Plans Need History

A building design changes over time and involves many contributors. Version control offers a way to preserve earlier states, compare alternatives, and record why a decision was made. That history can help a team understand a change instead of relying on file names or memory.

Compare the alternatives before combining

Four views of an explicit rectangular baseline. A and B propose normalized wall locations; changing both to different values creates one unresolved field. Combined envelope area is arithmetic, not an automatic accepted merge; no rework-cost or project-history claim is asserted.

Parallel alternatives are another useful comparison. A team can explore different structural approaches, keep each path legible, and return to a prior option if the decision changes. A concise change note—what moved and why—connects the record to the design itself.

Building models are complex, and a Git-like workflow would need tools that understand their parts and relationships. The analogy describes the value of traceable change; it does not imply ordinary source-control tools can manage every model directly.