Most supplement letters get denied not because the scope is wrong but because the format makes the adjuster's job harder. After processing thousands of supplement requests, we measured the difference: letters that follow this 7-section format are approved 88% of the time on the first pass. Letters without the format hover around 47% and take 2.4× longer to close.
This guide gives you the template, the psychology behind each section, and the specific phrases that move adjusters from defensive to cooperative.
- →Adjusters approve faster when they don't have to think — give them everything in one document.
- →Lead with the claim number and a one-sentence ask, not your company history.
- →Every line item needs three things: Xactimate code, quantity, and a citation.
- →Photos belong inline with their line items, not in a separate attachment.
- →Close with a payment timeline, not a question.
Why most supplement letters fail
Adjusters carry 80–150 open claims at any time. Each touch on a file is logged and timed by their carrier's claims management system. A supplement that requires the adjuster to call you, request photos, or look up a code is automatically pushed to the bottom of the queue. A supplement that has everything they need to make a decision is processed in the next batch.
Your job is not to convince. Your job is to make approval the path of least resistance.
The 7 sections of an approvable supplement letter
Section 1: Header block
Top of page 1. Bold, easy to scan. Include: claim number, date of loss, insured name, property address, your company name and license number, and your contact info. The adjuster should be able to file this letter in the right system in under 10 seconds.
Section 2: One-sentence ask
Immediately after the header: 'Requesting supplemental approval of $X,XXX.XX for code-required and overlooked scope on the above claim.' Adjusters scan for the dollar amount before they read anything else. Put it in the first sentence.
Section 3: Itemized line items
Three columns: Xactimate code | quantity & unit | unit price & total. Group by category (code upgrades, accessories, labor, waste). No prose between line items — pure data.
| Xactimate code | Qty / unit | Unit price / total |
|---|---|---|
| RFG DRIP | 240 LF | $1.62 / $388.80 |
| RFG IWS | 8.5 SQ | $73.40 / $623.90 |
| RFG VPJ 2" | 4 EA | $48.20 / $192.80 |
Section 4: Code & spec citations
After the line items, a citation block. For each code-required line, one sentence with the source: 'RFG DRIP — IRC R905.2.8.5 requires drip edge at eaves and rakes for asphalt shingle roofs. Local jurisdiction: 2021 IRC adopted [date].'
Most municipal building departments publish the adopted code year on their website under 'Permitting' or 'Codes & Standards.' Bookmark the page for each county you work — adjusters trust a citation more when you reference the specific year their jurisdiction adopted.
Section 5: Photo log
Inline, with each photo numbered and tied to a line item. Caption format: 'Photo 3 — South elevation, failed step flashing at chimney saddle. Supports RFG FLSTP supplement of 18 LF.' Photos in a separate ZIP file get ignored.
Section 6: Polite, specific request
'Please issue a revised estimate reflecting the above supplement and an updated ACV/RCV. We are scheduled to begin tear-off [date] and would appreciate revised payment by [date + 10 business days] to avoid project delay.'
Section 7: Signature & contact
Your name, role, license number, direct phone (not the office line), and email. Make it trivial to follow up.
Copy-paste template
RE: Supplement request — Claim #________, Date of loss ____\n\nInsured: ____\nProperty: ____\n\nRequesting supplemental approval of $______ for code-required and overlooked scope on the above claim.\n\n[Itemized table]\n\n[Citations block]\n\n[Photo log]\n\nPlease issue a revised estimate by [date]. Tear-off scheduled [date].\n\n[Signature, license #, direct phone, email]
Adjuster psychology: what moves the needle
Tone: confident, not adversarial
Never write 'you missed' or 'this is required.' Write 'IRC R905.1.2 requires…' Make code the authority, not your opinion.
Specificity beats volume
A 2-page supplement with citations beats an 11-page supplement of complaints. Adjusters skim. Specificity gives them a defensible reason to approve.
Set the deadline
Naming a tear-off date triggers urgency in the adjuster's queue. A supplement without a date sits.
Common reasons supplements get denied (and the fix)
| Denial reason | Real cause | Fix |
|---|---|---|
| 'Pre-existing condition' | No code citation | Cite IRC + jurisdiction adoption year |
| 'Not in original scope' | No photo evidence | Add inline timestamped photo with caption |
| 'Above market price' | Used wrong region price list | Pull current Xactimate price list for the loss ZIP |
| 'Awaiting more info' | Adjuster needs to call you | Move all info into the letter; remove dependencies |
When to escalate
If you don't have a written response in 10 business days, send a one-paragraph follow-up referencing your state's prompt-pay statute. In Texas, Florida, Colorado, and most hail belt states, carriers have a statutory window (typically 15–30 days) to acknowledge and respond. Citing the statute moves the file.
Automating the letter
RoofGenius writes this letter for you in 60 seconds. Upload the carrier's estimate and your field photos; the AI cross-checks the scope against IRC, manufacturer specs, and 14M+ approved Xactimate items, then emits a fully-formatted PDF in this exact 7-section structure with your branding. See it in action.