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Real-Time LCA implements TEK17 — the Norwegian building regulation Forskrift om tekniske krav til byggverk — as the primary regulatory calculation type for Norwegian projects. Calculation rules follow NS 3720:2018 (the Norwegian method for greenhouse-gas calculations for buildings, available from Standard Norge), which conforms to EN 15978.

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TEK17

  • Reference study period: 50 years.
  • Indicator: GWP-IOBC (GWP including biogenic carbon — the indicator name used by the Norwegian method), reported in kg CO₂-eq per m² per year.
  • Threshold: none defined in Real-Time LCA at this time.
The TEK17 module set differs from BR18 — B2 (maintenance) is included, and end-of-life modules C1–C4 are not part of the default scope. This matches the scope defined by NS 3720 for buildings under TEK17.

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Custom and Level(s)

Real-Time LCA additionally exposes Custom (user-defined scope, GWP-IOBC in kg CO₂-eq / m²) and Level(s) (full EN 15978 module set with standard GWP — see Level(s)) for Norwegian projects. For projects targeting BREEAM-NOR Mat 01, the Custom or Level(s) calculation type is typically the appropriate base — see Certification schemes.

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Reference Service Life

The TEK17 calculation uses Norwegian lifetime tables (NS 3720 reference values) for module B4 replacement. Component-level RSL can be overridden per project.

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Limitations

  • The indicator naming GWP-IOBC differs from the standard EN 15804+A2 GWP-total / GWP-fossil / GWP-biogenic split. Where a project also runs a Level(s) calculation in parallel, the two GWP values are not directly comparable — Level(s) uses standard EN 15804+A2 GWP.
  • End-of-life modules (C1–C4) are not in TEK17 scope. To document end-of-life impacts alongside TEK17, run a Level(s) calculation in parallel.
  • No regulatory limit value is configured for TEK17 in Real-Time LCA. The result is reported numerically; a project’s compliance against any specific Norwegian limit value is determined outside the calculation type itself.