<p>BidLight catches it by comparing the revision where the door changed against the one before, so the change appears as soon as someone publishes.</p> <p>The expensive version of this story starts when someone swaps the door spec, adds hardware or changes the frame detail and nobody tells the other trades. Then rework and change orders pile on around it.</p> <p>Here is how BidLight stops that:</p> <ul><li>Publish from Revit or Navisworks. Each publish is a snapshot with author and milestone.</li><li>Compare it with the previous revision. The door and the elements it touches show up, grouped by category.</li><li>Pin an issue to those elements. It carries the sheet and revision.</li><li>Assign an owner. They see it in the 6am digest.</li><li>Close it with a screenshot, a tagged user and the model commit.</li></ul> <p>The saving is when you see it. In the model it costs about $50. On site it costs $5,000 to $50,000.</p>