Originally published in the April 28, 2026, issue of AI’s Appraisal Now
Reprinted with permission from AI

The MISMO AVM Common Confidence Score (CCS) is a proposed industry standard for describing how much “confidence” an Automated Valuation Model (AVM) has in its value estimate for a specific property. In plain terms, CCS is meant to make confidence scores comparable across vendors, so a “75” (or whatever scale is used) means the same general level of reliability irrespective of who produced the AVM.

CCS does not change the underlying math, data, or accuracy of any vendor’s AVM. It standardizes the way confidence is communicated, creating a common language for risk and reliability. A higher score generally means the AVM is working with strong, recent, relevant market data and the property fits patterns the model handles well, so the result is more likely to be close to what the market would support. A lower score generally means the model has weaker support (limited or older comparable sales, mixed signals, or a property that doesn’t “look like” the model’s training data), so the result has more uncertainty.

CCS can’t solve the underlying situations that make any AVM less reliable. In thin or volatile markets, such as rural areas, low-turnover neighborhoods, or periods of change, there may not be enough strong, recent sales evidence for an AVM to lean on. Confidence can also drop for non-standard or complex properties (unique design, significant additions, atypical acreage or site influence, mixed use, or high-end custom features) because they don’t fit common patterns in the data.

Confidence is also highly dependent on the quality and timeliness of the inputs (sales, listings, and property characteristics), and standardizing the score does not improve the data itself. And while CCS standardizes how confidence is reported, vendors will still differ in their AVM methods and inputs, so the AVM value and the score are not interchangeable across products without understanding the context.

Why MISMO CCS Matters to Appraisers

In the future, you may see CCS used by lenders, AMCs, and reviewers when an AVM is part of the collateral risk process. It’s fair to ask whether this is “really” about replacing appraisals. CCS itself is not an appraisal-replacement mechanism, as it doesn’t make any AVM more accurate. What it can do is make it easier for lenders and other users to apply AVMs consistently (for example, setting clearer thresholds for when an AVM result is acceptable versus when the risk suggests escalation). In that sense, CCS may support expanded AVM use in some workflows, but it doesn’t remove the need for appraisals where property complexity, market conditions, or policy requirements call for an appraiser’s analysis and judgment.

Practical Takeaways for Appraisers

What CCS is attempting to do is help different parties talk about AVM reliability using the same terms. If a workflow flags a low CCS, it typically signals “needs a closer look,” not “the value is wrong.” In those cases, expect the lender to conduct additional due diligence (escalating reviews to a full appraisal) depending on scope and intended use.

Common questions that may be asked when CCS is referenced include: What score scale/threshold is being used and what factors drove the confidence outcome (market data depth, property complexity, data quality flags)?

CCS cannot replace professional judgment. For appraisers, continue to deploy appraisal fundamentals, focusing on market analysis, comparable selection, supporting adjustments, and strong reconciliation.