Cost, depreciation, and replacement

The cost approach estimates what a buyer would pay for the land plus improvements after recognizing their loss in value. It reflects substitution: a buyer considers the cost and practicality of obtaining a site and constructing an equally useful alternative. An existing property may be worth less than new construction cost because it is worn, poorly designed, or adversely affected by its surroundings.

The basic relationship is:

Value = land value + current improvement cost - accrued depreciation

Site improvements can be analyzed separately where appropriate. The key is consistency: do not include a driveway in both the building cost estimate and a separate site-improvement total. The calculation is an indication of value, not a guarantee that the market will repay every expenditure.

The approach is often useful for newer improvements, special-purpose properties, and situations with limited comparable sales or income evidence. It becomes harder when an old or unusual structure requires extensive depreciation estimates. A building can be perfectly maintained yet still suffer functional or external loss, so condition alone does not establish reliability.

Estimate the land as though vacant and available for its highest and best use, subject to relevant restrictions. Comparable land sales are a common source. The building's historical purchase allocation does not automatically establish current land value.

Land is not normally depreciated in the cost-approach calculation. It can still lose market value because of contamination, restrictions, changing demand, or external conditions. "Land is not depreciated" does not mean "land cannot decline in value." An appraiser accounts for the actual property and avoids deducting the same external loss twice.

Site improvements include items such as paving, fencing, landscaping, and utility connections where they are treated separately in the analysis. Unlike the underlying land, they can wear out. Their remaining contribution should reflect condition and market utility, not merely the amount the owner once spent.

Replacement cost estimates an improvement with equivalent utility using current methods and materials. Reproduction cost estimates a duplicate, including original design features. Reproducing an ornate historic building can be more expensive than constructing a modern building serving the same use. An assignment's purpose determines which concept is appropriate.

Historical cost is what was paid at the earlier time. Construction prices, labor, codes, and required materials may have changed. A building that cost $250,000 to construct years ago may have a current replacement cost of $500,000 without having a market value of either amount.

Direct costs include labor and materials attributable to construction. Indirect costs can include design, permits, legal services, financing during construction, and other necessary development expenditures. An allowance for entrepreneurial incentive or profit may also be relevant. Ignoring these costs can understate the economic alternative to buying an existing completed building.

Common estimating methods include a comparative unit method, such as cost per square foot; a unit-in-place method that groups installed components; and a detailed quantity survey. A cost-per-square-foot figure must match the building type, quality, location, and area measurement convention. Multiplying by an arbitrary internet number is not a supported appraisal.

Physical deterioration is loss from wear, damage, and aging. Examples include a leaking roof, damaged siding, or worn flooring. The problem lies in the physical condition of a component. Some deterioration is economically repairable; some is not.

Functional obsolescence is loss from deficient or excessive utility within the property. A poor room arrangement, inadequate electrical capacity for the market's use, or an expensive feature buyers do not value can create this loss. A functional problem may exist in a brand-new building. A house requiring occupants to pass through one bedroom to reach another can be physically sound but functionally awkward.

External obsolescence, also called economic obsolescence, comes from outside the property. Persistent industrial noise, a major employer's departure, or unfavorable market conditions can reduce value. Replacing the property's carpet cannot cure a loss caused by an adjacent nuisance. Such loss is often considered incurable by the individual owner, though it can change if the external condition changes.

The category follows the cause. An old furnace that no longer works has a physical problem. A functioning system that cannot provide the utility buyers expect may have a functional problem. Loss associated with a neighboring source of pollution is external. A fact pattern can contain more than one cause, but the same loss should not be counted repeatedly under different labels.

Curable means economically justified to correct, not merely technically possible. If a repair costs $8,000 and restores $12,000 of value, it is economically supported on those assumptions. If it costs $40,000 and adds only $15,000, it is not economically curable in that analysis.

The decision compares cost with resulting benefit, including relevant circumstances. A code-required repair may be necessary for use or sale even if a simple standalone value increment is hard to isolate. On the exam, use the stated costs and contribution rather than add speculative benefits.

Incurable deterioration can involve short-lived or long-lived components. A building can remain useful after a roof is replaced, while its foundation or structural configuration has a different remaining life. Detailed depreciation methods break these components apart; a simplified question may use one overall percentage.

Chronological age is elapsed time since construction. Effective age reflects condition and utility. A well-renovated 35-year-old building may have an effective age of 15 years, while a neglected younger structure may have an older effective age.

Economic life is the period during which an improvement contributes value. Physical life is how long it can physically remain. A building may still stand after it has ceased to be the economically appropriate improvement for its site. Remaining economic life concerns the future contribution period.

A simplified age-life method estimates depreciation as:

Effective age / total economic life x current cost

Use total economic life in the denominator, not remaining life. A 12-year effective age and 60-year total economic life imply 20% depreciation in this simplified model. The method assumes a relationship that may not capture every physical, functional, or external problem, so it should not be treated as a universal substitute for analysis.

A site is worth $240,000. A 2,000-square-foot building has an estimated replacement cost of $220 per square foot, or $440,000. Its effective age is 10 years and total economic life is 50 years. Applying the stated age-life model gives 20% depreciation, or $88,000. The depreciated building contribution is $352,000.

Separate site improvements contribute $18,000 after their own depreciation. The indicated total is $240,000 + $352,000 + $18,000 = $610,000. Land was not included in the 20% deduction. If a problem instead supplies already-depreciated site and building values, do not depreciate them again.

Appraisal depreciation estimates loss in value. Tax depreciation allocates qualifying basis over tax recovery periods under federal rules. A rental building can appreciate in market value while its owner claims allowed tax depreciation. The deduction does not measure an annual market loss.

Land is not depreciable for federal income tax purposes. Residential rental buildings generally use the applicable 27.5-year recovery period under the general depreciation system; nonresidential real property generally uses 39 years, with exceptions and other systems possible. Those tax periods are not assumed economic lives for every appraisal. Keep the two purposes separate.

Start with current cost, deduct loss attributable to the improvements, and add land. Replacement provides equivalent utility; reproduction duplicates. Physical loss concerns condition, functional loss concerns internal utility, and external loss originates outside the property. Curability is an economic test. Effective age can differ from actual age, and tax depreciation is not a measurement of market decline.