What is a supplemental claim, and how do I file one?

Tygart Media · Insurance Claims Guides · Estimates & payments

Why supplements exist

The adjuster’s first estimate is written from a single visit, before any demolition. But real repairs reveal real surprises: rotted framing behind the drywall, wiring that no longer meets code, flooring that can’t be matched and must be replaced as a continuous run. None of that was visible on day one — so none of it is in the first check. The supplement is the mechanism for getting it covered. It’s a normal part of the process, not a confrontation.

What qualifies

• Hidden damage discovered during repairs — what the walls were hiding.
• Code upgrades required by your local building department to complete the repair legally (permits, electrical, plumbing).
• Price differences — materials or labor that genuinely cost more than the estimating software allowed.
• Scope corrections — line items the first estimate missed entirely.

What doesn’t qualify: upgrades you simply want (nicer tile, a better fixture than what was damaged) — the policy owes you restoration to pre-loss condition, not a remodel.

How to file one

1. Stop and document when additional damage is found. Photos, measurements, and a written description before anything gets covered back up.
2. Have your contractor write the supplement as a line-item document: each additional item, its cost, and why it’s necessary (code section, photo reference, manufacturer spec). A supplement that explains itself gets approved faster than one that just lists numbers.
3. Submit it in writing to the adjuster — email with the supplement and photos attached. Ask for written approval.
4. Get approval before the work is done whenever possible. It’s far easier to get a supplement approved for work the adjuster can still inspect than for work that’s already behind new drywall.
5. Follow up on a schedule. Supplements sit in queues. A polite weekly check-in keeps yours moving.

What a supplement can cover