claimsguide

Estimates & payments

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

The short answer: a supplemental claim — a "supplement" — is how you get paid for costs discovered after the first estimate: hidden damage found when walls come open, code-required upgrades, materials that cost more than the software priced. If it wasn't in the scope, it won't be paid unless you supplement it. This is where a large share of missing claim money lives, and most homeowners have never heard of it.

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.
This is where good contractors earn their keep Contractors who document supplements thoroughly — photos, code citations, clear line items — get them approved. If your contractor shrugs at the idea of writing a supplement, that's useful information about your contractor.
Don't pay out of pocket for covered extras without asking If your contractor discovers additional damage mid-job, pause and supplement first. Paying for it yourself and asking for reimbursement later is a much harder fight than getting approval up front.

Related guides

Informational only — not legal or insurance advice.

Insurance rules vary by state and by policy. Check your own policy documents and your state's insurance department, or talk to a licensed professional, before acting on a claim.