A restoration supplement is not just a request for more money. It documents additional or revised work that was not in the original estimate, explains how newly discovered conditions changed the scope, and gives a reviewer a basis for evaluating the request. The file needs to connect three things: what was found, what work is being requested, and which records support it.

The examples here focus on water mitigation claims where photos and moisture readings may help explain a scope change. Reconstruction work may also be subject to change-order terms in the contractor’s agreement, which will be treated separately in a future article.

Why Supplements Get Pushback

Supplements may face additional questions when notice is delayed, documentation is incomplete, or added work is not clearly tied to the reported loss. A photo may show damage without establishing where it was taken, when it was observed, or which requested item it supports. A single added total can leave a carrier adjuster or TPA reviewer unable to evaluate the individual tasks and quantities on a specific claim.

Documentation gaps also show up in OCS review data. In a recent analysis of roughly 11,000 comparative estimates, a bit over one-fifth of reduced dollars were attributed to documentation gaps rather than an identified disagreement about price*. That finding covers comparative estimates generally, not supplements alone, and does not show that every reduction could have been avoided; but it’s a strong reminder that you should always work to make the evidence easy to evaluate.

Document the Discovery

Start documenting as soon as an additional condition is found. Take an overview photo that establishes the room and affected area, then closer images showing the condition and materials. When feasible, photograph materials before removal and continue documenting as the work progresses. Label images with the date, room, and a short description.

For water-related work, record moisture readings when they help explain the condition or support the requested scope. Include the date, location, material, and reading, and connect each entry to a field note or moisture map when available. If demolition exposes a concealed area, note when access was created and what was observed.

Your moisture readings are especially important. During structural drying, restorers should:

• Record and monitor relevant moisture measurements daily, preferably at about the same time each day, until the drying goals are achieved
• Document readings for affected materials using the appropriate meter and scale, compare them with a suitable dry standard, and record relevant psychrometric conditions, such as temperature and relative humidity, with GPP where used
• Note equipment operation or adjustments and work progress as applicable
• Avoid applying a single “3 to 4 percentage point” tolerance to every material, as drying goals are specific to the materials and assembly

Pair the records with a short before-and-after narrative: what was visible during the initial inspection, what became visible after materials were opened, and what additional work is being requested. For example: “After the lower wall in the north bedroom was opened, wet insulation was observed behind the drywall. Photos 12–16 document the exposed cavity, and the room log records associated readings. The requested additional removal is limited to that wall section.”

Match the evidence to the item. Photos can establish location and visible condition; measurements can support quantities; activity and drying logs can document recorded work and progress; test results can support applicable work.

Keep observations separate from conclusions. If the evidence suggests a condition may be pre-existing or unrelated, explain that rather than blending it into the supplement. If a measurement or image is missing, don’t imply otherwise. The insurer makes coverage and payment decisions, and documentation cannot guarantee approval.

Communicate Promptly

Notify the carrier adjuster or assigned TPA reviewer when newly discovered conditions may change the scope. Identify the location and observed condition, describe the additional work being considered, and reference the supporting records available. You do not need to wait until every line is priced to give initial notice; follow up with the revised estimate and itemized support.

If a restoration program or TPA agreement applies, check its notice and approval requirements before added work proceeds, when circumstances allow. If work cannot reasonably wait to protect the property, document what was necessary and why prior review was not feasible.

Keep the homeowner informed, too. Explain that opening materials can reveal conditions that were not visible at first, that the scope and estimated cost may change, and that additional work remains subject to review. Avoid promising that insurance will cover it. We covered how to set expectations early in our post on preventing customer price shock.

Make Every Line Item Traceable

For each added or revised line item, identify the task, location, quantity, unit, and documented basis for including it in the requested scope. Tie that basis to a photo, reading, field note, work authorization, change order, or other relevant record. When a quantity is based on dimensions or affected area, include the measurements and calculation.

Keep new work distinct from what the original estimate already included. Use consistent room names and units across the estimate and supporting records. If a lump sum is necessary, include a breakdown of what it covers. A short cross-reference list showing the line item, location, reason, and supporting document can help expose gaps before submission.

Before sending, compare the supplement with the original estimate and field records. Check that each change has a documented basis, quantities agree with measurements, and previously billed work is not repeated.

Build a Review-Ready Package

Organize the packet in review order: a concise discovery narrative, a revised estimate with changes identified, then labeled photos, measurements, and supporting records. Use consistent room names and dates, and make the changes easy to locate rather than burying them in a replacement total. The carrier adjuster or TPA reviewer should be able to trace each request from discovery to work item to supporting evidence.

At OCS, we help contractors organize the discovery record, revised estimate, and supporting documents into a supplement package, then support the file through review as part of managing the full claim. For more practical claims insight, subscribe to Claims Corner.

*Methodology note: The figure comes from OCS’s September 11, 2026 analysis of roughly 11,000 comparative estimates mined over the trailing two years. “Documentation gaps” reflects OCS’s internal classification of review responses, not statements by any carrier. The figure is rounded and directional.