Which principle suggests that a unique feature might not add proportional value to a property?

The Principle of Contribution asserts that the value of a property is influenced by the specific features or improvements made to it, but not all features contribute to the overall value in a proportional manner. This principle helps determine that while some enhancements can significantly increase a property's worth, others may not add any value or may only marginally improve it.

For instance, if a high-end kitchen renovation is completed in a neighborhood where more moderate upgrades are the norm, the unique feature might not see a return on investment equivalent to the expense incurred. Thus, the distinction lies in the understanding that the contribution of a feature is context-dependent and is measured against the property’s market and location.

Other principles such as the Principle of Consistent Use focus on the idea that a property should be used in a manner that is typical for the area, while the Principle of Competition highlights how numerous similar properties affect value due to market dynamics. The Principle of Change considers the evolution of market forces over time and how they affect property values. Each of these principles plays a role in valuation but does not specifically address how unique features contribute unevenly to a property’s value as the Principle of Contribution does.