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An Environmental Product Declaration (EPD) gives designers standardized, life-cycle-based information about a product’s environmental impacts and the assumptions behind those results. Use it to understand what a product’s declaration covers; compare two products only when their rules, functions, units, life-cycle scope, methods and validity are sufficiently aligned.
An EPD is not a “green” certification or a complete product ranking. Its figures are useful design evidence, but they need to be read in context: a lower result in one indicator or life-cycle stage does not by itself establish that a product is environmentally preferable overall.
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What is an Environmental Product Declaration?
An Environmental Product Declaration is a standardized report of selected environmental impacts associated with a product over specified life-cycle stages. It is based on a life-cycle assessment (LCA) conducted under Product Category Rules (PCRs), which define how products in a category are assessed and what an EPD must report. Architecture 2030 describes an EPD as a Type III environmental label based on LCA and pre-defined PCRs in its EPD FAQ.
For a designer, the value is structured disclosure: an EPD can show impacts such as greenhouse-gas emissions and, depending on the applicable rules, other indicators such as resource use, acidification, eutrophication and waste. The declared results come with boundaries, units, methods and assumptions. Those details determine what a number means—and whether it can answer the question a project is asking.
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An EPD does not certify that a product is “green,” guarantee that it is the best choice, or replace technical product information. It reports environmental results under stated rules. Design decisions still need to account for the product’s intended function, technical performance, service life, quantity, installation, replacement and end-of-life scenario where those factors matter.
Why do the PCR and scope matter before the headline number?
The PCR and declared scope determine how an EPD’s results were calculated and what they include. Two documents can use the same impact label, such as global warming potential, yet present results that are not fair to compare because their rules, units or life-cycle coverage differ.
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Requirements vary by geography, product category, program and project. For example, USGBC’s guidance references EN 15804 or ISO 21930 in the context of its EPD credit requirements. Those references describe that credit context; they do not create a universal rule for every design decision. Check the current requirements of the relevant rating system, client, jurisdiction or procurement policy rather than assuming one standard applies everywhere.
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Also distinguish the system boundary from the PCR. The PCR supplies rules; the system boundary and modules in the individual declaration show which parts of the product life cycle were included. A cradle-to-gate result covers extraction and processing through manufacture, but excludes transport beyond the factory gate and later stages. It is not a whole-life result. USGBC’s EPD guide describes at least cradle-to-gate scope in its LEED credit context; that credit-specific minimum is not a universal definition of what a designer must use.
How should a designer read an EPD?
Read the declaration from identity and rules to results, not from the largest emissions figure backward. This sequence helps reveal whether the document applies to the product being specified and what its reported numbers can support.
- Confirm the product and manufacturer. Identify the declared product, any product range covered, manufacturer and geography or market. Make sure the document applies to the exact product being considered, not merely a similar product from the same manufacturer.
- Find the governing PCR and version. Record the PCR title and version, and check that the applicable rules meet the project’s requirements. If the document relies on a core PCR rather than a stand-alone category PCR, verify that the relevant policy accepts that approach.
- Read the unit carefully. EPD results may be reported per kilogram, square metre or a functional unit. A result on one basis cannot be compared directly with a result on another. Conversion may be possible, but only if the products’ functions and the basis of the conversion are equivalent and clear.
- Identify the system boundary and life-cycle modules. Note which stages are included and which are omitted. A production-stage result does not include use, replacement or end-of-life unless those stages are in the declaration and modeled.
- Review the indicators, not only one headline metric. Global warming potential is one environmental indicator, not a complete environmental profile. Check which categories the EPD reports, and avoid treating a result in one category as a verdict across all impacts.
- Check data and assumptions. Review the data period, assumptions and stated calculation methods. Look for information about data quality, collection and allocation methods, cut-off rules and impact assessment methods when you are considering comparisons.
- Verify status and validity. Find the verification statement, publication status and validity date. Confirm that the declaration remains valid for the intended use and that its PCR and version are accepted by the project.
- Relate the figures to the design. Consider the amount of product required, the function it provides, technical performance, service life and relevant installation, replacement and end-of-life scenarios. An EPD is product-specific disclosure; it does not automatically represent the impact of a finished building assembly.
Keep the declaration with the product and specification records, along with the PCR, unit, scope and validity information that informed the decision. This makes it easier for the project team to understand what the EPD supports if products are substituted or procurement requirements are checked later.
When can you compare two EPDs fairly?
Compare headline results only when the underlying declarations are sufficiently aligned. A shared product-category label or a matching indicator name is not enough to establish a fair comparison.
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Before comparing, check whether the EPDs:
- use the same PCR and version, or rules shown to be fully aligned;
- describe products with equivalent functions, technical performance and intended use;
- use equivalent declared or functional units;
- cover equivalent life-cycle stages and system boundaries;
- apply equivalent data-quality requirements, collection and allocation methods, cut-off rules and impact assessment methods; and
- are both valid at the time of comparison.
The International EPD System’s guidance identifies these kinds of conditions for comparison. If one or more important conditions differ, explain the mismatch and do not name a winner based on the headline figures. The declarations may still be useful for understanding each product on its own, but the values may not support a fair comparative claim. The International EPD System also says EPD content should avoid ratings, value judgments and direct comparisons.
Unit conversion alone does not solve every mismatch. For example, putting results on a common mass basis would not make products comparable if they provide different functions, cover different life-cycle stages, or follow materially different calculation rules. Likewise, matching life-cycle stages does not make unlike functions equivalent. The comparison is only as sound as the alignment behind it.
Where can you find and verify an EPD?
Start with the manufacturer’s product page and the relevant program operator’s EPD library. If a declaration is not readily available, USGBC’s guidance notes that designers can request it from the manufacturer. The International EPD System publishes declarations in its EPD Library as part of its development and publication workflow.
For each document, verify the product identity, applicable market, PCR and version, scope, verification and validity before relying on it in a specification or comparison. A document found online is not automatically suitable for a project: its product coverage or rules may not match the specified item, and its validity may not meet the project’s timing or procurement requirements.
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When the declaration is intended to support a rating-system credit, follow that program’s documentation requirements as well as the EPD’s own scope and rules. A credit requirement such as a minimum cradle-to-gate scope should not be mistaken for evidence that the declaration covers every impact or stage relevant to the design.
How are EPDs developed and published?
The International EPD System describes a workflow in which an applicable, valid PCR is selected, an LCA is conducted, the declaration is prepared and verified, and then it is registered and published in the EPD Library. In its development guidance, the system states: “Your EPD must be verified before publication.” Verification is an important part of the declaration process, but it does not make the product environmentally superior or settle whether two declarations are comparable.
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For designers, understanding this process helps explain why the PCR and verification status belong in the document review. The LCA is prepared under defined category rules; the EPD reports the results and assumptions; and verification checks the declaration before publication under the program’s process. The published document is therefore a structured disclosure, not an independent product award.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should EPDs influence a specification?
Use an EPD as one source of product-specific environmental information, not as a stand-alone specification criterion detached from performance and scope. First determine whether a declaration is required by the project, policy or rating-system pathway. Then confirm that the proposed product is covered and that the required PCR, unit, life-cycle scope and validity are present.
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When evaluating options, make the comparison method explicit. Record the shared basis—such as the accepted PCR, function, unit and modules—and call out any differences. If the declarations are not comparable, report them as separate disclosures rather than implying a ranking from values that do not share a sound basis. The EPA notes that consistent units allow comparison when products use the same PCR; the nearby qualification matters: applicable PCRs or procurement rules may add requirements beyond matching units.
Finally, connect the declaration to the building decision. The quantity specified, the service delivered and the expected use of the product matter to a project-level assessment. A lower impact per declared unit does not necessarily mean a lower total project impact if more material is needed or if the products serve different functions. The EPD helps make impacts more visible; design context determines how that information should be used.
What common EPD mistakes should designers avoid?
- Calling an EPD a green certification. It is a declaration of measured or calculated impacts under stated rules, not a general approval of the product.
- Comparing different units as if they were interchangeable. Normalize only when the products’ functions and conversion basis are genuinely equivalent.
- Assuming cradle-to-gate means whole life cycle. That scope stops at the factory gate and excludes later stages unless separately included.
- Choosing a product from one indicator alone. Review other reported impact categories and the product’s function, performance and relevant life-cycle context.
- Assuming all EPDs in one category are comparable. Check PCR version, methods, product function, unit, boundaries and validity.
- Using an expired or mismatched declaration. Verify that it covers the specified product and market and meets project requirements at the time of use.
- Treating a rating-system rule as universal. Requirements differ across programs, geographies, categories and project policies.
Frequently Asked Questions
Does an EPD prove that a product meets building-code requirements?
No. An EPD reports environmental impacts under stated rules; it is not evidence of code compliance or a substitute for technical documentation. Check the product’s separate code, safety and performance documentation against the project requirements.
Can one EPD cover several products in a manufacturer’s range?
It can cover a declared product range, but the declaration must identify that range clearly. Check that the exact product under consideration is included and that its market and assumptions fall within the declaration’s stated coverage.
Can I use an EPD to calculate a building’s environmental impact?
An EPD can supply product-level information for a project assessment, but it is not by itself a building total. The specified quantity, assembly, installation, use, replacement and end-of-life assumptions must be considered where relevant, and the EPD’s modules must match the assessment scope.
