What Is a Roofing Supplement?

A roofing supplement is a request to the insurance carrier for additional payment on line items the original adjuster’s estimate missed or underpriced. Typical recovery runs $3,000–$15,000 per claim, averaging $7,000–8,000 on a residential roof.

The gap exists because the first estimate is usually written fast — a walk-around inspection, a standard set of Xactimate line items, and a scope that matches what’s visible from the ground. Code requirements, hidden decking damage, and flashing details that only show up once the old roof comes off don’t make it onto that first estimate. A supplement is the formal correction to that scope, submitted after the fact with the documentation to back it up.

How does the supplement process work?

1. The adjuster writes the initial estimate. This happens early, usually before tear-off, based on a visual inspection and standard pricing software.
2. The scope gets reviewed against the actual roof. Once tear-off starts, or once someone who knows what to look for reviews the estimate line by line, missing or underpriced items get identified.
3. A supplement request is submitted. This includes the specific line items, the code citations or manufacturer requirements behind them, and photo documentation.
4. The carrier reviews it. They can approve it, deny it, or negotiate a partial amount — sometimes after a reinspection.
5. Approved amounts get added to the claim. The homeowner and contractor receive the difference, on top of the original payout.

Why do adjusters miss these items in the first place?

Not because anyone’s trying to shortchange the claim. The system is built in a way that makes it easy to miss things, not because someone’s actively hiding them. Adjusters carry heavy caseloads and inspect from the ground or a quick walk of the roof; they’re not roofers, and they’re not expected to know every local code update. Estimating software defaults to standard pricing unless someone manually flags the exceptions. Nobody teaches Xactimate line items to roofing contractors, and the carrier has no incentive to volunteer a bigger number than the software generates. The result is a scope that’s technically defensible and quietly short.

What does it cost to get a supplement written?

There’s no single answer — it depends on who does the work:

Option	Typical cost
Outsourced supplement service	8–15% of the recovered amount, or $150–500 flat per submission
Retainer-based supplement service	$500–2,500/month
In-house supplement specialist	$45,000–75,000/year salary

Most contractors doing volume after a storm find the retainer or per-submission model works out cheaper than a full-time hire, at least until the claim volume justifies it.

Frequently asked questions

Frequently asked questions

Is a supplement the same as a change order?+−

No. A change order covers work added after the job starts, usually agreed directly with the homeowner. A supplement corrects the insurance scope itself — it's a request back to the carrier, not an addition to the contract.

Do I need a public adjuster to file a supplement?+−

No. Contractors file supplements directly with carriers all the time. A public adjuster is a separate, licensed role that represents the homeowner's interests broadly — useful in disputed claims, but not a requirement for a standard supplement request.

How long does a supplement take to get approved?+−

It varies by carrier, but a well-documented supplement with clear code citations and photos typically gets a response in one to three weeks. Thin documentation or a busy adjuster can push that longer.

Can a supplement get denied?+−

Yes. Carriers deny supplements that lack documentation, or where the line item is genuinely not covered by the policy or code. A denial isn't always final — reinspection requests and appraisal clauses exist for exactly this situation.