The addendum survival guide for concrete bids

The addendum that lands at 3 PM the day before bid is a stress test of your estimating system. Here's how to absorb it without rebuilding the bid.

Every estimator knows it. The plans you've been pricing for two weeks just got a Revision 4. Footing depths increased 6". Pier diameters bumped from 24" to 30". The slab thickened from 5" to 6". You have until 10 AM tomorrow.

If your bid lives in spreadsheets, you're rebuilding. If it lives in Bedrock, you're editing.

1. Open the addendum side-by-side with your bid set. Mark up only the sheets that changed. Sheet identifiers (S-201, S-301) are how you track scope changes back to assemblies. 2. List the parameter changes, not the sheet changes. "Footing depth +6 inches" is one line. "Sheet S-201 revised" is not actionable. 3. Quantify before you re-price. A 6" footing depth change is a known % concrete delta. You can sanity-check the new total before you adjust anything in the bid.

In Bedrock, the takeoff doesn't change. The assembly does. You change Footing Depth from 12" to 18" and every footing measured against that assembly gets new concrete CY, new rebar lb, new excavation CY, new formwork SF. The estimate updates. The proposal updates. The total updates.

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