SelectionAggregate V0.1

A lightweight Revit plugin for aggregating selected elements with filtering, undo support, and saved results.

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Features

• Aggregate common parameters from selected Revit elements
• Supports operations like Sum, Average, Count, Min, Max
• Filter selected elements before calculation
• Save results for later reuse
• Rename, update, or delete saved results
• Restore element selection from saved results
• Undo previous selection changes
• Automatically handles missing/deleted elements
• Persist saved results locally (JSON-based)
• Integrated directly into the Revit Add-Ins ribbon

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Workflow

1. Select elements in Revit
2. Open SelectionAggregate from the Add-Ins tab
3. Choose a parameter and aggregation operation
4. Click Calculate
5. (Optional) Apply filters
6. Click Save Result
7. Manage saved results via right-click menu

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Installation (Revit 2026)

1. Close Revit
2. Copy the following files into:

C:\ProgramData\Autodesk\Revit\Addins\2026

• SelectionAggregate.dll
• SelectionAggregate.addin

3. Launch Revit
4. Go to the Add-Ins tab
5. Open SelectionAggregate

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Notes

• If some elements in a saved result no longer exist,
  use Update Element Selection to sync the record

• Saved results are stored locally on your machine

• This version is tested for Revit 2026 only

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Built With

• C#
• WPF
• Autodesk Revit API
• .NET

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Screenshot

Main Workflow

Filter + Undo

Saved Results

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Future Improvements

• Multi-version Revit support
• Dynamic selection (live updates)
• Advanced filtering (string conditions for family/type)
• UI polishing and customization

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License

MIT License