The Complete Guide to Roofing Insurance Supplements (2026)

A roofing insurance supplement is a formal request asking the carrier to fund line items that were missed, underpaid, or incorrectly scoped in the original claim estimate. It compares the contractor’s actual scope of work against the carrier’s Explanation of Review (EOR) and documents the difference so the carrier can approve the additional amount.

Supplements exist because the first estimate a carrier produces is rarely complete. The scope is built quickly, often from a limited inspection, and standard components of a proper roof replacement get left off. A supplement puts those items back on the estimate, with the documentation to support them.

Carrier estimates are generated in estimating software (most commonly Xactimate) from the adjuster’s field notes. Three things drive underpayment:

• Speed. Adjusters carry heavy claim loads, especially after a storm. Scopes get built fast and components get missed.
• Default templates. Standard line items like starter, ridge, and drip edge are frequently omitted unless specifically added.
• Code and manufacturer requirements. Local building-code upgrades and manufacturer installation requirements are often not scoped at all.

None of this is a coverage question. A supplement does not argue about what the policy covers — it documents the work the approved scope actually requires.

These are the recoverable items that show up on supplement after supplement:

This is a partial list. Which items apply depends on the roof, the code jurisdiction, and the manufacturer’s requirements for the product installed.

Industry figures put typical recovery at $3,000–$8,000 per claim, or roughly 20–40% above the carrier’s initial estimate. The exact number depends on how much was missed on the first estimate, the carrier, and the roof.

These are industry ranges, not a promise — every claim is different, and some estimates are already close to complete. The only way to know a specific claim’s gap is to review the EOR against the real scope.

These two get confused, and they are not the same thing:

• A supplement adds new, missed scope to the claim total — money the carrier has not yet approved.
• Recoverable depreciation is money the carrier already approved but holds back until the work is completed and documented.

Both can be active on the same claim. Getting held depreciation released is usually a matter of submitting clean completion documentation — a final invoice that matches the approved scope, plus photos. Supplement Desk tracks held funds and helps make sure they get released. Released depreciation is money the carrier already owed you — it is outside our success fee.

1. Review. We compare your carrier EOR against your estimate and the claim photos to find every missed and underpaid item.
2. Build. We assemble the supplement packet — line items, supporting documentation, code and manufacturer references.
3. You approve. Nothing goes to the carrier without your explicit approval — you review and set the parameters first.
4. We submit & negotiate. Under the service agreement, we submit the approved packet to the carrier and handle the back-and-forth on your behalf. The carrier reviews and issues a revised estimate; additional rounds follow the same pattern if needed.

The goal is a packet so well-documented that the carrier has a clear basis to approve it.

Supplementing well takes estimating skill, Xactimate access, and time on the phone with carriers. The math on doing it in-house:

• A dedicated supplement specialist runs $45,000–$75,000/year in salary alone.
• Xactimate access and training adds $1,500–$3,000/year.
• Plus management time and the back-and-forth with carriers.

Below roughly 100 insurance jobs a year, outsourcing usually wins on pure economics — you pay only when money is recovered, with no fixed salary or software cost. Above that volume, an in-house hire can make sense.

• Not public adjusting. A public adjuster represents the homeowner in the claim. Supplementing is contractor-side — documenting the scope of the work you perform. Supplement Desk works for the contractor, not the insured.
• Not legal work. No demand letters, no statutory arguments, no litigation. Supplements are scope-and-documentation, not legal disputes.
• Not a coverage opinion. We do not interpret policy language or argue what is covered. We document the work the approved scope requires.

To review a claim we need the carrier EOR, your contractor estimate, and claim photos. The full checklist — and why each document matters — is on our What to Send page.