Frequently Asked Questions

General questions about LCAbyg

Is there a new version of LCAbyg for Windows 11?

The latest version of LCAbyg can be used for both Windows 10 and 11. Download here.


Is there a version of LCAbyg for Mac and Linux?

Mac OS version developed. Download here.
Linux is not currently supported but is potentially being developed.


Is there an English version of LCAbyg?

An English version is under development.


Why does LCAbyg 5 look very large on my computer screen?

The reason may be a setting on your computer, which results in LCAbyg looking great. Feel free to check this out first.

Otherwise, there is an option for scaling in the upper right corner of LCAbyg. Remember to restart LCAbyg.


Which third-party integrations can be used in LCAbyg.

It is possible to use the Json format as third-party integration.

Integration via IFC is under development.


Is it not possible to make a project comparison in LCAbyg 5 as you could in LCAbyg 3.2?

The project comparison function has been discontinued in LCAbyg 3.2. However, an improved function is being developed to compare projects and components in LCAbyg 5.


Is it possible to export LCA-results to an Excel-fil?

The LCA results for the building model can be exported to an Excel file. Under the menu item 'Results,' you can select 'Export Excel,' after which the destination where you want to save the Excel export is selected. With this, all results on the building model are available.


Is it possible to compare different variants in the same project in LCAbyg 5?

It is currently possible to set up and compare variants of, e.g., building components and other components in LCAbyg 5. If variants are created with the same functional unit (i.e., quantities, technical properties, and lifetimes), they can be compared in LCAbyg 5.


Is it possible to save the analysis graphs in SVG files?

You can save the charts in LCAbyg 5 as SVG files under 'Analysis and report' via the 'Save chart' function.


Is it possible to import old files from LCAbyg 3.2 to LCAbyg 5?

Ongoing LCA models and older LCA models can be transferred to LCAbyg 5 via the import function 'Create a new project from v3.2'. This function is beneficial when you are interested in updating the calculation basis for the LCA and the data basis. It is also possible to import a library initially created in LCAbyg 3.2, in LCAbyg.

         Unable to create a stage

Check the following:

  1. Always fill from top to bottom. It is important that the general information is filled before entering the indicators.
  2. If you are copying indicators from a pdf or something else, be aware that there are no spaces before and after the numbers. If the box with indicators is red, it means that the stage has not been added.
  3. When entering the indicators, note whether it is (,) or (.). LCAbyg only understands (,).

Error in LCAbyg

Why can't I export a report to PDF?

The report function in LCAbyg and is sensitive to incorrect naming of user-created building parts, constructions, materials, and phases. In addition, it is crucial not to type space with 'tab' and make a line break. We always recommend downloading the latest version of LCAbyg.


Why can't I see my imported EPD files in LCAbyg 5?

The imported EDP file (.lb5epd) will appear in the building materials or phase library, accessed via the book icon.

JSON & LCAbyg_debug

What is the JSON format?

Third-party integration used outside LCAbyg's interface to create everything from entire projects to component libraries. It is also possible to extract results for his project in JSON. Watch or re-watch our webinar on the intro to the JSON format on LCAbyg's Youtube channel.


Where can I find a guide about the Json format?

There is an English guide to json projects which can be downloaded here.

We are currently updating the guide and dividing it into several short guides (json guide project, json guide export, json guide scenarios, and json guide components).

An updated version of json guide export can be downloaded here.

An updated version of json guide scenarios can be downloaded here.

Updated versions of the json guide project and json guide components will be published at the beginning of March 2022. The guides are continuously updated, so you must always download the latest version.


LCAbyg_debug.exe will not open or crash when I try to open my Json project.

Check that the file 'engine.yalm' has no errors. Examples of typical errors are incorrect indexing, incorrectly placed characters, e.g. - character. To help troubleshoot, type 'cmd' and press 'enter' in the path where lcabyg_debug.exe is stored. This will open a terminal describing errors in your engine.yalm file.


How can I check that my json files are correct?

We recommend that you regularly test that you import your json project into LCAbyg. By opening LCAbyg_debug you can get error messages printed in the LCAbyg terminal.

Note that LCAbyg does not work if you place the cursor or type inside the terminal, and if you make changes to the json project, you must restart LCAbyg_debug.

You can read more about the debug feature in the updated guide on json projects (coming out early March 2022).


How can I find out why I get the "Missing UUID" error message in the LCAbyg_debug.exe terminal?

You can search your json file/files in Notepad ++ and check that all UUIDs are written correctly, that you have not inserted the UUID incorrectly or that you are missing UUIDs.


Why does the same error message appear twice in the LCAbyg_debug.exe terminal?

It does not affect the overall error. Both error messages will disappear by resolving one of the two identical errors and restarting LCAbyg.exe.


What does the following error message mean: Collision between CategoryToConstruction(069983d0-d08b-405b-b816-d28ca9648956) and ElementCategory(069983d0-d08b-405b-b816-d28ca9648956” ?

Often this error is because the unique ID has been used more than once. Therefore, check that the unique ID or referring unique ID has not been used more than once.


What does the following error message mean:“Missing target/source at badfcf92-804a-5902-a5c4-0ea1460c202e for ConstructionToProduct(0dd0b7a2-6f15-496c-88e0-8b64bcb663ba)” ?

If you have created node and edges for nodes, and then deleted some of nodes, then the referring/related edges must also be deleted. One way that "blank" edges can be found quickly is by opening the json project in Nodepad ++, and then performing a search on "amount: 0", which returns the search result for all blank edges in the searched json file/project.


When I export the building model from LCAbyg to json, I can not find any constructions.

If you have only used the gen_dk library to model your constructions, then no constructions are exported to json, as they are already in the gen_dk folder, built into LCAbyg.


Why do I get the error message ”Collision on Building…” , when importing a component for an existing project in LCAbyg?

One reason may be that your import component is not set up correctly or that you have imported a non-UUID component that already exists in an LCA building component.


Why can I not open the import example?

This may be because you are using different version og respectively the import example and LCAbyg. For example, a change has been made to the edge, CategoryToStage, from verison to It is therefore important that you download the latest version of LCAbyg and the latest version of the Json guide.


Where can I fint the import example?

You can find the import exmaple in the zip folder when you down the Json guide here: User manuals and other tools

Excel tool (lite)

What is Excel tool (lite)?

The Excel lite tool can be used to build the building model via Excel, intended for the earlier design phase and faster import of the building model.

Excel lite is continuously developed. If there is feedback, you can write to the lcabyg mailbox


Is there a guide to Excel tool (lite)?

Introduction and help can be found in a sheet in the Excel file, which can be downloaded here.


Is there a version of Excel tool (lite) for Mac?

Currently, the Excel tool does not work for Mac (import of the csv file). This will be developed soon.


Why do I make a mistake when copying a row?

To copy a row, paste it at the bottom / below the existing rows.

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