<p>Your estimate updates. You do not re-run the takeoff.</p> <p>The model in Revit is the live record of the project. When the structural engineer swaps that beam, the export you publish from the model carries the change. BidLight reads geometry and metadata to classify the BOQ line items at 86% accuracy, then pulls current pricing from its roughly $30,000 database plus Craftsman, 1Build, and RSMeans. Labor, equipment, material, and time costs follow the new beam size.</p> <p>What that saves you is the old loop. Someone catches the swap, someone else re-does the takeoff, and the number you sent last week is already wrong. Instead the same record moves with the design, and every export version is diffed element by element, so you can point to what changed and when.</p> <p>A few things worth knowing:</p> <ol><li>Publish from Revit or from the Navisworks federated model.</li><li>The export is versioned, so the previous estimate stays for comparison.</li><li>Cost rides on the model, not on a spreadsheet beside it.</li><li>If the beam swap causes a clash, you find out before the coordination meeting, not three weeks after the slip started.</li></ol> <p>Your estimate is only as good as the record behind it.</p>