Life Cycle Assessment for EPDs: What Manufacturers Need to Know

Life Cycle Assessment (LCA) is the scientific methodology that underlies every Environmental Product Declaration. Without a valid LCA study, there can be no EPD. For manufacturers considering EPD certification, understanding what an LCA involves — and what it demands from the business — is the essential first step.

What LCA measures

LCA is a structured technique for quantifying the environmental impacts of a product across its entire life cycle. The methodology is defined by two international standards: ISO 14040 (principles and framework) and ISO 14044 (requirements and guidelines). In construction, EN 15804+A2:2019 applies these principles to define exactly how LCA must be conducted for building product EPDs.

An LCA tracks the flows of energy and materials into and out of a product system — from the extraction of raw materials, through manufacturing, transport, use, and eventual disposal or recovery. Each flow is translated into a set of environmental impact indicators using characterisation factors derived from scientific models. The result is a table of numbers that describes the product’s environmental burden across multiple dimensions — climate change, acidification, resource use, water use, and others.

The system boundary

One of the most important decisions in an LCA study is defining the system boundary — what is included and what is excluded. For a construction product EPD, EN 15804 defines the available modules (A1–A3 for cradle-to-gate, through to C and D for end of life) and specifies which modules must be declared.

At minimum, most construction product EPDs cover modules A1–A3: raw material extraction (A1), transport to the manufacturing facility (A2), and the manufacturing process itself (A3). This „cradle-to-gate” scope is the baseline that allows meaningful product comparisons, because it excludes the variability of transport to site, installation methods, and building-specific use patterns.

More complete EPDs also include modules A4–A5 (transport and installation), C1–C4 (end-of-life scenarios), and Module D (recycling and recovery credits). The applicable product category rule specifies which modules are mandatory and which are optional for each product type.

Data collection: the practical challenge

The most time-consuming part of an LCA study is data collection. The LCA practitioner needs quantified data on every significant material input, energy input, and waste output associated with the product’s manufacture. For a concrete producer, this means data on cement consumption per m³, aggregate quantities and their transport distances, water use, electricity consumption, and any admixtures or additions.

Primary data — data collected directly from the manufacturing facility — is always preferred over generic database values. ECHA regulations and EN 15804 emphasise the use of site-specific or company-specific data for the manufacturing stage (A1–A3), because this is where the manufacturer has direct control and where competitive differentiation is most meaningful.

The LCA practitioner typically works with the manufacturer over several weeks to collect and verify this data. Production records, energy bills, material purchase invoices, and waste management records are all primary sources. The quality of the final EPD depends directly on the quality and completeness of this data.

The role of the LCA practitioner

LCA studies for EPDs must be conducted by a qualified LCA practitioner with knowledge of the applicable product category rules and background database systems (most commonly ecoinvent or the European Platform on LCA’s ELCD data). In Poland, most LCA studies for EPD Polska are prepared by consultants with academic or professional LCA backgrounds.

The LCA practitioner translates the manufacturer’s production data into a model, selects appropriate background data for upstream processes (raw material production, energy supply), calculates the impact scores, and prepares the EPD document. The typical timeline from the start of data collection to submission for verification is four to twelve weeks, depending on the complexity of the product and the completeness of available data.

Critical review and verification

Before an EPD can be registered, both the LCA study and the EPD document must be independently reviewed. EN 15804 requires a critical review by a panel or a sole reviewer who is independent of the LCA practitioner and the manufacturer. The reviewer checks that the study was conducted in accordance with ISO 14044, that the system boundary and data quality are appropriate, and that the environmental data has been correctly calculated and reported.

Verification for EPD Polska is carried out by independent verifiers accredited by the programme. The verification process typically takes two to four weeks and may require clarifications or revisions from the LCA practitioner before the EPD is approved for registration.

How long an LCA study remains valid

EPDs are valid for five years. The underlying LCA study should be updated whenever there are significant changes to the product or manufacturing process — a change of raw material suppliers, a major process modification, or a change in the energy mix. Even without changes, the study should be reviewed at renewal to confirm that background data (from ecoinvent or other databases) and product category rules are still current.