LCA vs EPD vs Product Carbon Footprint, Which One Do You Need

Buyers ask suppliers for "an LCA", "an EPD" or "a product carbon footprint" as if the terms were interchangeable. They are related but not the same, and choosing the wrong one can cost months and money. This article compares the three, shows how they connect and helps you decide which one your customer actually needs.

LCA, EPD and product carbon footprint in short

A life cycle assessment (LCA) is the method, a study of a product's environmental impacts across its life cycle under ISO 14040 and ISO 14044. An EPD is a verified, published summary of an LCA made to product category rules under ISO 14025. A product carbon footprint (PCF) is a study limited to greenhouse gas emissions, usually to ISO 14067.

Put simply, every EPD and every PCF rests on life cycle thinking, but they differ in what they report, who checks them and what they can be used for.

LCA vs EPD vs product carbon footprint compared

Life cycle assessment

An LCA is the most flexible of the three. You define the question, the functional unit, the system boundary and the impact categories, and ISO 14044 sets the method and reporting requirements. That flexibility is its strength for internal work, such as comparing two designs or finding the input that drives a product's footprint.

It is also its weakness for communication. Two LCAs of similar products can use different boundaries, data and methods, so their results are rarely comparable. If you want to claim publicly that your product is better than another, ISO 14044 requires a critical review by a panel of interested parties, and weighting cannot be used for that comparison.

Environmental product declaration

An EPD fixes the rules so that results become comparable within a product category. The PCR sets the declared unit, boundary, allocation, data quality and indicators, the verifier checks compliance, and the programme operator publishes the result. For construction products, EN 15804+A2 requires modules A1-A3, C1-C4 and D for nearly all products and reports 13 core indicators.

The cost is less freedom and more time. You cannot choose a flattering boundary, and verification adds weeks. In exchange you get a document that EU specifiers, building LCA tools and rating systems accept, and which prepares you for the GWP declaration under the Construction Products Regulation (EU) 2024/3110.

Product carbon footprint

A product carbon footprint reports only greenhouse gas emissions and removals, expressed in kg CO₂ equivalent per unit. ISO 14067 is the international standard, and the GHG Protocol Product Standard is widely used in corporate supply chains. Both require the same life cycle approach as an LCA, but with a single impact category.

PCFs are what most non-construction buyers want, because they feed directly into Scope 3 inventories and supplier engagement programmes. They are faster to produce than an EPD and can be cradle-to-gate, which is usually what a buyer needs for purchased goods. For the differences between the two main PCF methods, see our article on ISO 14067 vs the GHG Protocol Product Standard.

How the three relate

An EPD is built on an LCA, and a PCF is a carbon-only LCA. In practice, one well-scoped study can produce all three outputs from the same inventory. The figures will not always match, though, and buyers notice when they do not.

• EN 15804+A2 reports GWP-total, which includes biogenic carbon, alongside GWP-fossil, GWP-biogenic and GWP-luluc. A PCF to ISO 14067 reports fossil and biogenic emissions and removals separately and treats some items differently.
• Allocation rules can differ between the PCR and the PCF guidance used by your buyer.
• An EPD often declares end of life and module D, while a cradle-to-gate PCF stops at the factory gate.
• The International EPD System also reports GWP-GHG, an indicator designed to be closer to a carbon footprint figure, which helps when one buyer asks for both documents.

When we produce both, we include a short reconciliation explaining each difference, so procurement teams do not treat a mismatch as an error.

Which one do you need

If the request is vague, ask the buyer what the data will be used for and which standard their tool accepts. A building LCA tool will want an EN 15804+A2 EPD. A procurement team building a Scope 3 inventory will be happy with a verified ISO 14067 footprint.

What common buyer requests usually mean

Requests rarely name a standard. These are the ones we see most often from customers of Turkish manufacturers, and what they normally turn out to mean once the buyer's team is asked.

• "Please send your EPD" from an architect, contractor or façade consultant. A verified EN 15804+A2 EPD with a registration number, for use in a whole-building LCA or a LEED or BREEAM submission.
• "What is the carbon footprint per kg" from an automotive, electronics or retail buyer. A cradle-to-gate PCF to ISO 14067 or the GHG Protocol Product Standard, often entered into the buyer's supplier portal.
• "Do you have an LCA" from a large industrial customer. Often a PCF in disguise. Sometimes a request for an ISO 14044 study covering several impacts, if the buyer runs its own ecodesign or PEF work.
• "We need your emissions data" from an EU importer of steel, aluminium or cement. Usually CBAM embedded emissions, which follow their own rules and are not interchangeable with an EPD or PCF figure.

Asking one clarifying question before starting work saves the most common mistake, which is producing a verified EPD when the buyer only needed a carbon figure, or the reverse.

Where PEF fits

The EU Product Environmental Footprint (PEF) method, set out in Commission Recommendation (EU) 2021/2279, is a fourth option that sits between an LCA and an EPD. It uses 16 impact categories and product-specific category rules (PEFCRs), and unlike EN 15804 it allows normalisation and weighting into a single score. PEF is not mandatory in itself, but its method underpins EN 15804+A2 and is expected to inform product rules under the Ecodesign for Sustainable Products Regulation (EU) 2024/1781, where environmental footprint information may be required in a digital product passport. No ESPR product-group delegated act had been adopted at the time of writing.

Can one project deliver all three

Yes, and it is usually the most efficient route for manufacturers with mixed customer bases. The data collection at the plant is the same, and it accounts for most of the effort. We set the goal and scope so the inventory meets ISO 14044, the relevant PCR and ISO 14067 at once, then produce the outputs in the order your customers need them.

See our life cycle assessment services for the study itself, product carbon footprint to ISO 14067 for carbon-only requests, and EPD consultancy when you need a verified, published declaration.