When estimating adjustments based on the cost of a feature or item, what is necessary?

• A. Assuming cost equals value
• B. Careful analysis of the relationship between cost and value is necessary
• C. Ignoring cost data
• D. Using only replacement cost

Answer: (B)

When adjusting for a feature, you must translate what the feature costs into what buyers actually value in the market. The market doesn’t always assign value equal to the cost to install or replace a feature, so you can’t assume cost equals value. A careful analysis of the relationship between cost and value is necessary, taking into account how the feature affects utility, market demand, and any depreciation or obsolescence. Use market evidence and comparable sales to see how buyers value the feature, rather than relying on cost data alone. Replacing cost can inform adjustments, but it doesn’t by itself capture how the market values the feature.