Real-Time LCA implements the Danish building regulation BR18 (Bygningsreglementet) §297–298 climate requirements and the related voluntary frameworks. Five regulatory calculation types are available for Danish projects, alongside Custom and Level(s).
All Danish calculation types use a reference study period of 50 years and report Global Warming Potential (GWP) in kg CO₂-eq per m² GFA per year.
BR18 (2025)
The 2025 ruleset of BR18 §297–298 — the currently effective building regulation for new Danish buildings. Tightens scope versus the 2023 ruleset by adding A4 and A5, and replaces the single limit value with per-building-type thresholds.
- Threshold: per-building-type. See the table below for the full list of limits.
- Installation-emissions threshold: 1.5 kg CO₂-eq / m² / year applied to modules A4 + A5 across all building types.
- Output: BR18 Excel export.
Threshold by building type — BR18 (2025)
Bolig (Housing)
| Building type | Applies to | Threshold (kg CO₂-eq / m² / year) | Installation threshold (A4 + A5) |
|---|
| Fritliggende enfamiliehuse | All sizes | 6.7 | 1.5 |
| Etageboliger | All sizes | 7.5 | 1.5 |
| Række-, kæde- og dobbelthuse | All sizes | 6.7 | 1.5 |
| Sommerhus | ≤ 149 m² total area | 4 | 1.5 |
| Sommerhus | > 149 m² total area | 6.7 | 1.5 |
| Campinghytte | ≤ 149 m² total area | 4 | 1.5 |
| Campinghytte | > 149 m² total area | 6.7 | 1.5 |
| Anden feriebolig | ≤ 149 m² total area | 4 | 1.5 |
| Anden feriebolig | > 149 m² total area | 6.7 | 1.5 |
| Ikke defineret | — | Not yet defined | — |
| Building type | Applies to | Threshold (kg CO₂-eq / m² / year) | Installation threshold (A4 + A5) |
|---|
| Kontor | All sizes | 7.5 | 1.5 |
| Skole / institution | All sizes | 8 | 1.5 |
| Handel | All sizes | 7.5 | 1.5 |
| Lager o. lign. | All sizes | 7.5 | 1.5 |
| Produktion | All sizes | 8 | 1.5 |
| Hotel | All sizes | 8 | 1.5 |
| Øvrigt byggeri | All sizes | 8 | 1.5 |
| Ikke defineret | — | Not yet defined | — |
For Sommerhus, Campinghytte, and Anden feriebolig, the lower threshold applies to projects with a total area of 149 m² or less; larger projects of the same type use the higher threshold. See Assumptions and defaults for where the building type is selected in the project view. Low emission (2025)
The voluntary low-emission class for BR18 (2025). Module set matches BR18 (2025); per-building-type thresholds are tighter and the installation-emissions threshold is reduced.
- Threshold: per-building-type. See the table below.
- Installation-emissions threshold: 1.1 kg CO₂-eq / m² / year applied to modules A4 + A5.
Threshold by building type — Low emission (2025)
Bolig (Housing)
| Building type | Applies to | Threshold (kg CO₂-eq / m² / year) | Installation threshold (A4 + A5) |
|---|
| Fritliggende enfamiliehuse | All sizes | 5.4 | 1.1 |
| Etageboliger | All sizes | 6.1 | 1.1 |
| Række-, kæde- og dobbelthuse | All sizes | 5.4 | 1.1 |
| Sommerhus | ≤ 149 m² total area | 3.2 | 1.1 |
| Sommerhus | > 149 m² total area | 5.4 | 1.1 |
| Campinghytte | ≤ 149 m² total area | 3.2 | 1.1 |
| Campinghytte | > 149 m² total area | 5.4 | 1.1 |
| Anden feriebolig | ≤ 149 m² total area | 3.2 | 1.1 |
| Anden feriebolig | > 149 m² total area | 5.4 | 1.1 |
| Ikke defineret | — | Not yet defined | — |
| Building type | Applies to | Threshold (kg CO₂-eq / m² / year) | Installation threshold (A4 + A5) |
|---|
| Kontor | All sizes | 6.1 | 1.1 |
| Skole / institution | All sizes | 6.4 | 1.1 |
| Handel | All sizes | 6.1 | 1.1 |
| Lager o. lign. | All sizes | 6.1 | 1.1 |
| Produktion | All sizes | 6.4 | 1.1 |
| Hotel | All sizes | 6.4 | 1.1 |
| Øvrigt byggeri | All sizes | 6.4 | 1.1 |
| Ikke defineret | — | Not yet defined | — |
Category structure and the 149 m² size split match BR18 (2025); the difference is the tighter threshold values and the lower installation-emissions threshold (1.1 vs 1.5 kg CO₂-eq / m² / year).
BR18 (2023)
The 2023 ruleset of BR18 §297–298 — the predecessor to BR18 (2025). Applied to new buildings ≥ 1,000 m² gross floor area for the limit-value requirement; documentation was required for all new buildings.
- Threshold: 12 kg CO₂-eq / m² / year (single value, all building types).
- Output: BR18 Excel export.
Low emission (2023)
The voluntary low-emission class for BR18 (2023) — same module set, lower limit value.
- Threshold: 8 kg CO₂-eq / m² / year.
Reduction roadmap
A voluntary ambition track aligned with Denmark’s national climate trajectory. Same modules as BR18 (2023); the threshold sits between the low-emission and target-zero ambitions.
- Threshold: 6.55 kg CO₂-eq / m² / year.
Custom
The user-defined calculation type. Has no fixed reference study period and no fixed module set — you choose which lifecycle modules to include, the indicator, and the unit. Use Custom for company-specific standards, parallel reporting alongside a regulatory submission, or any scenario where none of the pre-configured BR18 variants apply.
Level(s) (full EN 15978 module set, no threshold) is also available for Danish projects and is the recommended starting point for cross-border or whole-life-cycle reporting alongside a BR18 submission.
Reference Service Life
All Danish calculation types use the BR18 lifetime table as the source of reference service life for module B4 replacement. Component-level RSL can be overridden per project — see Assumptions and defaults.
Limitations
- BR18 documentation covers GWP only; other EN 15804+A2 indicators are reported when EPD data is available but not required by the regulation.
- The per-building-type threshold values for BR18 (2025) and Low emission (2025) are maintained in the platform and surfaced on the project’s report; consult the regulator’s published list for the authoritative numbers when an audit-grade reference is needed.
