ISO 21930 vs EN 15804: Which EPD Standard Governs Your Construction Project? (2026)

ISO 21930:2017 and EN 15804+A2:2019 are the two standards governing Environmental Product Declarations for construction products. ISO 21930 is the international version; EN 15804+A2 is the European standard with a larger mandatory indicator set. LEED v4 accepts either. DGNB and BREEAM require EN 15804+A2. Geography and certification programme determine which applies.

Key numbers at a glance

What is the difference between ISO 21930 and EN 15804?

ISO 21930:2017 is the international core rules standard for Environmental Product Declarations (EPDs) of construction products and services. ISO 21930 establishes the methodology (lifecycle module map, verification rules, and programme operator requirements) that EPD programme operators worldwide use. ISO 21930 subordinates to ISO 14025, the umbrella Type III environmental declaration standard covering all industries.

EN 15804+A2:2019 is the European equivalent, published by the European Committee for Standardization (CEN). EN 15804 is a superset: every EPD that complies with EN 15804+A2 automatically complies with ISO 21930. The reverse is not true. EN 15804+A2 mandates a larger set of environmental indicators, including split GWP categories (GWP-fossil, GWP-biogenic, GWP-luluc), water deprivation potential (WDP), and particulate matter (PM). ISO 21930 leaves those additional indicators to programme discretion.

Both standards use the same lifecycle module map: A1-A3 (product stage), A4-A5 (construction), B1-B7 (use), C1-C4 (end of life), and Module D (benefits beyond the system boundary). The structure is identical. The indicator requirements differ.

Which EPD standard applies in which country?

DataDrivenAEC’s analysis of 7 regions confirms that project location determines the applicable EPD standard, not architect preference.

For a US architect specifying to LEED v4 MR Credit Building Product Disclosure and Optimization, any EPD issued under EN 15804+A2 or ISO 21930 satisfies the requirement. The critical check is that the EPD is Type III (ISO 14025 verified) and covers the applicable product category. National programme membership and the ECO Platform mark are not required for LEED v4 submissions.

Why does LEED v4 accept both ISO 21930 and EN 15804?

LEED v4 BD+C MR Credit Building Product Disclosure and Optimization explicitly accepts EPDs that comply with “ISO 14025 and EN 15804 or ISO 21930.” This language reflects the state of the global EPD ecosystem at LEED v4’s release: the US market was primarily served by EPD International (using ISO 21930), while European markets had converged on EN 15804.

For US projects, the practical effect is that European manufacturer EPDs (EN 15804+A2) and US or global EPDs (ISO 21930 via EPD International) both qualify for the same LEED v4 submittal. An architect sourcing concrete from a German supplier and insulation from a US manufacturer can submit both EPDs without conversion or adjustment.

DGNB and BREEAM do not carry the same dual-acceptance language. DGNB certification requires Okobaudat-aligned EPDs under EN 15804+A2. BREEAM Mat 01 requires EN 15804-compliant EPDs. For EU-certification projects, an ISO 21930-only EPD from a non-European manufacturer may be insufficient for these programmes.

What lifecycle modules does ISO 21930 require?

ISO 21930:2017 organizes construction product environmental impacts across five lifecycle stages, the same module map used in EN 15804 and EN 15978 for building-level LCA:

• A1-A3 (Product stage): Raw material extraction (A1), transport to manufacturing plant (A2), and manufacturing (A3). These cradle-to-gate modules are mandatory in all ISO 21930-compliant EPDs.
• A4-A5 (Construction process): Transport to site (A4) and installation into the building (A5). Declared where data is available.
• B1-B7 (Use stage): Use, maintenance, repair, replacement, refurbishment, operational energy, and operational water use across the reference building service life.
• C1-C4 (End of life): Deconstruction, transport, waste processing, and disposal.
• Module D: Benefits from reuse, recovery, and recycling potential beyond the system boundary. Declared separately and not included in lifecycle totals.

ISO 21930 sets minimum indicator requirements per module. EN 15804+A2 expands the mandatory indicators for the same modules, particularly the GWP split and WDP additions, without changing the module structure itself.

Common mistakes when specifying EPD standards

1. Assuming all Type III EPDs carry equivalent indicators. A Type III EPD verified under ISO 21930 may report fewer environmental indicators than an EN 15804+A2 EPD. For DGNB or BREEAM projects, an ISO 21930-only EPD from a non-EU manufacturer may be insufficient. Confirm the certification programme’s EPD version requirements before the specification phase.

2. Mixing EPD standards without verifying each document. LEED v4 accepts both ISO 21930 and EN 15804. Each individual EPD must satisfy one standard on its own terms. An EPD that satisfies neither is ineligible, regardless of manufacturer sustainability claims. Check each EPD’s verification statement, not just the manufacturer’s data sheet.

3. Ignoring the GWP split requirement. EN 15804+A2 requires GWP to be reported as three separate values: fossil, biogenic, and land-use/land-use change (luluc). ISO 21930 does not mandate the split. An EN 15804+A2 EPD and an ISO 21930 EPD with a single GWP figure are not directly comparable on that indicator. Verify alignment before cross-standard comparisons.

4. Treating ISO 21930 as obsolete. ISO 21930:2017 is active. For non-EU markets (including the US, Australia, Singapore, and Japan), ISO 21930 remains the primary international reference for EPD programme operators. EPD International (EnvironDec), the largest global EPD programme, publishes under ISO 21930.

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Frequently asked questions

What is ISO 21930 in construction?

ISO 21930:2017 is the international core rules standard for Environmental Product Declarations (EPDs) of construction products and services. ISO 21930 provides the methodological framework (module map, verification rules, programme operator requirements) that EPD programme operators worldwide use, including EPD International (EnvironDec). For EU projects, EN 15804+A2:2019 is the more demanding superset. For LEED v4 projects, ISO 21930 is explicitly accepted alongside EN 15804.

Does EN 15804+A2 supersede ISO 21930?

EN 15804+A2 is a superset of ISO 21930, not a replacement. Every EPD complying with EN 15804+A2 automatically complies with ISO 21930. EN 15804+A2 mandates additional indicators (the GWP-fossil/biogenic/luluc split, water deprivation potential WDP, and particulate matter PM) that ISO 21930 leaves to programme discretion. ISO 21930:2017 remains the active international standard for non-EU markets.

Which EPD programme uses ISO 21930?

EPD International (EnvironDec) publishes EPDs under ISO 21930 and is the largest global EPD programme. The ECO Platform network of European programme operators, including IBU (Germany), INIES (France), BRE (UK), and EPD Norway, aligns with EN 15804+A2. For US, Australian, or Singaporean construction products, EPD International-issued EPDs are typically ISO 21930-compliant.

What lifecycle modules does ISO 21930 cover?

ISO 21930:2017 covers the same module map as EN 15804: A1-A3 (product stage), A4-A5 (construction process), B1-B7 (use stage), C1-C4 (end of life), and Module D (benefits beyond the system boundary). A1-A3 is the minimum required for EPD publication. EN 15804+A2 applies the same module map with a larger mandatory indicator set.

Can ISO 21930 EPDs be used for DGNB certification?

DGNB certification requires Okobaudat-aligned EPDs, which conform to EN 15804+A2. An ISO 21930-only EPD from a manufacturer outside the ECO Platform network may not satisfy DGNB’s indicator requirements, particularly the split GWP values and WDP. Verify that any EPD used in a DGNB submittal carries EN 15804+A2 compliance before including it in the certification documentation.