Carbon Footprint vs Environmental Product Declaration — What the Difference Is and When a Customer Requires an EPD Instead of a PCF

A customer sends a request. They want environmental data for your product. You send them your Product Carbon Footprint report. They come back and say it is not what they need — they need an EPD.

That exchange happens more often than it should. A PCF and an EPD are both outputs of environmental analysis. Both involve lifecycle thinking. Both quantify emissions. But they are different documents, produced through different processes, governed by different standards, used in different contexts, and accepted by different audiences. Sending one when the other is required does not just waste time — it can delay a procurement approval, fail a tender, or hold up a building certification.

This blog explains what each document actually is, how it is produced, what it does and does not cover, and — most usefully — the specific situations where a customer requires an EPD and a PCF will not substitute for it.

A Product Carbon Footprint is a calculated figure. It quantifies the total greenhouse gas emissions associated with a product across all or part of its lifecycle, expressed in kilograms of carbon dioxide equivalent per defined unit of product.

A PCF measures the total GHG emissions associated with a product's life cycle, including stages such as raw material extraction, waste management, energy use, and transportation. It is expressed in terms of CO₂ equivalent and guided by standards such as ISO 14040, ISO 14044, and ISO 14067.

A PCF is a number with a methodology behind it. The output is typically a report or data file containing the calculated figure, the system boundary (cradle-to-gate or cradle-to-grave), the functional unit, the data sources and emission factors used, and the methodological decisions made during the study. It does not have to be registered anywhere. It does not have to be verified by a third party, although third-party verification is possible and increasingly required by customers. It does not follow a prescribed format that makes it directly comparable to a PCF from a different manufacturer for a similar product.

The main standards governing PCF calculation are ISO 14067:2018, which sets requirements and guidelines for quantification, and the GHG Protocol Product Standard, which provides detailed calculation guidance. Both are voluntary standards — there is no mandatory global requirement to calculate a PCF, though CSRD, CBAM, and an increasing number of procurement requirements are making it effectively obligatory for certain manufacturers in certain markets.

A PCF is fast to produce relative to an EPD. It can be calculated using bill of materials data, emission factor databases, and a defined methodology without engaging an external programme operator or undergoing formal registration. Its primary uses are: supplying Scope 3 Category 1 data to customers completing their own GHG inventory, supporting CBAM declarations for exports into the EU, satisfying customer-specific carbon data requests in supply chain questionnaires, and informing internal emissions reduction decisions.

An Environmental Product Declaration is a registered, publicly accessible document. It is not simply a calculation or a report — it is a formal declaration of a product's environmental performance, produced through a structured process, verified by an independent third party, and published in a recognised EPD database by an accredited programme operator.

An EPD is a standardised document that provides third-party verified, transparent information about the environmental impact of a product throughout its lifecycle. EPDs deliver standardised, third-party verified documentation that tracks multiple environmental impacts — including energy use, water consumption, resource depletion, and greenhouse gas emissions — across multiple impact categories. A PCF assessment focuses only on greenhouse gas emissions and measures them as carbon dioxide equivalents.

That scope difference is the first fundamental distinction. A PCF covers one environmental impact category — greenhouse gas emissions, expressed as CO₂e. An EPD covers multiple environmental impact categories simultaneously. Construction product EPDs report on multiple different environmental metrics including global warming potential, ozone depletion, acidification, eutrophication, photochemical ozone creation, and resource depletion, among others. Global warming potential — the climate change indicator — is one line in an EPD. A PCF is only that line, in more detail.

The governing standard for EPDs is ISO 14025, which defines Type III environmental declarations — declarations that provide quantified environmental data using predetermined parameters and verified by a third party. ISO 14025 establishes the procedure for developing Product Category Rules and the required content of a PCR, as well as requirements for comparability. For construction products specifically, EN 15804 provides the core rules that an EPD must follow.

Understanding how an EPD is produced is essential for understanding why it is a different output from a PCF and why it takes longer, costs more, and carries a different type of authority.

This is the question that matters most operationally. A PCF satisfies many customer carbon data requests — but it does not satisfy all of them. These are the contexts where an EPD is specifically required and a PCF will not substitute.

This is the most common and most established context where EPDs are required, not PCFs. Green building schemes such as LEED, BREEAM, and DGNB require or incentivise EPDs. LEED by the US Green Building Council is one of the building assessment schemes that has given significant credit to projects where EPDs are available, encouraging the sourcing of low-carbon products with verified life-cycle information. BREEAM has several national implementations where requirements differ, but in most cases only pre-approved national databases of LCA information are accepted. A manufacturer of steel, concrete, insulation, cladding, flooring, glass, or any material that enters a building project pursuing LEED or BREEAM certification will need an EPD — not a PCF — to contribute to the relevant materials credits. Providing a PCF in this context will not earn the certification credit.

Public procurement bodies across the EU and EEA increasingly require EPDs to assess the environmental footprint of products in construction and infrastructure projects. In the United States, the Buy Clean California Act requires EPDs for four eligible material categories used in state-funded public works projects: structural steel, concrete reinforcing steel, flat glass, and insulation. The Federal Sustainability Plan encourages federal agencies to prioritise low-carbon materials supported by EPDs. For manufacturers selling into government-funded infrastructure, construction, or materials projects, EPD registration is increasingly a prerequisite for participation — not a differentiator.

The EU Empowering Consumers for the Green Transition Directive (ECGT), which became enforceable from 27 September 2026, prohibits generic environmental claims — such as "eco-friendly," "green," or "sustainable" — unless they are clearly substantiated with verifiable evidence. The EU Green Claims Directive, which would have added a separate harmonised pre-market verification layer, has been effectively suspended: the European Commission announced its intention to withdraw the proposal in June 2025, and the legislative process has been paused with no formal reinstatement as of the time of writing. However, this does not reduce compliance pressure — the ECGT is fully in force and provides national authorities with strong enforcement powers against unsubstantiated environmental claims. EPDs represent the most tested and defensible route to substantiating product-level environmental claims, because they are based on standardised methodology, third-party verified, and registered in a recognised database. A manufacturer making public carbon claims that rests on an internal PCF report without third-party verification faces increasing legal exposure as ECGT enforcement intensifies.

An increasing number of EU member states are mandating building-level LCAs for new construction and major refurbishment projects — a requirement that demands product-level environmental data from every material used. EPDs provide the product-specific environmental performance data needed as inputs to a whole-building LCA. A PCF provides only the global warming potential indicator; a building-level LCA requires all the additional environmental indicators that an EPD reports and a PCF does not.

While the automotive sector more commonly requests PCFs for carbon reporting, some original equipment manufacturers and tier-1 suppliers are beginning to require EPDs for specific material categories — particularly steel and aluminium — as they implement whole-vehicle lifecycle reporting and prepare for upcoming Digital Product Passport requirements. If a customer's procurement specification or supplier questionnaire explicitly references ISO 14025 or asks for a "Type III environmental declaration," they are asking for an EPD.

The fastest way to resolve the ambiguity when a customer asks for "environmental data" or "sustainability data" without specifying: ask whether they need it for a GHG inventory or Scope 3 calculation (PCF), or for a procurement tender, building certification, or public environmental claim (EPD). Those two questions will resolve the vast majority of cases.

An important practical point: a PCF is not a competing alternative to an EPD. In most cases, the PCF calculation is part of the work required to produce an EPD.

A PCF focuses specifically on the carbon emissions associated with a product. It is often a subset of an LCA. An EPD is a verified, registered declaration that reports the full results of your LCA for public-facing disclosure. It adheres to Product Category Rules, which ensure consistent and comparable LCA methodology for specific product categories.

The LCA that underlies an EPD includes the calculation of global warming potential — which is the same indicator a PCF calculates. A manufacturer who has already produced a rigorous, ISO 14067-aligned PCF with complete lifecycle data has done most of the analytical work required to produce an EPD. The additional steps are expanding the LCA to cover all the other environmental indicators the PCR requires, engaging a programme operator, undergoing third-party verification, and completing the registration and publication process.

This means the question of PCF versus EPD is often not a choice between two separate workstreams — it is a question of scope and registration. Starting with a well-structured PCF, then expanding to a full LCA and completing the EPD registration process, is the most efficient path for manufacturers who need both outputs for different customers or contexts.

The reverse does not always hold: an EPD does not replace a PCF for all purposes. CBAM, for example, requires embedded emissions data in a specific format that an EPD does not produce directly. PACT-formatted supply chain data exchange requires a PCF in the Pathfinder data model, not an EPD. For those contexts, the PCF calculation derived from the EPD's underlying LCA data must be extracted and presented in the appropriate format.

Before beginning either a PCF or an EPD, answer these questions in sequence.

A PCF is a calculated figure measuring greenhouse gas emissions across a product's lifecycle. An EPD is a registered, verified, publicly available document declaring a product's full environmental performance across multiple impact categories. They are not interchangeable, and they are not in competition — they serve different markets, different regulatory requirements, and different customer needs.

The biggest decider on whether a manufacturer needs an EPD often comes down to industry and the regulations within that industry. Manufacturers supplying the construction sector need EPDs. Manufacturers supplying industrial customers for Scope 3 reporting need PCFs. Many manufacturers need both, for different customers and different contexts simultaneously.

The mistake to avoid is assuming that producing one satisfies the requirement for the other. Ask what the output will be used for before calculating anything. The answer determines which process you start, which standards govern the work, and what the final deliverable looks like. Getting that clarity at the beginning is the difference between a submission that is accepted and one that comes back with a request for something different.