Why Adjustment Support Matters More Than Ever
Why Adjustment Support Matters More Than Ever
By Timothy J. Hansen, RPRA, MNAA
Article 1 of 9 | The Adjustment Series | Blue Ridge Valuation Services LLC
If you have been appraising for more than a few years, you have probably felt the shift. Clients push back harder. Reviewers ask more pointed questions. Attorneys in litigation want to know exactly how you arrived at that $15,000 location adjustment. The phrase "in my professional judgment" is not landing the way it used to.
That pressure is not going away. It is growing. And understanding why and what to do about it is the purpose of this series.
This first article sets the stage. We will look at why the stakes around adjustment support have changed, what "support" actually means in practice, and why now is the right time for every appraiser to take a hard look at how they develop and document their adjustments.
The Landscape Has Changed
Appraisal practice has always required judgment. But judgment without documentation has become an increasingly difficult position to defend. Several forces have converged in recent years to raise the bar for what constitutes adequate adjustment support, and appraisers who are not aware of them are operating at a disadvantage.
Market Volatility
Markets across the country have swung dramatically in the past several years. Rapid appreciation in 2021 and 2022, followed by the impact of sharply rising interest rates in 2023 and 2024, created conditions in which comparable sales from even six months ago may reflect a meaningfully different market. In that environment, adjustments, and particularly time or market conditions adjustments, carry more weight than they do in stable market conditions. An adjustment that might have sailed through review in a flat market can become a central point of dispute when market conditions are rapidly moving.
At the same time, buyers and sellers in volatile markets often behave in ways that complicate comparable selection and adjustment. Motivated sellers, cash buyers, and properties with unusual financing terms all introduce noise into the data. Identifying and adjusting for those factors requires a level of analytical rigor that goes beyond routine grid completion.
Regulatory and Oversight Scrutiny
Fair lending concerns, valuation bias issues, and heightened agency oversight have all put appraisal methodology under a brighter spotlight. Federal banking regulators, the GSEs, and state appraisal boards have all increased their attention to the quality and consistency of appraisal work. Adjustments that appear arbitrary, inconsistent, or unsupported draw attention in ways they did not a decade ago.
This is not simply a compliance issue. It reflects a broader expectation that appraisal conclusions be traceable to market evidence. When regulators or auditors examine a report and cannot identify the basis for a significant adjustment, that is not a paperwork problem, it is a credibility problem.
Litigation and Adversarial Review
In eminent domain, divorce, estate, commercial, and tax appeal proceedings, appraisers routinely face cross-examination by opposing experts and attorneys. The adjustment section of a sales comparison grid is fertile ground for challenge. Every number is fair game.
Appraisers who have developed and documented their adjustments rigorously are well-positioned in that environment. Those who have relied on rules of thumb, borrowed adjustments from prior assignments, or simply made educated guesses without documentation are exposed. The difference between a defensible adjustment and an indefensible one is rarely the size of the adjustment, it is the level of support.
The Rise of Automated Valuation Models
Automated valuation models (AVMs) are increasingly used as benchmarks by lenders, agencies, and reviewers. When a human appraisal conclusion diverges significantly from an AVM estimate, questions follow. Those questions are not always fair. AVMs have well-documented limitations and do not replace the judgment of a competent appraiser, but they are real, and appraisers need to be prepared to answer them.
A well-documented adjustment methodology is one of the most effective tools for explaining a divergence from an AVM. When you can show exactly how you measured and adjusted for the characteristics that drive value in a specific market, the difference between your conclusion and a model's estimate becomes explicable rather than suspicious.
What "Support" Actually Means
There is a common misconception in some areas of the appraisal profession that supporting an adjustment means producing a spreadsheet or running a regression model. That is not necessarily true. The standard is not methodological, it is evidentiary.
An adjustment is supported when a knowledgeable reviewer can look at your work and understand three things: where the adjustment came from, what market evidence backs it up, and why it is reasonable given the characteristics of the subject and the comparables.
Supporting your adjustments is not about over-engineering every report. It is about being able to articulate why you made the adjustments you did, what market evidence supports them, and how a reviewer or court should think about them.
That support can take many forms. Paired sales analysis, grouped market data, regression analysis, cost-based reasoning, and well-documented qualitative analysis can all satisfy the standard, depending on the circumstances. The method matters less than whether it is credible, reproducible, and tied to actual market behavior.
What does not satisfy the standard, under any circumstances, is silence. An adjustment grid with numbers and no explanation of where those numbers came from is not a supported adjustment. It is an assertion. And assertions, however confidently made, are not likely to hold up under serious review.
USPAP and the Credibility Standard
USPAP does not prescribe a specific method for supporting adjustments. It does not require paired sales, regression, or any particular technique. What it does require in Standards Rules 1-1, 1-4, and the broader credibility standard is that adjustments reflect market behavior and that the analysis behind them be documented in a way that is meaningful to the reader.
Standards Rule 2 adds that the report must contain sufficient information for the intended user to understand the appraiser's reasoning. That means the support is not just something you do and keep in your workfile, it needs to be communicated in the report itself. More on this in Article 2, which takes a deeper look at exactly what USPAP requires.
The Yellow Book Context
For appraisers working in federal acquisition and eminent domain, the Uniform Appraisal Standards for Federal Land Acquisitions, UASFLA or the Yellow Book, establishes a higher-resolution version of the same standard. It places particular emphasis on market-derived adjustments and clear communication of methodology to a non-appraiser audience. Article 3 addresses the Yellow Book in detail, but the core principle is consistent with USPAP: show your work and make it understandable.
Why This Matters Right Now
The appraisal profession is at an inflection point. Technology, regulatory attention, and market complexity have all raised expectations for the quality and transparency of appraisal work. At the same time, the fundamental analytical skills needed to meet those expectations, the ability to extract adjustment indicators from market data and communicate them clearly, are exactly the skills that separate good appraisers from great ones.
This series is designed to close the gap between what appraisers know they should do and what they actually do when time is short, data is thin, and the comparable grid needs to get done. Each article focuses on a specific tool or context, with practical guidance on how to use it and how to avoid the most common mistakes.
Here is what the series covers:
Article 2: What USPAP Requires for Adjustments
Article 3: What the Yellow Book Adds — and Why It's Different
Article 4: Qualitative vs. Quantitative Adjustments — Different Tools, Not Different Standards
Article 5: Paired Sales — Powerful but Often Misapplied
Article 6: Grouped Data and Market Extraction Methods
Article 7: Regression — Helpful Tool or False Precision?
Article 8: Supporting Time Adjustments in Changing Markets
Article 9: Adjustments in Partial Takings and Complex Assignments
Each article is designed to stand alone, so you can read them in any order based on what is most relevant to your practice. Read as a series, they build a comprehensive framework for adjustment methodology that works across property types, market conditions, and assignment contexts.
The Bottom Line
Supporting your adjustments well is not about doing more work for its own sake. It is about doing the right work. Doing the work that connects your conclusion to market evidence in a way that is transparent, reproducible, and defensible.
Markets change. Scrutiny increases. Expectations evolve. The appraisers who thrive in that environment are the ones who have built the analytical habits and documentation practices that hold up under pressure.
That is what this series is about. We hope you will follow along.
About Blue Ridge Valuation Services LLC
Blue Ridge Valuation Services LLC provides appraisal consulting, litigation support, expert witness services, and appraisal review for complex assignments. Principal Timothy J. Hansen, RPRA, MNAA brings more than 25 years of federal land acquisition experience, including service as Director of the Appraisal and Valuation Services Office within the U.S. Department of the Interior and as a named contributor to the 6th Edition of the Yellow Book.
Visit us at BlueRidgeValuationServices.com to learn more or schedule a consultation.
