The Klimatdeklaration tool (Included in all Swedish licenses) is used to calculate global warming potential impacts from the construction phase of a building. The results of your calculations with this tool can be used for the law on climate declaration (Klimatdeklaration) for new buildings in Sweden, enforced at the beginning of the year 2022.

For those interested in more background on Klimatdeklaration, One Click LCA has also created a One Click LCA Academy course on the topic.

'Klimatdeklaration av byggnader' is the latest version of the tool

A new version of the Klimatdeklaration tool was published in the March 2024 release, called 'Klimatdeklaration av byggnader - IOBC'. In February 2025, this tool was renamed to 'Klimatdeklaration av byggnader'. This tool prioritizes GWP-GHG (also called GWP-IOBC) values of EPDs where this value is declared (mainly in EPDs published in EPD Hub, EPD Norge & International EPD System). IOBC stands for 'instant oxidation of biogenic carbon'. As per the description on the Boverket website:

GWP-GHG (or GWP-IOBC) is the key indicator for climate declarations of buildings. It reflects the climate impact of fossil fuel greenhouse gas emissions. GWP total includes additional factors beyond GWP-GHG and is not suitable for this purpose.
For climate declarations: Use GWP-GHG from life cycle phases A1-A3, reported in kilograms of carbon dioxide equivalents per life cycle module and declared unit.
If an Environmental Product Declaration (EPD) lacks GWP-GHG: Recalculate it from the GWP total by removing the impact of biogenic carbon dioxide.

For the last point, in EPDs where neither of these GWP values are declared, the tool uses GWP-fossil and GWP-LULUC values as required in the scheme.

This new tool also makes it easier to assess the environmental impact of your construction materials by allowing you to choose between entering materials 'as-built' or 'as-bought'. The latter allows you to use the actual amount of material brought to the site (including site wastage) for more accurate calculations. You can input data from your cost plans or BIM models, with flexible options for calculating wastage emissions (A5).

The tool supports both XLSX and XML exports for easy sharing and analysis. The XLSX file presents calculation results in the format of Boverket’s template “Mall för beräkningsunderlag” and the XML file can be used to import the results to Boverket’s hand-in page for climate declarations.

Life cycle scope

The life cycle stages included in climate declaration are manufacturing of materials (A1-A3), transportation of materials from manufacturing site to the construction site (A4) and construction process (A5).

Building part scope

Materials included in the scope:

Load-bearing structural parts - Foundation
Load-bearing structural parts - Other, such as the frame, load-bearing walls, columns, beams and joists.
Building envelope, elements that consist of one or more layers isolating the interior of a building from outdoors.
Interior walls, also walls that are not load-bearing.

Materials excluded:

Earthworks, piling, installations and fixed furnishing
Internal surface layers of envelope, load-bearing structural parts or interior walls

More detailed information on which building parts that are included in the scope or not within the categories above can be found in this guidance by Boverket.

Climate data scope

The tool in One Click LCA is customised to only show data that is allowed to be used. There are two main types of data allowed in Klimatdeklaration:

Generic data from the Boverket database
Third-party verified Environmental Product Declarations (EPDs)

Generic data from other sources than Boverket is not allowed. When reporting the results to Boverket, a 25 % conservative top-up factor on the GWP should be applied to Boverket data (but not to EPDs). One Click LCA automatically includes the conservative factor for Boverket data. On the result page, both results including the conservative factor (conservative values) and without the factor (typical values) are presented.

In the tool, both EPDs according to EN 15804+A1 and EN 15804+A2 can be found.

Create a project and select the right calculation tool

Create a building project and select the and select the 'Klimatdeklaration av byggnader' tool as the chosen calculation tool. This is the latest version of the tool.

Create your first design and set up the LCA parameters if needed

Create your first design.

NOTE: LCA parameters do not affect the Klimatdeklaration tool at all, the parameters built into the tool are already customised according to the Klimatdeklaration requirements. For instance, wastage percentages and transportation distances are based on values from Boverket.

If you are using additional tools aside Klimatdeklaration in your project, set the LCA parameters accordingly.

If you use only Klimatdeklaration tool in your project you can choose 'Use default LCA parameters' to skip this phase.

Check mandatory scope

Check the mandatory scope of required elements from the Boverket guidance.

Fill in the building area

Fill in the Building area question form by entering the Bruttoareal (BTA), Sweden of the building.

Input required material data

Fill in your project information in One Click LCA by entering the design either manually or by importing your data (see different import options here; guidance for data import can be found here). If you need help finding the right datasets for your building materials, check our guidance pages here and here.

Use EPD data where available. If there is no EPD published from the specific product, choose a generic material from the Boverket database instead. Default transportation and material wastage are automatically added for both Boverket and EPD material data. These defaults are based on values from Boverket for the respective type of material. However, more accurate project-specific values can be added and data source changed to 'Specifika Klimatdata'.

After importing or manually adding the material data, set the following parameters for each material in the 'Building Materials' query:

Choose the correct building part classification for each material from the 'BSAB Byggdelar' dropdown menu. This can be done also within the import process. This parameter is used for showing the results per building part in the result graphics.
Specify the correct Boverket building part from the 'Byggnadsdel' dropdown menu. The chosen option will determine which of the four Boverket building part categories the results of each material row will be included in. In Klimatdeklaration, this classification system is used when reporting the results so the user should check that these are correctly assigned.
Check the box 'Bought amount' if the quantity of the material includes site wastage. If the box is not checked, the calculation will consider the quantity of material to be the 'as-built' quantity. If the material is as-bought, the wastage calculated based on the wastage factor, will be deducted from the entered quantity and allocated to A5. If the material is as-built, the wastage calculated based on the wastage factor, will be added in addition to the entered quantity and allocated to A5.
Set the transportation distance and method from the manufacturing site to the construction site of each material. Adjust the data source if needed. Default values are based on data in the Boverket database.
Set the site wastage data of each material. This refers to the additional quantity of each material that goes to waste during the construction phase. Default values are based on data in the Boverket database. Adjust the data source for Boverket data if needed.
Document the sources of transportation and site wastage data for each material. If you have used Boverket default values for these parameters, select 'Generiska klimatdata' from the dropdown menu. If you have used project specific data or data from the EPDs, select 'Specifika klimatdata'.

Input data for construction site operations

Add the construction site electricity, district heat and fuel consumptions to their respective sections in the question form using the Boverket energy datasets.

In Klimatdeklaration, only Boverket emission factors are allowed to be used here, and the data available in the tool reflects this.

Building Information (optional query)

Fill in this optional query to generate an XML file which has all the information that is needed for submitting a Climate Declaration to Boverket. Information entered here will automatically be added to the Boverket hand-in page if the user chooses to import the XML file. Only the inputs relating to scope coverage affect calculations.

Building area - Add the building type and "Bruttoarea" (BTA/GFA). For buildings with mixed-use, provide the area of all the different building types.
Building part areas - Fill in the information which is relevant to your building.
Acoustic and Energy Class - Fill in the information which is relevant to your building.
Scope coverage definitions - Based on the input in this section, the scope coverage rate (täckningsgrad) is calculated. There are two different options for how the calculation can be performed in One Click LCA.
- 'Material mass for full scope' uses the total mass of the building as the basis for the calculation. The user should add the total mass of the building as an input (in kg or ton). The software automatically calculates the mass of all materials that have been added in the building materials query. The scope coverage is automatically calculated by dividing the total mass of the materials entered into the software by the total mass of materials in the building entered by the user.
- With 'User-defined ratio', the user inputs the scope coverage percentage (%) themselves as a basis for the calculation. One should add the share of materials the user has included in the 'Building Material' query divided by the all the materials in the building including those not included in the calculation (for example 90% of the total materials of the building) and this percentage is used to scale the emissions accordingly to cover emissions of a full mandatory scope of the building. The percentage can be calculated based on either mass or cost.

Mass ratios of load-bearing elements - Select calculation method for XML export
- The automatic export automatically calculates the share of different material types and adds the mass ratios in the Boverket submission. The share of different load-bearing material types can also be seen in the result page. Please note that in Boverket these values are rounded to the closest tenth automatically when exporting the XML file from One Click LCA.
- If the user selects Manual Selection, the user should input the share of different material types for load-bearing building parts to sections 6 (Foundation) and 7 (Other). These values will then be used in the XML file export. Boverket specifies the options Concrete, Steel, Wood and two categories for “Other” which users can name. Please note that the result page results will still show the automated calculation results based on the user inputs in the 'Building Materials' query.

Review Results & Download Reports

Accessing Results

You can find your results in two ways:

From any input query page: Navigate directly to the results page.
From the design input menu: Open the menu for your chosen design and select "View results."

Understanding Your Results

The results page contains two main results tables:

Main Results Table:
- Shows the global warming potential (GWP) impacts in kg CO2e.
- This breaks down the impacts by different life cycle stages.
- Uses conservative values for any Boverket materials.
- Important: Use this table for submitting results to the Boverket registry.
Additional Results with Typical values for Boverket Data:
- - Shows results using typical data for Boverket materials (instead of conservative values).

There are also other tables on the Results page:

Main results (conservative values) adjusted based on scope coverage
- Here the conservative results, including the top-up based on the scope coverage (täckningsgrad) is shown.
Scope coverage ratio calculation based on mass
- Here, the total mass of all the inserted materials in the materials query, including site wastage, is calculated and shown. The mass shown here is used for the calculation of the scope coverage if the user has chosen the automatic option in the Building information tab.
Load-bearing constructions (% of quantity)
- Shows the automatically calculated material mass ratios for this design. The calculation is based on the inputs in the materials query and the material type classification that has been pre-assigned to each resource by One Click LCA. These values will be used as a basis for the relevant figures in the XML export if the users select the automatic quantity export setting in the Building information query.
Data Sources GWP %:
- Shows the percentage of EPDs, Boverket data, and other data sources used to calculate the total global warming potential.

Downloading Results

XML File for Boverket Submission: Go to "More actions" and select 'Generate Klimatdeklaration XML'. The XML file can import the results to Boverket’s hand-in page for climate declarations.
XLXS File created according to Boverket's template: Go to 'More Actions' and select 'Klimatdeklation-IOBC - XLSX results report'. The XLSX file presents calculation results in the format of Boverket’s template “Mall för beräkningsunderlag”.
Full Results Report: Also available under "More actions." Select "One Click LCA results report" to open a separate window with a detailed material-level results table, which can be downloaded in Excel format. Both conservative and typical Boverket values are shown for each material.

In the Graphs section, it is also possible to choose between conservative and typical results by clicking on “Change impact category”. It is also possible to change classification system between BSAB and the Boverket building part classification by clicking on “Classification”.