Casa Academy

Reviewed by Casa Academy and updated July 29, 2026 using the current DBPR checklist and Pearson VUE scheduling guidance.

Functional Obsolescence

Functional obsolescence is loss in property value caused by outdated design, layout, or systems within the structure itself, such as poor floor plans or obsolete plumbing, distinct from external economic obsolescence or ordinary physical wear.

Exam context

Select functional obsolescence for internal design problems. Economic obsolescence is external. Physical depreciation reflects age and condition of materials.

Design and utility flaws

A four-bedroom home with one bathroom, a garage too small for modern vehicles, or a commercial building with inadequate ceiling height may suffer functional obsolescence. Appraisers judge whether remodeling can cure the deficiency or whether the flaw is inherent to the structure.

Depreciation in appraisal

In the cost approach, functional obsolescence reduces replacement cost new after physical depreciation. External economic obsolescence comes from neighborhood or market factors outside the building. Sales comparison approach users adjust for functional issues buyers discount in comps.

Examples

  • One-bath colonial

    Buyers discount a otherwise maintained colonial because adding a second bathroom requires major plumbing relocation. The layout flaw is incurable functional obsolescence at reasonable cost.

  • Obsolete HVAC

    A office building lacks central air in a market where tenants expect it. Upgrading is possible, making some functional obsolescence curable through capital investment.

Keep studying

Practice functional obsolescence questionsEnroll in pre-licensing

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