Principles of value: highest and best use, substitution, and conformity

Three principles of value

Highest and best use asks which use produces the greatest value after passing four tests. Substitution asks what a buyer would pay for an equally desirable alternative. Conformity asks whether a property's use, size, quality, and design fit its market surroundings. These are market-analysis principles, not guarantees of a particular price.

Highest and best use

A use must be legally permissible, physically possible, financially feasible, and maximally productive. Legal restrictions can exclude a profitable proposal. Lot size, terrain, access, and utilities can exclude a permitted proposal. Financial feasibility asks whether expected benefits justify the costs. Maximum productivity selects the use producing the highest value among the feasible alternatives, rather than the use with the highest gross revenue or largest building.

Analyze land as though vacant separately from property as improved. As though vacant, ask what use of the land meets the four tests. As improved, consider retaining, renovating, converting, or replacing the existing improvements. Demolition and conversion costs matter. A valuable existing building can make continued use appropriate even when vacant land would support a different development.

Substitution

An informed buyer ordinarily will not pay more for a property than the cost of an equally desirable available substitute, assuming no undue delay. Compare equivalent utility, location, condition, and other relevant features. A cheaper property with substantially inferior utility is not an equivalent substitute. This principle supports comparison of competing properties and the appraisal approaches. Seller expenditure alone does not establish market value.

Conformity

Value is generally supported when a property fits the uses and expectations of its neighborhood or market. Compatibility does not require identical buildings and does not concern the personal characteristics of residents. An unusually expensive house among modest houses may be an overimprovement: buyers may not pay back its added construction cost. Regression describes a superior property's value being pulled down by inferior surroundings; progression describes an inferior property's value benefiting from superior surroundings.

For example, a luxury renovation costing $180,000 may add just $70,000 in market value. Its contribution is $70,000, not its cost. Evaluate buyer alternatives and neighborhood expectations together with the four use tests.