tallyCAT can be used from schematic design through to as-built digital twins. For best results, use an Autodesk® Revit® model with quantities and materials fairly well detailed, at least for the most massive components (foundation, core, shell) and with the materials labeled.  

• Create a free EC3 account at https://buildingtransparency.org/auth/register.   
  • For the most integrated experience, link your EC3 account to your Autodesk account in your EC3 user profile
• Export material quantities from Revit into EC3
• Identify each material (concrete, steel, gypsum…)
  • tallyCAT starts you with a reasonable guess
  • Users should refine each material search
• Evaluate climate impact based on product-specific 3rd party verified EPDs.
• Visualize hot spots and the biggest carbon reduction opportunities
• Generate graphs and reports
• Synchronize between Revit and the EC3 model in the web
• Annotate your Revit model & components so you can reuse your work
• Save libraries of materials and assemblies for future use

To install, download and open the MSI. 

• You will need administrator access to install it.
• By default, tallyCAT installs for Revit versions 2020 through 2024. You can restrict it to only a few versions during installation.  
• tallyCAT will automatically check for updates and prompt you when a new update is available.

To uninstall, use the Windows add/remove programs feature.  

Default install locations:

• Addin data in "ProgramData\Autodesk\ApplicationPlugins\tallyCAT.bundle"
• Binaries in "Program Files\C-Change Labs Inc\tallyCAT"
• User files in "Users\[USERNAME]\AppData\Local\C-Change Labs Inc\tallyCAT"

This means that it places tallyCAT addin data to "ProgramData\Autodesk\ApplicationPlugins\tallyCAT.bundle"

and the plugin binaries to "C:\Program Files\C-Change Labs Inc\tallyCAT"

Also, the plugin should be available for every user on that machine. The user data goes to "C:\Users\[USERNAME]\AppData\Local\C-Change Labs Inc\tallyCAT"

tallyCAT is a free sustainability plugin by BuildingTransparency.org, a Washington State environmental charity.

• Software development by c-change-labs.com
• Developed in partnership with Perkins+Will.
• tallyCAT Library Browser original design courtesy of the Design Technology Team at ZGF Architects
• tally® original design courtesy of KT Innovations
• We gratefully acknowledge the financial support of the Province of British Columbia through the Ministry of Energy, Mines and Low Carbon Innovation.