<p>That&#39;s the classic spec-change ripple: a client swaps a $1,500 door for one with different hardware, fire rating, or frame requirements, and by the time it&#39;s caught, framing, electrical rough-in, and finish schedules have already moved on without it. The $1,500 line item balloons to $7,500 once you factor in rework, change-order delays, and labor pulled off other tasks to fix it.</p> <p>The root cause is almost never the door itself — it&#39;s that scattered spreadsheets and disconnected takeoffs don&#39;t catch the change fast enough. A door swap buried in a model update can sit unnoticed for weeks.</p> <p>BidLight is built to close that gap. Because it lives inside Revit and reads your model directly, cost updates happen in real time as the design changes — not after someone remembers to re-run a takeoff. Here&#39;s how it plays out with BidLight in the loop:</p> <ol><li>The design team updates the door family in Revit.</li><li>BidLight&#39;s AI reclassifies the BOQ line item automatically, using current pricing from its database and sources like RSMeans.</li><li>The updated labor, material, and equipment cost surfaces immediately, not at the next scheduled estimate.</li><li>You see the delta right away and can flag it before it cascades into other trades.</li><li>You go to the client with a defensible number instead of a surprise change order.</li></ol> <p>That&#39;s the difference between chasing costs after the fact and catching them the moment the model changes.</p>