855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 043
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sources of emissions will compare over a 10-year time horizon, to enable better decisionmaking about carbon.
Carbon Assessment Supplied by USGBC
From the data in the three prerequisites and the optional credit, USGBC will develop a 10-year carbon assessment of the estimated emissions from energy use, refrigerants, embodied carbon, and, for some projects, transportation. It includes:
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Annual carbon emissions from each source for 10 years
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Cumulative emissions from each source each year for 10 years
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Cumulative emissions over 10 years in total and from each source and the percentage of the total from each source
Additional considerations The information in this carbon assessment provides an overview of the various sources of carbon emissions and helps tenants make informed decisions to reduce the project’s emissions. Although not required for compliance, sharing the 10-year carbon projection with additional parties, including the landlord, can benefit. Landlords may find value in this information and develop a way of measuring and reporting emissions from the whole building or other projects within their portfolio.
This prerequisite does not require comprehensive carbon accounting, wholebuilding life cycle analyses (WBLCA), or “whole-interiors” LCA, nor is it meant to substitute for more in-depth analysis. Instead, LEED v5 requires this basic crosscategorical carbon assessment to enable a broad understanding of how project emissions across sources will add up over time, using data that all LEED v5 projects must submit under other prerequisites and applying reasonable assumptions.
Assumptions Behind the Assessment
While project teams do not need to compile any calculations to complete this credit, the following section outlines the assumptions behind the USGBC-supplied carbon assessment for full transparency. Project teams should conduct their own analysis in addition to this Carbon Assessment if more customized results are desired.
U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 32