How do I get a diminished value appraisal?

We provide the comparable sales data that appraisers need to support diminished value claims. While we don't provide appraisals ourselves, our auction database gives you access to real market evidence from Bring a Trailer, Cars & Bids, Hagerty, PCAR Market, All Collector Cars, Gooding & Co, and RM Sotheby's. Use this data with a licensed appraiser to support your claim.

Why do I need comparable sales data for a diminished value claim?

Insurance companies require evidence of market value. Comparable sales data shows what similar vehicles have actually sold for at auction, providing objective proof of your vehicle's pre-accident value. This data is essential for appraisers to calculate accurate diminished value.

How do I use Old Cars Data to support a local appraiser?

Old Cars Data provides the market evidence appraisers need. Access our database through our API or MCP server to find comparable sales for your specific make, model, year, and condition. Share this data with your appraiser to strengthen your diminished value claim with real auction results.

What auction sources are included in your database?

We aggregate data from Bring a Trailer, Cars & Bids, Hagerty, PCAR Market, All Collector Cars, Gooding & Co, and RM Sotheby's. Our database includes over 275,000 auction results with real transaction prices, dates, mileage, and condition details.

How often is the auction data updated?

Our database updates daily with new auction results. We track completed sales continuously to ensure you have access to the most current market data for your diminished value claim.

What time period does your data cover?

Our auction database covers sales from 2018 to the present, providing comprehensive historical data for establishing market trends and comparable values.

How do I access the comparable sales data?

You can access our data through our REST API for programmatic access or via our MCP server for AI tool integration. Free tier available for basic access.

Can I use this data for insurance claims?

Yes, our comparable sales data is designed to support insurance claims, including diminished value claims. However, you should work with a licensed appraiser who can properly interpret and present this data to insurance companies.

Old Cars Data / Market ReferenceDiminished value comps

Diminished value comps

Diminished Value Appraisal: Real Auction Data for Claims

Q: Is this legal or appraisal advice?

No. Old Cars Data provides market data only. This information is not legal advice, appraisal advice, or insurance advice. Always consult with licensed professionals (appraisers, attorneys, insurance experts) when filing a diminished value claim.

Support your diminished value claim with completed auction comps from seven major platforms. Appraisers need evidence. Old Cars Data gives them normalized market records.

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275k+

completed sales

auction sources

MCP + API

access layer

275,000 Auction Sales

Completed sales, not listing estimates

Updated Daily

Yesterday's auction activity available today

Seven Sources

BaT, Cars & Bids, Hagerty, PCAR, Gooding, and more

Summarize this page with:

What is Diminished Value?

Diminished value is the reduction in a vehicle's market value after it has been damaged and repaired, even if repairs restore it to pre-accident condition. When your vehicle is involved in an accident, its resale value decreases because it now has an accident history. Insurance companies may owe you compensation for this lost value.

To successfully claim diminished value, you need evidence of your vehicle's pre-accident market value. This is where comparable sales data becomes essential—it shows what similar vehicles have actually sold for, providing objective proof for your claim.

Why Comparable Sales Matter

Insurance companies require objective evidence when evaluating diminished value claims. Comparable sales data from real auctions provides this evidence by showing:

Actual transaction prices for vehicles matching your make, model, year, and condition
Market trends and how values change over time
Price ranges that reflect condition, mileage, and provenance
Real-world data that appraisers can use to calculate accurate diminished value

Without comparable sales data, appraisers must rely on estimates or general market averages, which often undervalue your claim. Real auction data strengthens your position with concrete evidence.

Comparable Sales — No Code

Ask ChatGPT or Claude for comparable sales in plain English via our MCP server. Built for appraisers and analysts.

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Using Old Cars Data to Support a Local Appraiser

We Provide Evidence, Not Appraisals

Old Cars Data provides the market evidence that appraisers need to support diminished value claims. We do not provide appraisals, legal advice, or insurance advice. Our role is to give you access to real auction data that licensed appraisers can use to calculate accurate diminished value.

When filing a diminished value claim, work with a licensed appraiser in your area. Share our comparable sales data with them to:

Establish your vehicle's pre-accident market value using recent auction sales
Provide objective evidence that strengthens your claim
Show market trends and price ranges for similar vehicles
Support the appraiser's calculations with real transaction data

Our database covers over 275,000 auction sales from major platforms, giving appraisers comprehensive data to work with. Access the data through our API or MCP server—whichever method works best for your appraiser.

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RECOMMENDED

ChatGPT & Claude

Query auction data in plain English via MCP. No coding required. Perfect for appraisers and analysts.

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REST API

Programmatic access to auction data. Perfect for developers and automated workflows.

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Create a free account to access comparable sales data. No credit card required.

Data Coverage & Updates

Coverage: 2018 to present
Update Frequency: Daily
Sources: Bring a Trailer, Cars & Bids, Hagerty, PCAR Market, All Collector Cars, Gooding & Co, and RM Sotheby's
Total Records: Over 275,000 auction sales

Diminished Value Data by Model

Access comparable sales data for these popular models. Each page includes model-specific insights, recent auction sales, and market context to support your diminished value claim.

Frequently Asked
Questions

Free tier availableNo code • Plain English

Ask AI for comps that support your claim

“Show me recent auction sales for my make and model” — answers backed by real hammer prices.

Same dataset appraisers use: seven platforms, normalized schema, daily updates. Connect ChatGPT or Claude via MCP in minutes.

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What comps do I need for diminished value?

Here are recent auction results matching your vehicle's make, model, and era...

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Trust & Transparency

Disclaimer

Old Cars Data provides market data only. This information is not legal advice, appraisal advice, or insurance advice. Always consult with licensed professionals (appraisers, attorneys, insurance experts) when filing a diminished value claim.

Data Sources

Our auction data is sourced from Bring a Trailer, Cars & Bids, Hagerty, PCAR Market, All Collector Cars, Gooding & Co, and RM Sotheby's. All data represents actual completed sales, not estimates or listings.

Attribution

Reviewed by Old Cars Data market data team. Data is updated daily and verified against source platforms.