Compare Contractor Estimate Revisions Line by Line

Treat every revision as a new document

A contractor estimate revision is a separate artifact even when the filename says final. Save the version exactly as received, record the date and sender, and give it an internal version label such as v1, v2, or v3. Never overwrite the earlier file. The comparison only works when both versions still exist.

Ask the contractor for a change summary when one is available, but do not rely on it. Contractors sometimes describe a change as a clarification when the quantity or price actually moved. The line-item comparison is the control; the cover note is a convenience.

Match line items before comparing money

Match on trade, room or elevation, unit, and description before matching on price. A line for tear-off and a line for disposal are not the same item even if they sit next to each other. If a line was split or combined in the new version, record the mapping explicitly so the total delta can be explained.

Use a comparison table with old quantity, new quantity, old unit price, new unit price, and a short reason for the change. The reason may be unknown; write unknown rather than inventing one. The adjuster needs to see where the estimate moved, not a narrative that makes every change sound expected.

Separate quantity changes from price changes

A roof revision that adds four squares is a quantity change. The same squares at a higher unit price is a price change. Both can appear in one revision, and they have different review questions. Calculate the effect of each separately so a single blended percentage does not hide a pricing dispute inside a scope increase.

Example: v1 lists 28 squares at 310 dollars; v2 lists 32 squares at 342 dollars. The quantity effect and the unit-price effect should be shown as separate rows. If the contractor also removed a dumpster line, show that reduction. A net difference alone can make a large addition and a large removal look like a small change.

Use the specialist service role as a starting point for scope, source evidence, and decision boundaries.

Cross-reference photos and the scope narrative

For each added line that changes the visible scope, name the photo or inspection note that supports it. If the new line is interior work and the photo set contains only the exterior, mark the evidence gap. Do not conclude that the work is unnecessary; conclude that the file does not yet show it.

Keep photo references stable by using the original file names and the capture date. A photo renamed to match a room can lose its provenance. If the contractor supplies its own photo set, label it as contractor-provided and keep it separate from the carrier's inspection images.

Send the adjuster a delta brief, not a new estimate

The brief should state the versions compared, the total change, the largest quantity and price movements, the removed lines, the evidence gaps, and the questions that require a decision. It should not restate the entire estimate or recommend an approval amount.

Close the loop by recording the adjuster's response and linking it to the version it addresses. If a third revision arrives, compare it with the version the adjuster actually reviewed, not only with the original. That prevents a decision from being applied to the wrong document.

The public guidance from Insurance Information Institute can help the accountable team test assumptions without replacing local professional review.