How Cost Approach Determines Value in Real Estate Appraisal

In real estate valuation, cost and value are intrinsically linked—but understanding that relationship requires more than simple arithmetic. While construction costs drive the feasibility of new development, the cost approach to value extends far beyond new builds. It becomes an essential valuation tool for unique properties that rarely change hands in the marketplace, where comparable sales data is scarce or non-existent.

Less Common Property

Take, for example, the tunnel car wash. These high-volume conveyor-belt assembly lines are the latest in development of car wash facilities. Let’s say in our market there was one constructed a few years ago, but due to rising construction costs and supply constraints, there are no other similar properties in the area. The competition and property sales are older generation washes with self-wash and automatic bays that handle one car at a time. In this example, the cost approach will provide a reliable value conclusion due to the unique features and limited sales of similar properties. For this property example, responsible appraisal technique would require the full development of the depreciated cost approach.

Application of the Cost Approach

The application of the cost approach requires thorough analysis of the main component: the cost inputs of the land, materials and labor required to construct a replacement of the existing property.

Step 1

The land component is often developed by a sales comparison analysis of similar unimproved properties as of the current date. A value is concluded for the property, as if undeveloped. The next step is the cost inputs of the structural improvements.

Step 2

The cost data for the structural improvements routinely come from three different sources. Those sources are: the owner/builder, in the form of the actual costs, a national cost manual service, and other developer/builders in the area. The analysis should consider locational cost differences and site topography challenges. This analysis is referred to as the construction cost as if built today, or costs new.

Step 3

For properties that are not proposed or recently constructed, the physical depreciation must be considered. Physical depreciation will take into consideration wear and tear items and any major components in need of replacement. Additional adjustments are also necessary for functional and external obsolescence. Functional obsolescence, as stated in the Dictionary of Real Estate Appraisal, seventh edition, is “the impairment of functional capacity of improvements according to market tastes and standards.” In the car wash example, functional obsolescence could be lower ceiling height that does not allow for larger vehicles to enter. Functional obsolescence can be curable or non-curable depending on the cost to cure. The development of functional obsolescence adjustments is developed with actual costs to cure and applied in an appraisal procedural analysis. Similarly, external obsolescence is “a type of depreciation; a diminution in value caused by negative external influences and generally incurable on the part of the owner, landlord, or tenant. The external influence may be either temporary or permanent.” External obsolescence is factors outside of the property that influence the value of the property. This could include noxious odors or excessive noise from adjacent properties.

Final Step

The last step of the cost approach is to put the analysis together. The concluded land value and the depreciated cost of the structural improvements are summed to arrive at the final value by the cost approach. While these steps may appear straightforward, the expertise required to execute them accurately is considerable. Certified general appraisers with advanced designations bring essential market familiarity, cost validation experience, and the ability to identify and quantify subtle functional and external factors that can significantly impact value conclusions for unique or infrequently traded properties.

Valuing unique or special-purpose properties requires precision and deep market knowledge. If you’re dealing with a complex Alaskan property—whether a modern car wash, remote land, commercial facility, or something entirely one-of-a-kind—contact Rikrland Valuation Services today for a consultation with our MAI/ASA-designated experts.