How to Review Addendums efficiently as a Flooring Estimator:
An addendum is a revision or clarification issued by the architect or owner before bidding to modify the original contract documents. It may include changes to drawings, specifications, finish schedules, material selections, or project scope. These revisions become part of the bidding documents and must be incorporated into your estimate.
For flooring estimators, overlooking an addendum can result in incorrect quantities, missed scope, or inaccurate pricing. A single change to a finish plan, room finish schedule, or flooring specification can significantly affect material quantities, labor costs, and bid competitiveness.
- Start with the Addendum Narrative
Before opening any drawings, read the addendum description. It usually identifies which sheets, specifications, or finish schedules have been revised. This gives you a roadmap of what to check instead of reviewing every sheet from scratch.
- Compare Old and New Drawings
Open both the previous drawing and the revised drawing side by side. Focus on:
- Finish plans
- Material schedules
- Room finish schedules
- Enlarged finish plans
- Floor plan details
- Transition details
Pay close attention to revision clouds and delta symbols, but don’t rely on them entirely. Some changes may not be clouded.
- Verify Flooring Types
Review all flooring tags and specifications (Carpet Tile, LVT, VCT, Porcelain Tile, etc.) and compare them against the finish schedules from previous drawings. If you find a conflict, note it, base your estimate on the latest drawings.
- Update the Existing Estimate
Instead of starting over, update only the affected areas:
- Replace flooring materials where required.
- Adjust room boundaries if layouts have changed.
- Update transitions, base, and accessories.
- Recalculate waste percentages if the layout has been modified.
Keeping revisions organized in Software saves significant time during multiple addendums.
- Review Specifications
An addendum may not change quantities but could revise installation requirements, adhesives, moisture mitigation, cove base, or transition strips. These changes directly affect pricing even if the measured area remains the same.
- Keep an Addendum Log
Maintain a simple record of every change you make. Include:
- Addendum number
- Maintain separate estimate files for each addendum and include the revision date in the file name
- Scope of change
- Estimating assumptions
This makes it much easier to answer RFIs or explain quantities to project managers.
Final Thoughts
A disciplined addendum review process is just as important as the original takeoff. Accuracy of estimate depends on the estimator’s ability to identify and apply every revision correctly. By comparing drawings methodically, updating only the affected areas, and documenting assumptions, you can produce accurate estimates while reducing the risk of costly omissions.
