A four-bedroom house has only one bathroom, and buyers discount it heavily for that reason. The loss in value is classified as:

Incurable physical deterioration

A regional landfill opens next to a well-maintained subdivision and values there fall. The resulting loss in value is:

Curable functional obsolescence

An otherwise maintained house has an awkward layout that buyers discount. Which issue is most directly indicated?

External obsolescence from neighboring use

A change in the estate being appraised

Exam vocabulary · form of depreciation

What Is Functional Obsolescence in Real Estate?

Definition

Functional obsolescence is loss in value caused by a defect within the property itself, such as an outdated floor plan, a one-car garage, or a bedroom with no closet. Appraisers split it into curable items worth fixing and incurable ones, then deduct it as depreciation in the cost approach.

How the exam tests functional obsolescence

These mirror the phrasing you will see on test day. Answer them, then read the explanation whether or not you got it right.

Functional Obsolescence: exam questions1/6

Valuation

A home’s outdated floor plan cannot be economically corrected. This is:

score 0/0

Every functional obsolescence question, answered

Every question above with its correct answer and the reasoning behind it. Read the explanations for the ones you answered correctly too. A lucky guess and knowing the rule look identical on a score report. These are sample questions from our larger bank.

1. A home’s outdated floor plan cannot be economically corrected. This is:
- AEconomic appreciation
- BCurable physical deterioration
- CIncurable functional obsolescencecorrect
- DExternal obsolescence
Why: Functional obsolescence is a defect within the property itself; incurable means the cost of fixing it exceeds the value it would add. External obsolescence comes from outside the boundaries.
Valuation
2. A four-bedroom house with a single bathroom suffers from:
- APhysical deterioration
- BFunctional obsolescencecorrect
- CExternal obsolescence
- DProgression
Why: A poor layout or outdated feature within the property is functional obsolescence. Nothing is worn out and nothing outside the boundary caused it.
Valuation
3. A 20-year-old roof has worn out from ordinary weather and use. This loss in value is:
- AExternal obsolescence
- BEconomic appreciation
- CFunctional obsolescence
- DPhysical deteriorationcorrect
Why: Wear from age, use, and weather is "Physical deterioration", the most familiar form of depreciation. Functional obsolescence involves a defect in design or utility rather than simple wearing out of a component.
Valuation
4. A four-bedroom house has only one bathroom, and buyers discount it heavily for that reason. The loss in value is classified as:
- AIncurable physical deterioration
- BPhysical deterioration
- CExternal obsolescence
- DFunctional obsolescencecorrect
Why: A poor design relationship inside the property line is "Functional obsolescence", here a bath count out of step with bedroom count. Nothing is worn out, so classifying it as physical deterioration misreads the cause of the loss.
Valuation
5. A regional landfill opens next to a well-maintained subdivision and values there fall. The resulting loss in value is:
- AExternal obsolescencecorrect
- BFunctional obsolescence
- CPhysical deterioration
- DCurable functional obsolescence
Why: A negative influence originating off the property is "External obsolescence", sometimes called economic obsolescence. Functional obsolescence would require a flaw in the improvement itself, and the homes here are unchanged.
Valuation
6. An otherwise maintained house has an awkward layout that buyers discount. Which issue is most directly indicated?
- AFunctional obsolescencecorrect
- BPhysical deterioration alone
- CExternal obsolescence from neighboring use
- DA change in the estate being appraised
Why: Functional obsolescence concerns utility or design deficiencies. It can exist even where the building is physically well maintained.
Valuation

Where functional obsolescence sits in the exam vocabulary

Functional Obsolescence is a form of depreciation, and so are external obsolescence. That matters more than it sounds: a multiple-choice item builds its wrong answers out of siblings like these, because they are the options that look plausible to someone who has learned the category but not the distinction. If functional obsolescence appears as the correct answer, expect to see external obsolescence on the same screen.

The exam most often tries to catch you by putting functional obsolescence next to external obsolescence. Each of those is a real concept sitting close enough to be tempting, and the question usually turns on the single feature that separates them rather than on the definition of either one. Read the contrast, not the term.

Related exam terms

Tested alongside

external obsolescence

Often confused with

external obsolescence

Functional Obsolescence belongs to the form of depreciation family of exam concepts. When it is solid, take the free real estate exam prep or browse the full real estate exam vocabulary.