Effective Age

Effective age is an appraiser's estimate of a property's age based on its current condition and utility, rather than the number of years since it was built. A well-maintained or recently renovated property may have an effective age significantly younger than its actual age, while a neglected structure may present the opposite.

In the cost approach, effective age is used alongside economic life to calculate depreciation. Because it reflects market perception of condition rather than a fixed timeline, effective age requires appraiser judgment supported by comparable market evidence — not simply a calculation derived from chronological age.

The distinction between actual and effective age carries practical weight in transactions and valuations. Significant updates to kitchens, bathrooms, mechanical systems or structural components can meaningfully reduce effective age, influencing both depreciation estimates and the overall value conclusion. Reviewers and underwriters should expect appraisers to clearly explain and support any effective age conclusion that diverges notably from actual age.