An appraiser adjusts a comparable for a 200-square-foot garage addition using a $45/sf adjustment rate. The subject has no garage. The appraiser applies the adjustment as −$9,000 to the comparable’s sale price. Later, the appraiser discovers that the garage contributed only $32/sf in the local market based on paired sales analysis. What is the correct treatment of this error under USPAP Standards Rule 1-4?
Correct Answer
A) The appraiser must revise the report to reflect the $6,400 adjustment and disclose the correction in an addendum.
Standards Rule 1-4 requires that adjustments be supported by market data and applied in a manner that reflects the market's reaction to the feature. When new evidence (e.g., paired sales indicating $32/sf) contradicts the originally applied rate, the appraiser must revise the analysis to reflect the best available market-supported data. Retaining an unsupported adjustment violates SR 1-4(a), which mandates that adjustments be 'based on market data.' Disclosure alone is insufficient — correction is required. Options B, C, and D misstate USPAP: consistency does not override market support (B), USPAP imposes no universal gross adjustment limit (C), and materiality thresholds are not defined by percentage-value impact in SR 1-4 (D).
Why This Is the Correct Answer
Option A is correct because it applies the market-derived rate, producing a $6,400 adjustment, and discloses the correction. Both parts matter: the analysis must change to reflect the best available evidence, and the reader must be able to see that it changed and why. Using $32 per square foot ties the adjustment to observed buyer behavior, which is the requirement. Leaving the original figure in place while merely noting the discrepancy would communicate a value the appraiser knows is not supported.
Why the Other Options Are Wrong
Option B: The appraiser may retain the original $9,000 adjustment because it was applied consistently across all comparables.
Consistency across comparables is a real virtue, but consistently applying an unsupported rate simply spreads the same error through every line of the grid rather than curing it. The test for an adjustment is market support, not internal uniformity. An appraiser who defends a figure on consistency grounds has substituted a procedural argument for an evidentiary one.
Option C: The appraiser should apply a gross adjustment limit of ±10% to the $9,000 and accept $8,100 as acceptable.
USPAP imposes no universal gross adjustment limit, and the ten percent figure here is invented. Lenders and agencies do publish guidelines on total gross and net adjustments that trigger commentary or additional support, but those are client requirements rather than standards, and none of them work by trimming an adjustment toward an acceptable number. Adjusting a figure to fit a threshold rather than to fit the market inverts the entire process.
Option D: The appraiser need not correct it unless the error changes the final value opinion by more than 5%.
No percentage materiality threshold excuses an appraiser from correcting a known unsupported adjustment. The relevant concept is whether an error is substantial and significantly affects the results, which is a judgment about the assignment rather than a fixed five percent trigger. Waiting to see whether the error is large enough also misstates the duty, since the appraiser already knows the applied rate lacks support.
Better Evidence Wins
When better evidence arrives, the better evidence wins. Not the rate you used last time, not the rate you used on the other comps, not a rate trimmed to fit a guideline. Paired sales said thirty-two dollars, so the adjustment is thirty-two times the square feet, and you say in the report that you changed it.
How to use: When a stem supplies both an applied rate and a market-derived rate, recompute with the market figure and choose the option matching that result. Reject options invoking consistency, a percentage cap, or a materiality threshold, since none of those is a substitute for market support. Confirm the option also addresses disclosure.
Exam Tip
Learn to recognize invented thresholds; specific percentages attached to USPAP obligations are almost always fabricated distractors, since the standards speak in terms of credibility and substantial error.
Common Mistakes to Avoid
- -Carrying an adjustment rate forward from a prior assignment without re-deriving it
- -Defending an unsupported adjustment on the grounds that it was applied consistently
- -Trimming an adjustment to satisfy a lender's gross adjustment guideline rather than the market evidence
Concept Deep Dive
Analysis
This question tests the obligation to use market-supported adjustments and what happens when better evidence contradicts a figure already applied. Standard 1 governs development of a real property appraisal and requires the appraiser to analyze the comparable sales data available and to reach conclusions supported by that analysis, which means every adjustment must reflect the market's own reaction to the feature rather than a rate carried in from habit, from a cost figure, or from a prior assignment. The paired sales analysis here produced $32 per square foot, and 200 square feet at that rate is $6,400 rather than the $9,000 originally deducted. Once the appraiser knows the supported rate, continuing to use the unsupported one would be a substantial error affecting the results. Correction means revising the analysis and the report, not merely adding a note, because the value indication itself changes. If the report has already been delivered, the appraiser should issue a corrected report and communicate the change to the client, since intended users are relying on a figure the appraiser now knows to be unsupported.
Background Knowledge
You need to know that Standard 1 requires analysis of available comparable sales data with conclusions supported by that analysis, and that adjustments must be derived from market evidence through paired sales, sensitivity analysis, regression, or cost with market support. You should also know that USPAP prohibits committing a substantial error of omission or commission that significantly affects an appraisal, and that lender adjustment guidelines are client requirements rather than standards.
Real-World Application
After delivering a report, an appraiser completes additional paired sales work showing garage space contributes $32 rather than $45 per square foot. The appraiser recomputes each affected comparable, finds the value indication shifts by about $4,000, issues a corrected report to the client, and documents the revised derivation in the workfile.
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