How to review a collision repair supplement

Ask what changed in the proposal

When someone calls an update a supplement, ask for the revised document and the earlier version it changes. Start with the affected operation or part rather than the new total. Give the shop an opportunity to explain the finding in ordinary language, including anything that is still being assessed.

The existing article on changing estimates explains why repair information can develop during an assessment. This guide focuses on the decision record once an update reaches you: what is newly proposed, which evidence supports it, and which response is still needed. A dated comparison keeps those questions attached to the right version.

Review five pieces of information

Use the same questions for each addition. You do not need to diagnose the vehicle yourself; the aim is to understand the proposed action well enough to discuss it and record your decision. Ask for a clearer description when a line contains an abbreviation you do not recognize.

• Finding: what condition or new information prompted this proposed change?
• Evidence: which photo, observation or assessment explains the affected area?
• Operation: what part or work is being added, removed or revised?
• Decision: what is the shop asking me to authorize, and what payment question remains?
• Timing: which next step depends on a response, a part or another appointment?

Keep your authorization identifiable

Ask the service contact to identify the document version they are discussing before you respond. Save the revised proposal and your reply together. If a phone conversation is followed by a written summary, check that the scope and amount match the conversation, and raise any discrepancy promptly.

Use separate notes for the shop's repair explanation and the insurer's payment response. If someone says an item is approved, ask which approval they mean and what is still outstanding. That small clarification helps prevent an ambiguous status update from becoming the basis of a repair or payment assumption.

BAR says a repairer must contact the customer about additional repairs and obtain authorization. Its consumer guidance allows written, oral or electronic authorization.California Bureau of Automotive Repair: Maintenance and repairs

Request a specific next update

If the revised proposal is waiting for review, record who has it, when it was sent and the question awaiting a response. Ask when the shop will next update you about vehicle status. A request for ‘the status of the supplement sent on this date’ gives the recipient a clear record to locate.

When the update is resolved, keep the final version and the associated response. At pickup, use them to understand how the final invoice relates to the authorized work. If a point remains unresolved, write it down with the agreed follow-up contact. Avoid silently treating a pending line as either paid or declined.

Questions about this step

Continue with your next question

• Deductible and payment questions before collision repair
• Repair authorization and pickup paperwork in California
• Why repair information can change an estimate
• Ask for a useful repair update

Official California references

• California Bureau of Automotive Repair: Maintenance and repairs

These guides help you prepare questions and organize repair information. Your insurer can explain your policy and claim-specific payment decisions. Contact CDI or BAR through their official websites for the consumer resources relevant to your concern.