What is the cost approach in equipment appraisal?
The cost approach estimates value by starting from replacement cost new (RCN), the cost to acquire a current asset of equivalent utility, then deducting depreciation for physical wear, functional obsolescence and economic obsolescence. It is one of three approaches an appraiser reconciles under USPAP, and it carries the most weight for newer, specialized or special-purpose equipment where the resale market is thin. It is not the same as book value, and it is not a substitute for market evidence where a deep secondary market exists.
By Jared Lukes · CEO & lead appraiser · June 1, 2026
The three approaches, in brief
A credible opinion of value weighs three approaches before relying on any one. The cost approach builds value up from what it would take to replace the asset, then deducts for age and condition. The sales comparison approach looks to recent transactions of similar assets. The income approach considers the earnings the asset supports. The appraiser reconciles the three and explains which carried the most weight and why. The cost approach is often the anchor when comparable sales are scarce.
Replacement cost new, not reproduction cost
The cost approach usually starts from replacement cost new: the cost today to obtain a different asset that delivers the same utility, using current materials and technology. That is distinct from reproduction cost, which is the cost to build an exact replica, outdated design and all. For most machinery and equipment, replacement cost is the relevant figure, because a buyer pays for utility, not for a faithful copy of an obsolete machine.
The three kinds of depreciation
Depreciation here is a loss in value from any cause, not the schedule on a tax return. An appraiser accounts for three forms:
- Physical deterioration: wear from use and age, including the condition of high-wear components and remaining useful life.
- Functional obsolescence: a loss from the asset's own design or capacity, such as a machine that is slower, less efficient or more costly to run than current models.
- Economic (external) obsolescence: a loss caused by forces outside the asset, such as a soft market for its output, regulation, or location and utility costs.
Replacement cost new, less all applicable depreciation, points to the asset's contribution to value under the cost approach.
When the cost approach carries the most weight
The cost approach is strongest for newer assets, custom or special-purpose equipment, and installations where few comparable sales exist, such as process lines, integrated systems or heavily configured machines. Where a deep secondary market exists, for example many imaging modalities or common machine tools, the sales comparison approach usually leads and the cost approach supports it. A printout that applies a fixed depreciation curve to a purchase price is not the cost approach. The cost approach requires judgment about each form of depreciation, applied by a certified appraiser after inspection.
Common questions
Answers, up front.
What is replacement cost new (RCN)?
Replacement cost new is the cost today to acquire a different asset that provides the same utility as the subject, using current materials and technology. It is the usual starting point for the cost approach, and it differs from reproduction cost, which is the cost to build an exact replica.
Is the cost approach the same as book value?
No. Book value is an accounting figure based on historical cost and a tax or accounting depreciation schedule. The cost approach is an appraisal method that starts from current replacement cost and deducts for physical, functional and economic depreciation observed in the real asset and its market.
When does an appraiser rely on the cost approach?
Most heavily for newer, specialized or special-purpose equipment where comparable sales are scarce. Where an active secondary market exists, the sales comparison approach usually leads and the cost approach supports the conclusion. The appraiser reconciles all three approaches under USPAP.