A room drawing can be accurate and still be incomplete.
The drawing shows where the microphone ended up. It often does not show why the approved location was missed, which alternative was rejected, or what condition made the exception acceptable.
That gap matters later. When a furniture layout changes, or a support team inherits the room, the question is not “what was built?” It is “does the original constraint still exist?” If nobody recorded that, the workaround starts to look like policy.
This is where a short decision record helps. I would capture four things: the constraint, the chosen exception, the tradeoff accepted, and the trigger for review. Keep it attached to the room, the drawing revision, and the person responsible for the decision.
That mirrors a basic principle in architecture and meeting-planning guidance: hybrid and conference spaces work better when the pre-planning assumptions are explicit, not implied. ISO’s draft guidance for hybrid meeting service and IETF’s guidance for fully online meetings both put preparation ahead of improvisation. AVIXA’s room design guidance makes a similar point about designing for future constraints instead of assuming the room will stay unchanged.
The point is not to document everything. It is to leave enough context that the next engineer can tell the difference between a deliberate exception and a forgotten shortcut.