The cost approach values a property by estimating what it would cost to reproduce or replace the improvements as of the effective date, deducting all forms of accrued depreciation, and adding the estimated market value of the land. The approach rests on the principle of substitution: a rational buyer will not pay more for an existing property than the cost of acquiring a comparable site and constructing an equally desirable substitute. The cost approach is most reliable when improvements are new or nearly new — because depreciation is minimal and easily estimated — when the property type is rarely traded in the market so comparable sales are scarce, when the income approach is unavailable because the property does not generate market rent, or when the property has unique characteristics that make sales comparison unreliable.
Reproduction cost is the cost to build an exact replica of the subject improvements using the same materials, design, and construction methods as the original. Replacement cost is the cost to build a building of equivalent utility using current materials, design, and construction standards. For most commercial appraisals, replacement cost is the appropriate basis because it measures the cost of providing the same service capacity rather than literally recreating what exists — a 1960s office building would not be reconstructed using 1960s materials and inefficient floor plates when modern construction achieves the same occupancy and function more efficiently. Replacement cost is estimated using published cost data services (Marshall & Swift, RSMeans) adjusted for location and time, and can be supported by contractor cost estimates or quantity surveys on specialized properties.
Accrued depreciation is the total loss in value from all causes between cost new and the current contribution of the improvements to property value. USPAP and CUSPAP recognize three components. Physical deterioration is wear and tear from use, aging, and deferred maintenance — curable if the cost to repair is less than the value recovered, incurable if the repair cost exceeds the value gain. Functional obsolescence is the loss in value from outdated design, inefficient layout, excess or deficient capacity, or features that are no longer desirable — a low-ceiling industrial building in a market where modern tenants require 32-foot clearances suffers functional obsolescence even if it is physically well-maintained. External obsolescence is the loss in value from factors outside the property itself: neighborhood decline, excess supply in the market, proximity to a negatively-affecting land use, or broad economic shifts affecting demand for the property type.
For appraisers operating under USPAP or CUSPAP, the cost approach is one of three recognized methodologies — alongside the income approach and the sales comparison approach — and all three must be considered and either applied or explicitly excluded with explanation. The cost approach carries disproportionate weight in specific assignment types: new construction, where it provides a value check against replacement cost; special-purpose properties (churches, schools, civic buildings, specialized industrial) where income and sales comparison data is thin; insurance appraisals, where replacement cost is the required basis for coverage limits; and ad valorem property tax assessments where the assessing jurisdiction requires replacement cost analysis. For investment-grade stabilized income properties in active markets, the income approach typically dominates, and the cost approach serves primarily as a corroborating cross-check in the reconciliation.
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