Best Supplement Companies for Roofing Contractors (2026)

A supplement company reviews insurance adjuster estimates, identifies missed or underpaid line items, and writes supplemental estimates in Xactimate to submit to the carrier for additional payment. Most supplement companies charge 8% to 15% of the approved supplement value. The right company for your business depends on your claim volume, trade mix, and whether you need roofing-specific or multi-trade expertise.

Adjuster estimates routinely miss scope, undercount quantities, or skip legitimate items. That is not necessarily the adjuster's fault - they are processing dozens of claims and spend limited time on each roof. But the gap between what the adjuster scoped and what the job actually costs is real, and supplement companies exist to close that gap.

What Supplement Companies Actually Do

The supplement process follows a consistent pattern:

1. You send the supplement company the adjuster's estimate (usually a PDF or ESX file) along with your photos and documentation
2. Their estimator reviews the scope against the actual damage documented
3. They identify missed line items, underpaid items, and scope gaps
4. They write a supplemental estimate in Xactimate with the additional items
5. They submit the supplement to the carrier
6. They handle the back-and-forth with the adjuster or carrier examiner
7. The carrier approves (or partially approves) the supplement and issues additional payment

How to Evaluate a Supplement Company

There is no ranked list of "best" supplement companies because the right company depends on your market, your volume, and your type of work. Instead, here is what to evaluate:

Xactimate Expertise

The supplement lives and dies in Xactimate. Ask about their estimators' experience levels. How long have they been writing supplements? Are they Xactimate certified? Do they stay current with Verisk's pricing updates and category changes?

Trade Specialization

Some supplement companies specialize in roofing. Others handle multi-trade claims including siding, gutters, interior, and water mitigation. Make sure their expertise matches your work. A company that mostly supplements interior water damage claims may not catch the roofing-specific items you need.

Communication Process

You need to know what is happening with your claims. Ask how they keep you updated. Do you get a portal? Email updates? A dedicated account manager? The worst experience is sending a file and hearing nothing for weeks.

Fee Structure

Most supplement companies charge a percentage of the recovered amount. Typical ranges are 8-15%. Understand exactly when you owe them money. Is it when the supplement is approved, or when the carrier actually pays? Is there a fee if the supplement is denied? Get this in writing.

Volume and Turnaround

If you are sending 20+ supplements per month, you need a company that can handle that volume without delays. Ask about their current turnaround times and capacity. A company that is right for 5 supplements per month may not be right for 50.

Common Supplement Items on Roofing Claims

These are line items that adjusters frequently miss or underprice:

Category	Commonly Missed Items
Roofing	Drip edge, starter strip, pipe boot replacements, ridge vent, ice and water shield in valleys
Gutters	Gutter re-hang, gutter screens, downspout re-attach, gutter apron
Siding	Siding that cannot be matched (requires full-side replacement), house wrap behind replaced siding
Interior	Drywall repairs from roof leaks, painting after drywall work, baseboard removal and reset
O&P	Overhead and profit when three or more trades are involved (the three-trade rule)
Code upgrades	Items required by current building code that were not on the original structure

Should You Build an In-House Supplement Team?

At a certain volume, it makes financial sense to bring supplementing in-house. The break-even depends on your volume, the cost of hiring experienced estimators, and how much you are paying in supplement fees.

In-House Pros

• No percentage fees on recovered amounts
• Faster turnaround when you control the process
• Deeper knowledge of your specific jobs and documentation
• More control over the carrier relationship

In-House Cons

• Need experienced Xactimate estimators (hard to hire)
• Salary and overhead costs regardless of volume
• Training and staying current with pricing updates
• Less specialization than a dedicated supplement company

How CapOut Fits In

Whether you outsource supplements or handle them in-house, the process starts with getting the insurance PDF estimate into Xactimate. CapOut converts insurance PDFs and sends them directly to your Xactimate account, skipping the manual re-keying step. But CapOut goes beyond conversion. The same upload gives you a full profit breakdown by trade, so you can see margin before production starts. Material orders are context-aware: change the shingle brand and hip, ridge, and starter auto-switch to match. Labor orders load per crew with their pricing, and you can swap crews to see margin impact instantly. When an adjuster denies a line item, the AI claim assistant writes a documented, cited response from 50,000+ adjuster emails, manufacturer specs, and building codes. This speeds up intake, production planning, and supplement support for both outsourced and in-house teams. Free to start with 300 tokens, no credit card required.

The Bottom Line

A good supplement company recovers money you would otherwise leave on the table. The right one depends on your volume, your trade mix, and your communication expectations. Evaluate based on Xactimate expertise, specialization, communication, and fee transparency. And regardless of whether you outsource or build in-house, cut the intake time by converting PDFs to ESX files before anyone starts reviewing scope.