6.5 Cost Data Sources, Market-Extracted Depreciation, and Cost Approach Reconciliation
Key Takeaways
The 2026 Exam Content Outline names three sources of cost information: cost manuals, actual costs, and market-extracted costs.
Actual construction costs must be checked for what they include, whether they were arm's-length, and their date, because bids can omit soft costs, profit, or unusual items.
Market extraction estimates depreciation from improved sales: sale price minus land value gives the improvements' contribution, and cost new minus that contribution is total depreciation.
Dividing a comparable's depreciation percentage by its age gives an annual rate, and the reciprocal of the annual rate is the implied total economic life.
Reconciliation within the cost approach weighs the reliability of the cost source, the depreciation method, the entrepreneurial incentive, and the land value before concluding one indication.
6.5 Cost Data Sources, Market-Extracted Depreciation, and Cost Approach Reconciliation
Note
When a cost approach is necessary for credible results, USPAP Standards Rule 1-4(b) requires the appraiser to (i) develop an opinion of site value by an appropriate method, (ii) analyze such comparable cost data as are available to estimate the cost new of the improvements, and (iii) analyze such comparable data as are available to estimate depreciation, the difference between cost new and the improvements' present worth. The 2026 Exam Content Outline tests the three sources of cost information, the market extraction method of estimating depreciation, and reconciliation within the cost approach.
1. Three Sources of Cost Information
| Source | What It Is | Strengths | Cautions |
|---|---|---|---|
| Cost manuals and services | Published unit and component costs (for example, the Marshall Valuation Service) by occupancy, construction class, and quality, with current and local multipliers | Consistent, documented, available for any building type | National averages can lag fast-moving material or labor prices; check the manual's notes on what base costs include and exclude, and add items such as entrepreneurial incentive, off-site work, and lease-up costs where they are excluded |
| Actual costs | The subject's or comparables' construction contracts, bids, draw schedules, and schedules of values | Reflects the actual design, site, and local market | Verify scope (hard costs only, or soft costs too), date (time-adjust if needed), arm's-length status, and unusual items such as rush premiums, owner-supplied labor, or change orders; owner-builders' figures often omit profit |
| Market-extracted costs | Costs implied by sales of newly built properties: sale price minus land value | Shows what the market actually pays for new improvements, including the entrepreneurial reward | Needs truly new comparables and reliable land values; small errors in land value become large errors in the extracted cost |
Extracting Entrepreneurial Reward From a New-Construction Sale
A newly completed 60,000 SF warehouse sells for $14,200,000. Comparable land sales support a site value of $2,600,000, and the developer's verified direct and indirect costs were $10,100,000.
- Contribution of the new improvements: $14,200,000 - $2,600,000 = $11,600,000.
- Entrepreneurial reward realized: $11,600,000 - $10,100,000 = $1,500,000.
- As a share of direct and indirect costs: $1,500,000 ÷ $10,100,000 ≈ 14.9%.
Several such sales let the appraiser support the entrepreneurial incentive used in the cost approach instead of relying on a rule of thumb.
2. Market Extraction of Depreciation
Section 6.2 measured depreciation with the age-life and breakdown methods. Market extraction (also called abstraction) measures it from sales of comparable improved properties, so it captures every form of depreciation the market recognized in those sales: physical, functional, and external.
The procedure for each comparable sale:
- Start with the verified sale price (adjusted for financing or conditions of sale if needed).
- Subtract the land value as of the sale date to find the contribution of the improvements.
- Estimate the cost new of those improvements as of the sale date.
- Total depreciation = cost new - contribution of the improvements.
- Depreciation percentage = total depreciation ÷ cost new.
- Annual depreciation rate = depreciation percentage ÷ age (actual age, or effective age if the market evidence supports it).
- Implied total economic life = 1 ÷ annual rate.
Worked Example: Three Industrial Sales
| Item | Sale A | Sale B | Sale C |
|---|---|---|---|
| Sale price | $4,800,000 | $6,300,000 | $3,900,000 |
| Less land value | ($1,200,000) | ($1,500,000) | ($1,000,000) |
| Contribution of improvements | $3,600,000 | $4,800,000 | $2,900,000 |
| Cost new at sale date | $5,000,000 | $6,400,000 | $4,250,000 |
| Total depreciation | $1,400,000 | $1,600,000 | $1,350,000 |
| Depreciation percentage | 28.0% | 25.0% | 31.8% |
| Age (years) | 12 | 10 | 14 |
| Annual rate | 2.33% | 2.50% | 2.27% |
The three sales indicate annual depreciation of about 2.3% to 2.5%. The appraiser concludes 2.35% per year, which implies a total economic life of about 1 ÷ 0.0235 ≈ 43 years.
Applying the rate to the subject: the subject is 11 years old, its improvements have a cost new of $5,600,000, and its land is worth $1,300,000.
- Accrued depreciation: 11 × 2.35% = 25.85%, and $5,600,000 × 0.2585 = $1,447,600.
- Depreciated cost of improvements: $5,600,000 - $1,447,600 = $4,152,400.
- Indicated value by the cost approach: $4,152,400 + $1,300,000 = $5,452,400, rounded to $5,450,000.
Important
Market extraction works only when the comparables suffer the same kinds and degree of depreciation as the subject. If the subject has a functional problem the sales did not have (for example, 18-foot clear height where the comparables have 30 feet), the extracted rate understates its depreciation and a separate deduction is needed. The method also depends on reliable land values: overstating a comparable's land value overstates its depreciation.
3. Reconciliation Within the Cost Approach
Before carrying a cost approach indication into final reconciliation, the appraiser reconciles the competing inputs inside the approach:
- Cost source: Does the manual estimate agree with actual bids or market-extracted costs? If not, why (date, quality class, local conditions)?
- Depreciation method: Do the age-life, breakdown, and market extraction results agree? Market extraction is persuasive when sales are plentiful and similar; the breakdown method is better when the subject has specific curable items.
- Entrepreneurial incentive: Is it supported by new-construction sales or developer surveys for this market and property type?
- Land value: Was it developed as though vacant, at highest and best use, with a method suited to the available data?
Example: For the subject above, a cost manual with the breakdown method indicates $5,520,000, and actual-cost data with market-extracted depreciation indicates $5,450,000. The breakdown estimate depends on several subjective component lives, while the market-extracted rate comes from three similar, recent, verified sales. The appraiser places more weight on the market-extracted indication and concludes $5,475,000 for the cost approach, explaining the reasoning in the report as SR 1-6 and SR 2-2(a)(x) require.
An improved industrial property sold for $3,600,000. The land was worth $900,000 at the time of sale, the cost new of the improvements was $3,375,000, and the building was 10 years old. Using market extraction, what are the annual depreciation rate and the implied total economic life?
1.9% per year; about 53 years
2.5% per year; 40 years
2.0% per year; 50 years
20.0% per year; 10 years
An appraiser obtains the actual construction contract for a recently built office building. Which concern about using these actual costs in the cost approach is most valid?
Actual costs are never acceptable, because USPAP requires published cost manuals
The contract may exclude soft costs, profit, or unusual items, so its scope and terms must be verified
Actual costs already reflect accrued depreciation at the date of the contract, so no depreciation should be deducted
Actual costs must be reduced by the land value before they can be used
A newly completed flex building sold for $9,800,000. The land value is $1,800,000, and the developer's verified direct and indirect costs were $7,000,000. What entrepreneurial reward did the market provide, as a percentage of direct and indirect costs?
12.5% of the improvements' contribution
10.2% of the sale price
18.4% of the sale price
14.3% of direct and indirect costs
Sections you finish are checked off in the contents.