Suggested title for Revit Ideas BIM Model Timeline — Native Design Stage Snapshots and Model Comparison Idea summary Revit should have a native model timeline that allows users to create intentional, read-only snapshots of the BIM model at key design-development milestones—without duplicating the entire model geometry inside the active project and without confusing design stages with Revit construction Phases. Current problem During a project, the BIM model evolves continuously. A wall may exist during Concept Design, move during Schematic Design, change construction during Detailed Design, or be removed during the Construction Documentation stage. Today, preserving those historical states usually requires separate RVT copies, cloud version history, manual exports, or workarounds using duplicated elements, design options, or phases. None of those approaches provides a simple, intentional 'design timeline' inside the Revit authoring experience. Revit Phases are primarily intended to describe changes to the building over time—Existing, Demolition, New Construction, etc.—not the evolution of design decisions. Proposed solution Add a native BIM Model Timeline where the user can create named checkpoints of the current model state, for example: > Concept Design — CD-01 > Schematic / Preliminary Design — SD-03 > Permit / Legal Design — PD-01 > Detailed / Executive Design — DD-02 A checkpoint would be read-only and lightweight. Instead of keeping multiple complete copies of the building active in the same RVT, Revit could store the information required to reconstruct the model state at that checkpoint—such as element additions, removals, geometry changes, type changes, and parameter changes. Suggested functionality > Create a named snapshot/checkpoint from the current model state. > Display checkpoints on a chronological project timeline. > Open any historical checkpoint in read-only mode. > Return instantly to the current/live model. > Compare any two checkpoints or compare a checkpoint with the current model. > Visually highlight Added, Removed, Modified, and Unchanged elements. > Allow filtering comparisons by category, workset, discipline, level, phase, or parameter. > Show property differences for a selected element between two checkpoints. > Optionally associate a checkpoint with revision, issue date, project status, author, and comments. > Allow sheets/views to reference the historical state for review without duplicating the active geometry. > Keep this system independent from Revit construction Phases and Design Options. Example workflow An architect completes the Preliminary Design and creates checkpoint AP-03. Weeks later, during Detailed Design, a wall is moved and a room layout changes. The architect can open AP-03 from the timeline and see the model exactly as it was when that milestone was approved. They can then compare AP-03 with the current Detailed Design model and immediately identify the wall and room changes. Why this matters > Provides traceability of design decisions. > Reduces dependence on manually created RVT copies. > Avoids overloading one model with duplicated historical geometry. > Helps teams understand when and why model changes occurred. > Improves coordination, QA/QC, client reviews, and change management. > Creates a clearer distinction between design-development history and construction phasing. > Would scale from small residential projects to large multidisciplinary buildings. Possible technical approach The implementation does not necessarily need to store a complete duplicate of the RVT for every checkpoint. A versioned or delta-based system could store changes between checkpoints and reconstruct historical states when requested. Historical states could remain read-only so the active model continues to be the single editable source of truth. Optional comparison interface A dedicated 'Model Timeline' or 'Design History' palette could show milestones such as: CD-01 → AP-01 → AP-02 → PL-01 → EX-01 → EX-02 Selecting two milestones could launch a model comparison mode, with filters and a change list similar to a BIM-focused version-control workflow. Main request Please consider adding a native, lightweight Design Stage Snapshot / BIM Model Timeline feature to Revit, separate from construction Phases and Design Options, so project teams can preserve, inspect, and compare important historical states of the model without maintaining multiple heavy model copies. Suggested tags model history, versioning, BIM, design stages, snapshots, model comparison, collaboration, revisions, workflow, QA/QC Short version (for a limited description field) Revit should include a native BIM Model Timeline that lets users create lightweight, read-only snapshots of important design milestones (Concept, Preliminary, Permit, Detailed Design, etc.). Users should be able to open a previous checkpoint and compare it with the current model, highlighting added, removed, and modified elements. This should be independent from Revit Phases and Design Options. Ideally, checkpoints would use version/delta data rather than duplicating complete model geometry, preserving design history without making the active RVT unnecessarily heavy.
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