July 1 is the cutoff.
After that date, no new LEED v4.1 project registrations will be accepted, and every new LEED project will have to comply with v5. The headline change isn’t another credit category — it’s that whole-building life cycle assessment for embodied carbon is now a prerequisite for certification, not an optional credit. Roughly half of v5’s available credits are tied to decarbonization across operational, embodied, and transport categories.
It is the most consequential rewrite of LEED since v4 dropped in 2013.
What “Prerequisite” Means in Practice
Under v4 and v4.1, embodied carbon was a credit option in the Materials and Resources category. Project teams could pursue it or skip it. Most skipped it. USGBC data showed less than 30% of certified projects opted into the credit, largely because the calculation overhead didn’t pay back in points.
Under v5, every certified project — Silver, Gold, or Platinum — has to report whole-building global warming potential covering the structure, enclosure, and hardscape elements. The report itself is the bar; teams don’t have to hit a specific kgCO2e/m² number to earn the base certification, but the data has to be submitted, methodology-compliant, and reviewable.
For specifying architects and structural engineers, that means EPDs (Environmental Product Declarations) for concrete, steel, insulation, and glazing are no longer “nice to have.” They’re table stakes. Concrete mix submittals will need GWP values for every strength class. Steel package buyouts will need EAF-vs-BOF traceability. Curtain wall scopes will need glass-by-pane EPDs and aluminum mill-source documentation.
For owners pursuing higher tiers, the embodied carbon credits available beyond the prerequisite scale up to substantial point counts — enough to anchor a Gold or Platinum push when paired with operational decarbonization.
What This Actually Changes on the Bid Sheet
LCA software vendors are the obvious winners. One Click LCA, Tally, and EC3 have all rolled out v5-aligned templates in the past quarter. Expect those tools to move from optional consultant deliverables to standard architect/engineer scope items on most LEED-targeted projects.
Concrete suppliers are positioning for it. The big national ready-mix players have moved their GWP reporting into customer-facing portals. Holcim, CRH, and Heidelberg Materials have aligned product lines with calcined clay (LC3) and Portland-limestone (PLC) cement options as low-GWP alternatives. Both have been the subject of recent industry coverage on Exchange (see our recent piece on LC3 scaling and PLC adoption across state DOTs).
Structural steel will be the harder conversation. Domestic mills that run on EAF (electric arc furnace) have a credible low-GWP story. Imported BOF steel doesn’t. Combined with the current 50% steel tariff, the embodied carbon math now pushes designers further toward domestic procurement, which is part of the political point of the tariff regime.
Where the Friction Will Be
Three areas to watch over the next 12 months.
First, federal projects. GSA and the Department of Defense have separate “Buy Clean” embodied carbon thresholds that don’t perfectly map to LEED v5. Owners targeting both will be running parallel reporting systems.
Second, residential. LEED for Homes v5 is on a different rollout schedule and the embodied carbon prerequisite isn’t binding the same way yet. Multifamily teams need to verify which scheme they’re under.
Third, retroactive comparisons. v5’s GWP reference values have been updated to reflect 2024 industry averages, which means scoring a project today against the same physical building scored under v4.1 will produce different numbers. Owners trying to maintain “year over year carbon reduction” reporting through the transition will need to footnote the methodology change carefully.
The takeaway for project teams running between now and July 1: if you have a project on the borderline of registration, registering under v4.1 before the cutoff is still legitimate and may save you a quarter of integration overhead. Anything after July 1 is v5 — and the embodied carbon scope sheet better be in the design package already.