What type of obsolescence is caused by deficiencies or superadequacy within the structure?

Functional obsolescence refers to the loss of value or desirability of a property due to design features that are outdated or unsuitable for current market demands. This can occur when a property has deficiencies—meaning it lacks certain modern features or amenities that buyers expect—or superadequacies—where it includes features that are considered excessive or unnecessary for the market.

An example of functional obsolescence could be a home with only one bathroom, which may not meet the needs of contemporary families, or a property that has highly specialized features not favored by the general market, such as a home with overly extravagant fixtures that make maintenance impractical. By identifying and assessing these deficiencies and superadequacies, appraisers can better understand how they impact a property's overall value.