The required level of data detail in a Life Cycle Assessment (LCA) depends on the study’s scope,objective, and framework. Internal studies for eco-design can rely on simplified data, while verified Environmental Product Declarations (EPDs) or ISO-compliant LCAs require high data quality, transparency, and completeness according to the relevant standards.
Summary
Start from available data — site totals, supplier data, component lists.
Refine over time — move toward process-level, raw-material-level, and transport-specific data.
Be transparent — document every assumption, gap, and estimation.
Align with the framework — simplified for internal use, strict for ISO/EPD publications.
Granularity should always match the study’s ambition: broad approximations are acceptable for scoping and design support, while formal declarations require fully traceable, verifiable data across all life-cycle stages.
For more details, please read the article below.
1. Granularity Depends on the Scope and Framework
The starting point is the system boundary — whether the study is cradle-to-gate, cradle-to-grave, or another configuration.
Simplified internal LCA (eco-design use): flexible approach; level of detail driven by data availability and study goals.
ISO-compliant LCA (ISO 14040/14044): requires traceability of all significant energy and material flows and transparent documentation of assumptions.
EPD (Environmental Product Declaration): governed by the product’s PCR (Product Category Rules) ** and by EN 15804/A2** in the construction sector, which prescribe mandatory indicators and data quality rules.
2. Data Granularity by LCA Stage
LCA Stage
Preferred Data Detail
If Missing
Minimum Mandatory Data
Goal & Scope
Clear definition of system boundaries, functional unit, and included life-cycle modules
Adjust scope to align with available data
Functional unit, boundaries, declared exclusions
Raw Materials
Material-level composition (mass or % per material)
Use manufactured component list or supplier emission factors
Main materials or components covering >90% of product mass
Manufacturing
Energy and inputs per process or machine
Use annual site totals and allocate by product volume or weight
Total site energy use, allocation rule, key inputs
Transport (Inbound/Outbound)
Factory of origin and destination for each product, distances per mode (truck, ship, air)
Use average distance weighted by shipment volumes
Origin/destination (or average), transport mode, estimated distance
Use Phase
Real use conditions, energy, maintenance data
Apply default or sector averages
Usage scenario or representative assumption
End-of-Life
Recycling rates, treatment routes, transport to end-of-life
Use default sector values
Main disposal/recycling assumptions
Impact Assessment
Full characterization of all flows per ISO or PCR
Apply standard methods for global warming, energy, waste
At least mandatory impact indicators (e.g. GWP, energy use)
Interpretation
Sensitivity and uncertainty analysis
Transparent discussion of missing data
Explanation of gaps and expected influence
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3. If You Can’t Provide Certain Data
Missing data must never be ignored silently. ISO 14044 requires that each missing or estimated value be:
Explicitly identified and justified;
Replaced by data from similar processes or secondary databases when possible;
Evaluated for completeness, typically aiming to cover 90–95 % of all relevant flows.
When no reliable data exist, adjust the study boundary or clearly label the gap as an exclusion. Always describe the potential effect of that exclusion on overall results.
4. Data Quality and Documentation Requirements
According to ISO 14044, all datasets must specify:
Temporal, geographical, and technological representativeness;
Source, precision, completeness, and uncertainty;
Consistency and reproducibility of data collection.
For EPDs (EN 15804/A2):Data must meet the quality rules defined in the relevant PCR;
Each module (A1–A3, A4–A5, etc.) has mandatory reporting requirements;
Minimum indicators include energy use, GWP, water use, and waste categories.