Contractor Estimate vs Insurance Estimate: How to Find Missing Scope

Why Estimates Disagree

Insurance adjusters and contractors produce estimates using different tools, pricing databases, and scoping methods. Insurance adjusters typically use Xactimate with carrier-set pricing, while contractors estimate based on actual material costs, labor rates, and subcontractor bids.

The differences fall into three categories:

• Price discrepancies — the same line item appears in both estimates but at different costs. Example: insurance estimates architectural shingles at $4,620 while the contractor prices them at $6,490.
• Missing scope — items in the contractor estimate that are completely absent from the insurance estimate. Example: tear-off, underlayment, or ice & water shield not included.
• Quantity mismatches — both estimates include the item but disagree on the quantity. Example: insurance measures 18 squares of shingles while the contractor measures 22.

Step-by-Step Comparison Process

Step 1: Extract Line Items

List every line item from both estimates in a spreadsheet. For each item, record the description, quantity, unit price, and total cost. Make sure to include items from both documents, even if they only appear in one.

Step 2: Match Items Between Estimates

This is where most contractors struggle. Insurance estimates and contractor estimates use completely different terminology for the same work. The insurance estimate might say "R&R Comp. shingle roofing - 20 yr." while the contractor writes "Install architectural shingles (Owens Corning Duration)."

Go through each contractor line item and find the corresponding insurance line item. Mark items as matched, missing, or unmatched.

Step 3: Calculate Variances

For matched items, calculate the difference between contractor and insurance pricing. For missing items, the full contractor cost is the variance. Sum all positive variances — this is your supplement amount.

Step 4: Document with Code References

For each missing scope item, identify the IRC code section or manufacturer specification that requires it. Code-backed supplement requests have significantly higher approval rates than those without citations.

The Terminology Problem

The biggest challenge in comparing estimates is the terminology gap. Xactimate uses standardized line item codes (like "RFG 250") while contractors describe work in plain language. This creates false mismatches where an item appears "missing" from the insurance estimate when it's actually present under a different name.

Common examples of the same work under different names:

Automating the Comparison

Manual comparison is tedious and error-prone, especially with the terminology differences between insurance and contractor estimates. Modern tools can match items semantically — understanding that "R&R Comp. shingle roofing" and "Install architectural shingles" refer to the same scope of work.