• No new license is required for this version.

• Client License Service Version - no update is required for this release.

• License Server Version - this relates only to perpetual licenses and the Server (Sentinel RMS) license method. Provided your license server has been updated to version 6.0 or later no update is required for this release.

• This service pack requires Tekla Structural Designer 2025 first release or later to be installed and will update your current version.

• Integration

  • Tekla Structures - if you wish to integrate with Tekla Structures for optimum performance you should install both this release and Tekla Structures 2025 (and the most recent Service Pack for this).

  • Tekla Tedds - for integrated design using Tekla Tedds you should install Tekla Tedds 2025 AND ensure you have installed the latest updates for this. These can be obtained from Trimble Downloads.

  • Tekla Portal Frame and Connection Designer 25 - if you install this release and use Tekla Portal Frame Designer and/or Tekla Connection Designer you should install Tekla Portal Frame Designer 25 and/or Tekla Connection Designer 25 available from Trimble Downloads.

  • Autodesk® Revit® - the most recent Tekla Structural Designer Integrator for Autodesk Revit 2025 was released in April 2025. For more information about this see the Tekla Structural Designer Integrator for Autodesk Revit 2025 SP1 Release Notes. The installation for this is available from Trimble Downloads. If you are now using Autodesk Revit 2025, you can install this to perform BIM integration with Tekla Structural Designer.

    • Supported Revit Versions - the other currently supported Revit versions are: Tekla Structural Designer Integrator for Autodesk Revit 2023 SP2 and Tekla Structural Designer Integrator for Autodesk Revit 2024 SP2. The installation for these are available from Trimble Downloads. If you are performing BIM integration with any of these previous Revit© versions, we recommend you install the latest version of the associated Integrator.

• Previous Versions and file compatibility - files from all previous versions can be opened in this release, however note that, once saved, they cannot then be opened in a previous release. If you wish to retain this option we therefore recommend using the File > Save As… option to save a copy of the file in the previous release and retain the original.

• General performance and stability improvements

  This release includes several additional fixes, not explicitly detailed here, that enhance overall performance and stability.

• [TSD-18381/18382] - Combination Generator: Easier management of Loading Scenarios

  Previously, although three default combination scenarios were available, creating new scenarios was not straightforward.

  

  Additionally, after defining multiple scenarios, activating combinations by scenario required manually selecting the appropriate checkboxes.

  

  These processes have been enhanced as follows:

  • On the Combination Generator dialog, scenario radio buttons have been introduced.

    

    • By default (as shown above), generated combinations are not assigned a scenario. However, you can select an Existing scenario.

      

    • Alternatively, you can create a New scenario.

      

  • On the Combinations dialog, a new By Scenario button simplifies setting combinations to be active by scenario.

    

    • Clicking By Scenario displays a dialog with an Active checkbox for each scenario.

      

      • If none of the combinations in a scenario are active, its box is unticked.

      • If some of the combinations in a scenario are active, its box displays a square block.

      • If all of the combinations in a scenario are active, its box is ticked.

    • After making your desired changes, click OK. All Active checkboxes on the combinations page will update accordingly.

      

• [TSD-18384] - New US Customary Density unit: lbf/yd³ introduced

  The default Density unit for US Customary settings was previously lbf/ft³. A lbf/yd³ unit has been added. To apply this unit to existing models, update the Density unit through the Model Settings dialog. To make lbf/yd³ the default for new models, update the Density unit for the active settings set in the Settings dialog.

• [TSD-18385] - New US Customary Volume unit: yd³ introduced

  The only Volume unit for US Customary settings was previously ft³. A yd³ unit has been added. To apply this unit to existing models, update the Volume unit through the Model Settings dialog. To make yd³ the default for new models, update the Volume unit for the active settings set in the Settings dialog.

• [TSD-18379] - Wall support fixity graphics enhanced

  In previous releases, a triangular prism indicated a wall support in 3D views, regardless of the wall fixity provided.

  

  In Release 2025 SP3, when a support is fully fixed (all 6 degrees of freedom are fixed), it is now represented as a rectangular prism. For all other wall support configurations, the triangular prism is still used.

  

• [TSD-18317] - BREVe wind site selector map colors updated

  The BREVe site selector map colors in the wind wizard (per BS EN 1991-1-4 and BS 6399-2) have been updated to a more modern appearance.

  

• [TSD-18470] - Frame views orientation corrected

  An error in Release 2025 SP2 that affected the orientation of structures in Frame views has been corrected.

• [TSD-18115] - Trimble Assistant: Now fully supported

  The Trimble Assistant for Tekla artificial intelligence (AI) chat service was initially introduced as a preview feature in Release 2025 SP2. It was disabled by default. In this release, it has been upgraded to a fully supported feature and is now enabled by default.

• [TSD-18176] - Reference Models now displayed in 2D views

  Previously, when a reference model was imported, it appeared in a transparent gray color only in 3D views. It is now also displayed as a shadow layer in 2D level and frame views.

  To control the display in these views, a new "Shadow layer" tab has been added to the Edit Reference Model dialog, as shown below. This tab allows you to toggle the shadow layer on or off, change its color, and set the cut depth for displaying the reference model geometry in horizontal and vertical planes.

  

• [TSD-18178] - Snapping to Reference Models in 2D views now possible

  When a reference model is displayed in a 2D view, you can now snap to corners and intersections of its lines. This functions similarly to snapping to lines in a DXF shadow.

• Remoting API Enhancements

  There have been some enhancements to the Open API with this release - for information about these see the Tekla Structural Designer 2025 Open API Release Notes.

• [TSD-18451] - Double angles not included in IFC export

  An issue has been fixed where Back-to-Back L sections were being omitted from IFC Exports. Similarly for Back-to-Back and Toe-to-Toe channel sections.

• [TSD-18455] - Speed of analysis

  This service pack enhances analysis performance, especially for models containing numerous structural walls. This improvement addresses slowdowns that were introduced by new features in Tekla Structural Designer 2025.

• [TSD-17365] - Slab meshing procedures

  Due to ongoing enhancements, adjustments have been made to the meshing process for two-way spanning slabs. This may result in a slightly different FE mesh compared to previous versions, though a significant impact on results is not anticipated.

  If you encounter any issues with the new meshing, the Use legacy slab meshing option is available in the Analysis Settings dialog. Selecting this option will generate meshes identical to those produced before this service pack.

  

  If you encounter any issues with the new meshing, please report them to our support team so they can be addressed. The option to use legacy meshing will be removed in a future release.

  As part of this enhancement, the Scene Content entity information controls for Slabs have also been updated.

  

  The highlighted controls shown above now work as follows:

  • Mesh - shows a preview of the mesh that will be created next time you run analysis.

    

  • Mesh - area edges - shows a preview of the boundaries of the individual mesh groups.

    

  • Mesh - points of interest - shows a preview of the points of interest that act as seed nodes for the mesh.

    

  • Adjustments have been made to how the automatic merging distance between openings and slab edges is applied during FE mesh creation. This change is expected to reduce the number of mesh quality warnings. For guidance on adjusting merging distances to minimize such warnings, refer to: Slab meshing controls.

• [TSD-18665] - Modal Analysis - Mass normalized mode shape values

  At user request in a previous release, we introduced units to the headers of tabular data for mode shapes. Unfortunately, this introduced two issues:

  1. It caused additional confusion for most users.

  2. For US units a unit conversion error meant that the values reported did not correctly evaluate to modal mass = dimensionless 1

  In this service pack units have been removed from the headers of mass normalized mode shape displacements tables and the issue for US units has been corrected.

  It's important to note that the underlying analysis was correct and is unchanged. For more information please refer to: Modal mass.

Masonry Wall Design using Tekla Tedds

This release introduces the following improvements for Masonry Wall Design using Tekla Tedds:

• [TSD-18386] - Split mat foundations and slabs into separate sections

  In ‘Material Listing’ reports, slabs and mats are now separated, providing distinct quantities for materials and reinforcement.

  

  

  

  

• [TSD-183877] - Pile reinforcement tonnage in material lists

  In ‘Material Listing’ reports, pile reinforcement is now reported with pile type, number of piles and total mass.

  

• [TSD-18388] - Option to omit combination name in Foundation Reactions report

  After selecting the settings for the 'Foundation Reactions' report chapter (as shown below), a new option, Show loading number instead of full name, is now available in the Foundation Reactions Settings dialog.

  

  By default, this new option is unselected, meaning combination names will appear in the report as they did previously.

  

  When this option is selected, the combination number is displayed, but the load combination name is omitted. (Previously, when Combination Factors were set to Service (as shown above), including the combination name caused confusion among foundation subcontractors, who might have mistakenly interpreted the reactions as strength/factored values.)