Shared scope
- Reference study period: 50 years.
- Indicator: Global Warming Potential (GWP), kg CO₂-eq per m² GFA per year.
QNG (base tier)
The entry tier of the QNG label.- Threshold: none configured in Real-Time LCA. Achieving the base QNG label requires meeting the broader QNG criteria framework outside the GWP-only check; this calculation type produces the numeric input to that broader assessment.
QNG-PLUS
The intermediate tier — the same module scope with a regulator-defined limit value.- Threshold: 24 kg CO₂-eq / m² / year.
QNG-PREMIUM
The top tier — the same module scope with the tightest limit value.- Threshold: 20 kg CO₂-eq / m² / year.
Custom and Level(s)
Real-Time LCA additionally exposes Custom and Level(s) (full EN 15978 module set, see Level(s)) for German projects. Projects targeting DGNB certification typically use Custom or Level(s) — see Certification schemes for DGNB scheme details.Datasource
Most German projects rely on OEKOBAUDAT as the primary generic-data source, complemented by IBU (Institut Bauen und Umwelt) verified EPDs. See EN 15804+A2 for details on datasource handling.Reference Service Life
QNG calculations use German lifetime references for module B4 replacement, with project-level overrides available — see Assumptions and defaults.Limitations
- The QNG label has criteria beyond GWP — circularity, healthy materials, sustainable construction-site practice, and others. The QNG calculation type in Real-Time LCA addresses the building-level GWP component only; the rest of the QNG criteria are assessed outside the calculation type.
- Output-format details for QNG submission are tracked separately.