The Insurance Supplement Process, Explained Step by Step

Almost no first-issued insurance estimate covers the full job. That is not fraud on the carrier''s part — the adjuster spent 30 minutes on a house and priced from a software template. The supplement is the built-in correction mechanism. Here is how it runs.

What a supplement actually is

A written request to add line items, quantities, or code-required work the original scope missed, supported by photos and documentation, priced in the carrier''s own estimating software.

Step 1 — Compare the scope to the real job before starting

Your contractor reads the carrier estimate line by line against what the job actually requires. Typical gaps:

Missing item	Why it gets missed
Ice-and-water shield to code	Adjuster used a generic template
Decking replacement	Not visible until tear-off
Drip edge, starter strip, ridge vent	Priced as included when it is not
Steep or two-story access charges	Measured wrong from the ground
Detach and reset (satellite, solar, gutters)	Not on the walkthrough
Permit and dump fees	Regional line items omitted
Second layer tear-off	Discovered during removal

Step 2 — Document at the moment of discovery

Hidden-condition supplements only get approved with photos taken during the work:

• Wide shot showing the address or a landmark
• Close-up of the condition with a tape measure
• Count and location noted (e.g., "18 sheets, north slope")

Once the new decking is on, the evidence is gone. Photograph before covering anything.

Step 3 — Price it in the carrier''s software

Supplements written in a contractor''s own format get rejected or delayed. They should be submitted as a line-item estimate in the same estimating platform the carrier uses, with the same price list for your ZIP code and date of loss.

Step 4 — Cite code, not opinion

Code-driven items are the easiest approvals because they are not negotiable:

• Ice barrier requirements at eaves in cold climates
• Ventilation ratios required on a re-roof
• Fastener and underlayment requirements
• Permit requirements from your city

Attach the code section and the local permit requirement.

Step 5 — Submit and track

A complete submission includes: cover letter with claim number and date of loss, the revised estimate, the photo report, code citations, and any manufacturer letters. Send by email so there is a timestamp.

Then follow up on a schedule — most delays are simply a file sitting in a queue.

Stage	Typical timing
Supplement submitted	Day 0
Desk adjuster review	3–10 business days
Approval or questions	1–2 weeks
Revised scope issued	Within days of approval
Payment	With final depreciation release

Step 6 — If it is denied or partially approved

Ask for the specific reason per line item in writing. Then respond to each with evidence. If the disagreement is only about price, the policy appraisal clause exists for exactly that.

What you should pay

Nothing extra. A supplement raises what the carrier pays so the correct job gets built. Your out-of-pocket stays the deductible plus any upgrades you chose. A contractor who says "insurance won''t cover that, so pay me cash for it" without first submitting a supplement is skipping the step you hired them for.

Red flags

• Contractor never submits a supplement on a full roof or full-elevation job
• Contractor asks you to sign a blank or open-ended assignment of benefits
• Contractor offers to "eat" the deductible — illegal in Minnesota
• Work starts before hidden conditions are documented

We write supplements in carrier software with photo reports and code citations on every claim job.