Depreciation in property claims: physical, functional, economic

Depreciation is the reduction in an item's value from its cost when new. In property claims, three distinct types are recognized, and only the first is typically calculated line by line on an estimate. Physical depreciation is wear and deterioration caused by age, use, weather exposure, and the passage of time — a 15-year-old asphalt roof has less remaining service life than a new one, independent of anything else about the property.

Functional depreciation (also called functional obsolescence) reflects a loss of usefulness relative to a modern equivalent — a component that still works but is outdated in design, capacity, or efficiency compared to what is currently built. Economic depreciation (external obsolescence) reflects a loss in value caused by factors outside the property itself, such as changes in the surrounding area. Property estimating is concerned almost entirely with physical depreciation; functional and economic depreciation are more commonly discussed in real estate appraisal and rarely appear as a line-item deduction on a property loss estimate.

The standard method for calculating physical depreciation on a property estimate is age divided by expected useful life, expressed as a percentage, then adjusted up or down based on the item's actual documented condition at the time of loss. An item at 8 years of a 20-year expected life is, before any condition adjustment, at 40% depreciation (8 ÷ 20). If the item was well maintained and shows less wear than its age would suggest, the percentage may be adjusted down; if it was neglected or already showing failure, it may be adjusted up.

This calculation is applied on a straight-line basis by default: depreciation accrues at a constant rate over the expected life, rather than front-loaded or back-loaded. Expected useful life figures are typically drawn from published life-expectancy tables for building components (roofing, flooring, appliances, HVAC equipment, and similar categories), and the applicable table entry should be identified on the estimate along with the age and condition basis used for each item.

Depreciation is applied per line item because different components of the same claim age and wear at different rates. A single blanket percentage applied to an entire claim — rather than to each depreciable line individually — does not reflect that a five-year-old water heater and an original 30-year-old foundation are not equally depreciated, and it is difficult for either party to verify a blanket figure against the actual condition of what was damaged.

Life-expectancy tables are a starting point, not a substitute for the inspection. Two roofs of identical age and manufacturer can carry different depreciation percentages if one shows heavier granule loss, more patch repairs, or more direct sun exposure than the other. The table entry establishes the expected life used in the denominator of the calculation; the documented condition is what justifies moving the resulting percentage up or down from the straight age-based figure.

A depreciation percentage is only defensible if the condition finding behind it is documented at the time of the loss inspection, not asserted after the fact. That means photographing the item's actual wear, noting any prior repairs or replacements, recording the manufacture or install date when it is available (a data plate, a permit record, a prior invoice), and stating which life-expectancy table entry and category was used. Where age cannot be established with a record, the estimator should state the basis for the age used (observed condition, comparable properties, or the insured's statement) rather than presenting an unsupported number.

This matters most when a depreciation figure is disputed. A specific, evidence-linked condition record — this shingle shows granule loss consistent with 10-12 years of exposure, this water heater's data plate shows a 2019 manufacture date — is far more defensible than a generic age-based percentage with no supporting observation.

It also matters when two adjusters or an adjuster and a contractor disagree on the number itself. Without a documented condition basis, a dispute over depreciation becomes a dispute over opinion — one party's estimate of wear against another's. With a documented basis, the disagreement narrows to something checkable: whether the photographed condition actually supports the stated adjustment from the base age/life figure, and whether the life-expectancy table entry used was the right one for that specific material and installation.

A physical component wears with age and use; whether the labor required to repair or replace it can be said to "wear" the same way is a genuinely contested question, and jurisdictions do not agree on the answer. California's Fair Claims Settlement Practices Regulations take the position that labor is not a component of physical depreciation at all — with a narrow exception for labor cost embedded in the price of a manufactured material — and therefore may not be depreciated when calculating actual cash value (10 CCR § 2695.9(f)(1)).

Other states have reached different conclusions, in some cases distinguishing between labor to remove damaged material (not depreciable) and labor to install replacement material (depreciable under some policy forms). The Oklahoma Supreme Court addressed exactly this distinction in Branch v. Farmers Insurance Co., holding that the labor cost to remove damaged shingles was not subject to depreciation, while the labor cost to install the new shingles was. Because this varies by state and by the specific policy language, an estimate should keep material and labor costs separable within each line item so the applicable rule can be applied without reconstructing the estimate.

This example illustrates the calculation only; it is not a claim recommendation.

PaxExact's contents valuation, depreciation, and RCV/ACV calculation are designed but not yet in production; today's totals are reported as RCV-only and explicitly marked as not depreciated rather than showing an unsupported ACV figure. Photo and measurement evidence tied to a specific room or item is captured in production today, which is the underlying record a depreciation finding would need to reference.