Which of the following scenarios best exemplifies the Principle of Contribution in real estate valuation?
- AAn appraiser adjusts the price of a comparable home to account for its larger lot size.
- BTwo identical homes in a neighborhood sell for different prices due to varying market conditions.
- CA property's value increases because a new shopping mall is built nearby.
- DA homeowner installs a luxury swimming pool, but it adds less to the property's value than its installation cost.
Show answer & explanationAnswer & explanation
Correct answer: D. A homeowner installs a luxury swimming pool, but it adds less to the property's value than its installation cost.
The Principle of Contribution states that the value of any component of a property is determined by how much value it adds to the overall property, not by its cost. In option A, the luxury pool's cost exceeds its contribution to value, which is a classic illustration of this principle.
Why the other options are wrong
- A. This is an application of the Sales Comparison Approach adjustment, reflecting the Principle of Substitution, not directly the Principle of Contribution of an improvement.
- B. This relates to the Principle of Change and market conditions, not specifically the contribution of an improvement.
- C. This illustrates the Principle of Externalities, where outside factors influence value.
Principle of Contribution
The Principle of Contribution states that the value of any component of a property is determined by how much it adds to the property's overall value, regardless of its actual cost. An improvement's cost does not always equal its contribution to value.
- Value added by an improvement is not necessarily equal to its cost.
- Appraisers analyze if an improvement provides a return in value equal to or greater than its cost.
- Helps determine if an improvement is economically justified.
Memory trick: Cost of the part, for whole it imparts, its value's measured by what it starts.