Supplement negotiation is a professional skill that most contractors learn by trial and error. The contractors who recover the most aren't necessarily the most aggressive — they're the most prepared. Here's what actually works when negotiating with insurance adjusters on roof claims.
The Adjuster's Position
Before you can negotiate effectively, you need to understand the adjuster's job. An insurance adjuster is tasked with settling claims fairly and according to policy language — not with minimizing payments, and not with maximizing them. They have caseloads of 100-300+ files, time pressure to resolve claims, and authorization limits that escalate with dollar amounts.
Adjusters are not your adversaries. They're bureaucrats with authority limits and documentation requirements. The ones who approve supplements quickly are the ones who get complete, well-supported requests that are easy to justify to their supervisor. The contractors who get the fastest, most complete approvals make the adjuster's job easier — not harder.
The Foundations of Effective Supplement Negotiation
1. Documentation before conversation
Every supplement conversation should be preceded by a written supplement letter with supporting documentation. "We noticed your scope was missing starter strip" is an informal conversation. A supplement letter with a photo of the eave edge, a citation to the manufacturer's installation requirement, the linear footage, and a specific dollar amount is a business request that can be approved in writing.
Adjusters cannot approve items that aren't documented. Even if they agree with you verbally, they need written justification to process a payment. Give it to them upfront.
2. Be specific about what you're requesting
Vague supplement requests get denied or delayed. "We need more money for materials" gives the adjuster nothing to work with. "We are requesting an additional $312 for 104 linear feet of drip edge (Xactimate code RFG EDGE at $3.00/LF) that was omitted from the original scope" is actionable.
For each supplement item: state the Xactimate line item code if you know it, the quantity, the unit price, and the total. Attach the measurement documentation and any photos that support the request.
3. Cite sources, not opinions
"We always include starter strip" is an opinion. "Starter strip is required per [Manufacturer] installation instructions, page 4, and per IRC R905.2.8.2" is a citation. Adjusters can approve documented code requirements and manufacturer specifications. They can't approve your standard practice.
Keep a folder of the most common code citations and manufacturer installation guides you reference. Copy the relevant section into your supplement letter rather than asking the adjuster to look it up.
The Supplement Call
When you do speak with an adjuster by phone, come prepared:
- Have the claim number, property address, and your supplement letter in front of you
- Know exactly what items you're requesting, the dollar amount for each, and your documentation for each
- Ask specifically: "Is there additional documentation needed to approve [specific item]?"
- If they say they'll need to review it, ask: "What's the typical timeline for a review like this, and is there anything I can provide to speed up the process?"
- Take notes on every call — who you spoke to, what was said, and what the next step is
- Confirm follow-up in writing: "Thank you for the call — just to confirm, you'll be reviewing the O&P and drip edge items and we can expect a response within [timeline]."
Handling Common Objections
"That item isn't covered under the policy."
Ask to see the specific policy language they're citing. Many items that adjusters claim aren't covered actually are, and adjusters don't always read policy language carefully. If you have access to the homeowner's policy (which you should — ask them for a copy), read the relevant sections before the conversation.
"We don't pay O&P for single-trade projects."
Most major carriers do pay O&P when you can demonstrate GC involvement. Cite the IICRC standards and your actual coordination role (managing permits, subcontractors, inspections, material coordination). If the adjuster still refuses, ask to escalate to their supervisor. O&P denial is one of the most commonly overturned supplement decisions on appeal.
"We already paid for that."
Ask them to point you to the specific line item in the scope document that covers it. Have your own scope open and compare. If they can show you a legitimate line item, acknowledge it and move on. If they can't, document the exchange and resubmit with a specific reference to the gap.
"Our Xactimate prices are the industry standard."
When your actual material costs exceed Xactimate pricing, provide invoices or supplier quotes. Market pricing arguments are most effective when you have documentation showing what you actually paid — not what you think you should get paid.
When to Escalate
Escalation is appropriate when:
- A supplement has been pending for 45+ days with no response despite follow-up
- An adjuster has denied a clearly documented, legitimate item without citing specific policy language
- The adjuster is unresponsive or hostile
- The amount in dispute is significant enough to warrant the time investment
Escalation steps: (1) Ask to speak with the adjuster's supervisor, (2) File a complaint with your state's insurance commissioner (this gets carrier attention quickly), (3) For large claims, involve a public adjuster who can negotiate on the homeowner's behalf at their own incentive.
State insurance commission complaints are a significant deterrent. Carriers are regulated, and pattern complaints about bad faith claims handling can result in regulatory action. This isn't a first step — it's a last resort — but knowing it exists gives you appropriate leverage.
What Not to Do
- Don't inflate the scope to leave room for negotiation. Submit accurate quantities. If the adjuster counters, you can defend the accuracy. If you inflated, you can't.
- Don't be adversarial in tone. Professional, documentation-focused requests get approved faster than confrontational ones.
- Don't accept verbal approvals. Get everything in writing — an email confirmation at minimum — before treating an item as approved.
- Don't ghost the follow-up. If the adjuster asks for additional documentation, provide it within 48 hours. Slow responses cost you time and can get your supplement closed as inactive.
- Don't put the homeowner in the middle. Supplement negotiation is between you and the carrier. Asking the homeowner to call their adjuster to apply pressure creates friction and rarely speeds things up.
The Long View
If you're doing volume insurance work, you'll deal with the same adjusters and the same carrier teams repeatedly. Reputation matters. Adjusters who know you submit accurate, well-documented supplements — not inflated ones, not ones with made-up items — approve your requests faster because they trust you. The relationships you build with adjuster teams are a long-term business asset.
Further Reading
- Roofing Insurance Supplements: The Complete Contractor's Guide — Full workflow from inspection through final payment
- Insurance Supplement Items Adjusters Miss — The specific line items to negotiate for on every claim
- Xactimate for Roofers — Understanding the software adjusters use helps you negotiate more precisely