

Better products and circularity

A new Optimized Building Products credit rewards materials that carry credible environmental and health declarations, scored using a matrix based on the Mindful Materials Common Materials Framework. Alongside it, the category keeps rewarding building and material reuse, construction-and-demolition waste diversion, and designing for circularity — choosing products that can be recovered and returned to the supply chain rather than landfilled.

How it connects to the rest of LEED v5

Embodied carbon is the counterpart to the operational carbon tackled in Energy & Atmosphere. Together they cover a building's whole-life carbon — and the embodied-carbon assessment ties back to the carbon thinking introduced by the Integrative Process. As operational emissions fall with cleaner grids, the embodied share grows in importance, which is exactly why LEED v5 elevated it.

What it means for project teams

Engage the structural engineer and an LCA early — the structure is usually the largest source of embodied carbon, and the cheapest time to reduce it is during scheme design. Run an early life-cycle assessment to find your top emitters, collect EPDs from suppliers, and plan construction-waste and reuse strategies before demolition begins. Measuring early turns the embodied-carbon prerequisite into points rather than a last-minute scramble.

This article is general guidance and reflects information available at the time of writing. LEED v5 requirements are defined by USGBC and may be updated — always confirm current requirements in the official rating system for your project.