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This guidance supports LCA for DGNB (DE 2023), which is designed to achieve points for the ENV1.1 criterion of the "DGNB System - New buildings criteria set" (version 2023).
With regard to the ENV1.1 criterion, the DGNB System criteria set for new buildings (version 2023) refers in many places to the calculation rules of the Qualitätssiegel Nachhaltiges Gebäude (QNG).
Covered indicators of the ENV 1.1 criterion include:
Indicator 2.1: Disclosure of life cycle CO2 and energy balances
Indicator 2.2: Accounting scope life cycle: Evaluation of the life cycle CO2 balance of the completed building
Indicator 3.1: Evaluation of the other results of the life cycle assessment
All resources available in the tool meet the DGNB requirements for data quality. In accordance with the DGNB criteria set, the tool enables the use of data that is compatible with EN 15804+A1, generic resources from Ökobaudat and QNG calculation values (see updates from August 2024). The guidance states that for indicator 2.5., EN 15804+A2 data may be used. This data is available in the tool "LCA for DGNB DE 2023, ENV 1.1 credit 2.5 (EN 15804+A2)".
Updates from Release in August 2024
With this update, the “Use of net fresh water” impact category as per the 3rd edition of the criteria set is added to the results. As per the methodology, this impact category is an additional information in the results and does not affect the credit calculation of the indicator 3.1.2. To see the results of “Use of net fresh water” impact category, the project must be resaved.
Additionally, QNG data (Rechenwerte) is now enabled in the tool. With this addition, the result summary now includes a separate row for aggregated A1-C4 impacts of the default building technology value (Sockelbetrag) resources.
These updates are enabled directly to the existing LCA for DGNB DE 2023 tool.
The scope of the DGNB (DE 2023) certification includes the life cycle stages A1-A3, B4, B6 and C3-C4. D1 and D2 are also included but are reported separately.
What is included in the scope?
The included building elements include, among other things, the building parts from Kostengruppen (KG) 300 according to DIN 276 (2018) as well as defined building systems of KG 400. Outdoor components according to KG 500 are only to be taken into account if they are directly connected to the building.
All building materials with a share of more than 1% of the total mass of the building, more than 1% of the primary energy consumption (non-renewable) or more than 1% of GWP100 must be taken into account.
The sum of the neglected building materials must not exceed 5% of the mass of the building, the primary energy consumption (non-renewable) or GWP100.
Small parts processed on-site or in a factory (e.g. nails, dowels, screws) and product-specific small quantities (≤ 1kg) may be neglected.
In order to successfully complete your calculations for the ENV 1.1 criterion in One Click LCA, please follow the workflow below:
Fill in the Building materials question of the design either manually or by importing your data.
Select the 'Kostengruppe' for each material in the drop-down menu. Use the comment field for any additional information you wish to include.Fill in the energy consumption input form with the available values from the calculation value table according to the QNG documentation (see here) and enter the annual consumption based on the energy calculations for your project. Added resources should then be classified based on their use:
B6.1: Operational, regulated energy consumption
B6.2: Operational, unregulated energy consumption of lifts or central systems. Only included for non-residential buildings.
B6.3: User-based energy
For self-generated and self-used energy: B6 emissions are not included in the calculations, as long as the embodied carbon of the system is proportionately considered (e.g. 40% of embodied carbon if 40% of the energy produced is used for the building). Embodied carbon connected to the energy that is fed into the grid is not taken into account. The benefits of the sold energy are represented in D2.
Fill in refrigerants in the Emissions and Removals query. The DGNB specifies that refrigerants do not have to be reported if they are natural refrigerants. If other refrigerants are used, the DGNB refers to the QNG guidance ("3.3 Special calculation rule F gases to the LCA accounting rules of the QNG"). You can read more about QNG calculations with One Click LCA here. Save the inputs and proceed by entering information about your reference building into the ‘Reference values’ question form.
Enter Core reference and Additional reference values based on the building type. The reference values are used to calculate the environmental impacts of your reference building.
For the indicators that are also assessed when doing QNG (2.2.1 and 3.1.1), they differ depending on the building type:
For residential buildings, they are fixed and not project-specific. They correspond with the QNG values for the level QNG-PLUS (read more here). To represent this in the software, use the resource "Reference value for DGNB 2023/QNG, Residential building".
For non-residential buildings, the values consist of a part for the construction (modules A1-A3, B4, C3-C4) and a project-specific, energy-related part. These depend on the building type (LCA classes).
To input the construction-related value, use the respective resources for LCA classes.
To determine the latter aspect, the DGNB criteria set refers to the QNG guidance (learn more about this here).
For indicator 3.1.2, the DGNB guidance features a table with fixed figures for all building types, defining the values for construction (modules A1-A3, B4, C3-C4), electricity, and heat. The software automatically calculates these values after inputting the construction-related part based on the building's LCA class. There is no reference value set by the DGNB criteria set for the freshwater indicator.
Enter the calculation period. As per the QNG guidance, to which the DGNB refers to, this is 50 years for residential and non-residential buildings.
Fill in the ‘Building area’ question form as specified, with the area of your actual building in both Nettoraumfläche (NRF, as specified in DIN 277) and Gross Floor Area (mandatory for results per m2 of GFA, required by the DGNB for the documentation).
Click on Results to see the maximum attainable and gained DGNB points based on your calculation.
The supported indicators of the ENV 1.1 criterion are mentioned in the point tables titled 'Points, DGNB 2023 - Complete calculation method and simplified method'. The maximum available points refer to Indicators 2.2.1, 3.1.1 and 3.1.2 of the ENV 1.1 criterion in DGNB 2023. The points achievable from indicator 3.1.2 are divided between POCP, AP and EP according to the weighing key.
Download your results to Excel by clicking 'More actions' and 'DGNB (DE 2023) – XLSX results report'.
The first table on the results page, the summary of results, is displayed per year and area (in NRF or GFA) of the building. The results per GFA can be found in the corresponding column. In contrast to previous DGNB versions, Module D is not included in the totals.
DGNB points are required to be shown in decimal numbers, which can be adjusted under more actions.
A list of data sources you have used for your LCA will appear at the bottom of the page.