A dollar adjustment is generally preferred over a percentage adjustment when:
Correct Answer
B) The feature's value does not scale with the property's price
Why this is correct: A dollar adjustment is preferred when the value of a feature (like a fireplace or pool) is relatively fixed and does not scale proportionally with the overall property price. Why the other choices are wrong: A rapidly appreciating market or a sale older than a year typically calls for a percentage adjustment for market conditions. A subject substantially larger than comparables might also use percentage adjustments for size. Exam tip: Use dollar adjustments for features with a fairly constant cost/value; use percentages for factors that scale with price (time, location).
Why This Is the Correct Answer
Option B states the test directly: use a dollar adjustment when the feature's value does not scale with the property's price. A single-car garage adds roughly the same contributory amount across a range of similar homes, so expressing it as a percentage would overstate the adjustment on expensive comparables and understate it on cheap ones. The form of the adjustment should mirror the economic behavior the market actually displays, and paired sales across a price range will reveal which pattern holds. That is the entire decision rule.
Why the Other Options Are Wrong
Option A: The market is appreciating rapidly
A rapidly appreciating market is the classic case for a percentage adjustment, because appreciation is observed and quoted as a rate and applies proportionally across price points. A fixed dollar market-conditions adjustment would misstate the change on every comparable that is not near the subject's price. This option inverts the rule it is testing.
Option C: The comparable sold more than a year ago
A sale more than a year old primarily needs a market-conditions adjustment, which is again derived and applied as a rate per month or per year and compounds over the elapsed time. Age of the sale tells you an adjustment is needed and how large the interval is, but it says nothing about whether a feature's value scales with price. Recency is the wrong variable for this decision.
Option D: The subject is substantially larger than the comparables
A large size difference is usually handled with a rate per square foot of gross living area or, in some markets, a percentage, and neither is a fixed dollar amount. More importantly, a substantial size difference is a warning that the comparable may be weak and that better-bracketed sales should be sought. Size adjustments also tend to be nonlinear, since contributory value per square foot declines as size increases.
Percent for Price, Dollars for Things
Percent for price, dollars for things. Anything that moves with the whole property, time on the market and location, gets a percentage. Anything you could point at and count, a fireplace, a bath, a garage bay, gets a dollar amount. If you can put it in a wheelbarrow, price it in dollars.
How to use: Before choosing a form, ask whether the difference would be worth twice as much in a house worth twice as much. If yes, use a percentage; if no, use dollars. Then check that transactional adjustments, which are almost always percentages, are applied in sequence before the physical dollar adjustments.
Exam Tip
Watch for options that pair the adjustment form with market conditions or elapsed time; those situations call for percentages, so they can be eliminated in any question asking when dollars are preferred.
Common Mistakes to Avoid
- -Expressing an amenity adjustment as a percentage so it inflates on the highest-priced comparable
- -Applying market-conditions adjustments as flat dollar amounts across comparables at different price points
- -Applying percentage adjustments out of sequence so that later percentages compound on an already adjusted base incorrectly
Concept Deep Dive
Analysis
This question tests how to choose the form of an adjustment in the sales comparison approach. The choice between a dollar amount and a percentage is not stylistic; it is a claim about how the market prices the difference. A percentage adjustment asserts that the value effect scales with the price of the property, which is true of market conditions over time, of location, and of many quality and condition differences, since a rising market lifts a $400,000 house and an $800,000 house by roughly the same proportion rather than the same number of dollars. A dollar adjustment asserts the opposite, that the effect is roughly constant in absolute terms regardless of the property's price, which fits discrete components such as a fireplace, a garage bay, a bath, or a paved driveway. Getting the form wrong distorts adjustments most severely on the comparables furthest in price from the subject, which are precisely the ones already carrying the most uncertainty.
Background Knowledge
You need to know the standard sequence of adjustments, with transactional elements such as property rights, financing, conditions of sale, expenditures immediately after purchase, and market conditions applied first and in order, followed by property elements such as location, physical characteristics, and amenities. You also need to know that adjustments are derived from paired sales, sensitivity analysis, cost with market support, or regression, and that the derivation should show whether the effect is proportional or fixed.
Real-World Application
Adjusting four comparables ranging from $385,000 to $520,000, an appraiser applies a 0.4 percent per month market-conditions adjustment to each, then a flat $6,500 for a second full bath derived from paired sales that held across the price range, deliberately keeping the bath adjustment constant rather than scaling it with each comparable's price.
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