3.3 Sales Comparison Approach & Cost Approach to Valuation

The Sales Comparison Approach (Market Data Approach)

The Sales Comparison Approach (historically termed the Market Data Approach) is the primary and most reliable valuation method for owner-occupied single-family residences, townhomes, residential condominiums, and vacant residential land parcels. It is directly grounded in the Principle of Substitution: an informed buyer will pay no more for a property than the cost of acquiring an equally desirable substitute in the open market.

The Golden Rules of Property Adjustments

When conducting a sales comparison analysis, the subject property serves as the benchmark of fixed physical reality. Because the subject's market value is the unknown figure being solved for, THE SUBJECT PROPERTY IS NEVER ADJUSTED under any circumstances. All adjustments are made directly and exclusively to the known sales prices of the comparable properties.

Real estate examinees must memorize the two foundational adjustment rules:

                  THE GOLDEN RULES OF COMPARABLE ADJUSTMENTS
                                      │
         ┌────────────────────────────┴────────────────────────────┐
         ▼                                                         ▼
   C - B - S                                                 C - I - A
(Comp Better, Subtract)                                   (Comp Inferior, Add)

• If the comparable possesses                             • If the comparable lacks
  a superior feature that the                               a feature that the subject
  subject property lacks...                                 property possesses...
• SUBTRACT the contributory                               • ADD the contributory
  market value of that feature                              market value of that feature
  from the comparable's sale price.                         to the comparable's sale price.

1. C - B - S: Comp Better, Subtract If the comparable sale possesses a superior feature, larger square footage, or premium amenity that the subject property lacks, the comparable must be adjusted downward. The appraiser subtracts the contributory market value of that feature from the comparable's sale price to equalize it with the subject.
2. C - I - A: Comp Inferior, Add If the comparable sale is inferior, smaller, or lacks a desirable amenity that the subject property possesses, the comparable must be adjusted upward. The appraiser adds the contributory market value of that feature to the comparable's sale price to bring it up to the standard of the subject.

Standard Sequence of Adjustments

Under USPAP guidelines, professional adjustments must proceed in a structured, sequential order:

1. Real Property Rights Conveyed: Adjusting for differences in legal estate (e.g., fee simple vs. leasehold or deed-restricted affordable housing).
2. Financing Terms (Cash Equivalency): Adjusting for non-standard financing, below-market seller financing, or substantial seller-paid closing concessions.
3. Conditions of Sale: Adjusting for transactions that were not purely arm's-length (e.g., estate liquidations, short sales, or inter-family transfers).
4. Market Conditions (Date of Sale / Time Adjustment): Adjusting for price appreciation or market softening between the contract date of the comparable and the effective date of the appraisal.
5. Location / Neighborhood: Adjusting for micro-locational differences (e.g., quiet interior cul-de-sac vs. busy commercial thoroughfare, or golf-course frontage vs. proximity to high-tension power lines).
6. Physical Characteristics & Amenities: Adjusting for gross living area (GLA), lot size, bedroom/bathroom counts, basement finish, garage bays, swimming pools, and physical condition.

Paired Sales Analysis

Appraisers determine the precise dollar adjustment for a specific feature using Paired Sales Analysis (matched pairs). By locating two recent comparable sales that are virtually identical in all location, size, and physical characteristics except for one single variable (e.g., one has a two-car attached garage and the other has no garage), the price difference between the two sales isolates the market's contributory value of that single variable.

Reconciliation

Once adjustments are calculated, the appraiser derives an adjusted sales price for each comparable. Under no circumstances should an appraiser or broker compute a simple mathematical average of the adjusted comparables. Doing so violates appraisal standards. Instead, the practitioner performs Reconciliation, weighting the comparables based on reliability, physical proximity, recency of sale, and the magnitude of gross and net adjustments (placing greatest weight on the comp requiring the least overall adjustment).

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The Cost Approach to Valuation

The Cost Approach is grounded in the economic logic that a prudent investor will pay no more for an improved property than the cost to acquire a suitable site and construct an improvement of equivalent utility, without undue delay.

Primary Applicability

The Cost Approach is the most reliable and applicable valuation method for:

• Special-Purpose and Non-Income Producing Properties: Properties with little or no active market sales or rental history, such as schools, public libraries, houses of worship, municipal police stations, and firehouses.
• New Construction: Brand-new homes or commercial buildings where structural depreciation is negligible, and construction costs are fully documented.
• Unique Architectural Properties: Custom architectural compounds where no meaningful comparable sales exist.

The Fundamental Cost Approach Formula

                  THE COST APPROACH FORMULA TO VALUE

         Step 1:  Estimated Reproduction or Replacement Cost New
       - Step 2:  (Accrued Depreciation from All Causes)
       ──────────────────────────────────────────────────────────
                  = Depreciated Value of Improvements
       + Step 3:  Estimated Land / Site Value (as if vacant)
       ──────────────────────────────────────────────────────────
                  = INDICATED VALUE BY THE COST APPROACH

[!CRITICAL] Exam Rule: Land Never Depreciates! In the Cost Approach formula, accrued depreciation applies strictly and solely to the physical improvements (buildings, paving, utilities). Land is NEVER depreciated. The site value is estimated independently—almost universally via the Sales Comparison Approach using comparable vacant land sales—and is added to the depreciated cost of the improvements at the very end of the formula.

Reproduction Cost vs. Replacement Cost

• Reproduction Cost: The dollar expenditure required to construct an exact duplicate replica of the subject building, utilizing identical materials, architectural craftsmanship, layout, construction techniques, and including all obsolete or outdated elements. Commonly employed for historic landmark restorations.
• Replacement Cost: The dollar expenditure required to construct a modern building having equivalent utility and function to the subject property, utilizing contemporary construction standards, modern building materials, and current municipal building codes. Replacement cost eliminates functional obsolescence and is used in standard mortgage appraisal practice.

Methods of Estimating Cost New

1. Square-Foot (Comparative-Unit) Method: The most common and practical method; multiplies the gross square footage of the structure by the prevailing average construction cost per square foot for that building class.
2. Unit-in-Place Method: Computes costs for separate structural components installed in place (e.g., cost per linear foot of concrete foundation, cost per square yard of drywall, cost per square of roofing).
3. Quantity Survey Method: The most exhaustive, precise, and time-consuming method; itemizes every single raw material, nail, labor hour, engineering permit, and contractor markup. Primarily used by professional building contractors and quantity estimators.

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Depreciation Categories & Mechanics

In valuation, Accrued Depreciation is defined as any loss in the market value of an improvement from any cause relative to its cost new. It is fundamentally distinct from accounting depreciation (which is an arbitrary income tax allocation of historic asset cost). Appraisal depreciation is classified into three distinct categories:

                         CATEGORIES OF ACCRUED DEPRECIATION
                                         │
         ┌───────────────────────────────┼───────────────────────────────┐
         ▼                               ▼                               ▼
   PHYSICAL DETERIORATION       FUNCTIONAL OBSOLESCENCE         EXTERNAL OBSOLESCENCE
  • Wear and tear, aging       • Poor design, outdated fixtures • Environmental/locational
  • Curable: Roof, paint       • Curable: Electrical, plumbing  • Always INCURABLE
  • Incurable: Foundation      • Incurable: Flawed floor plan   • Outside property lines

1. Physical Deterioration

Physical wear and tear, structural decay, weather-related aging, and lack of routine maintenance.

• Curable Physical Deterioration: Flaws that are economically feasible to repair. A defect is curable if the cost to cure the defect is less than or equal to the value added to the property upon completion (e.g., repainting a peeling exterior for $4,000 that restores $6,000 in market value; replacing an end-of-life asphalt roof for $12,000).
• Incurable Physical Deterioration: Structural components that are not economically feasible to repair because the cost to cure exceeds any anticipated increase in market value (e.g., an aging load-bearing framing infrastructure or an intact, settling concrete slab foundation with 30 years of remaining physical life where total replacement would require razing the building).

2. Functional Obsolescence

Loss of value resulting from architectural flaws, outdated design characteristics, deficiencies, or superadequacies within the boundaries of the improvements that fail to meet modern market expectations.

• Curable Functional Obsolescence: Design deficiencies that can be rectified economically (e.g., upgrading an obsolete 60-amp electrical service panel to modern 200-amp service; modernizing outdated 1960s laminate kitchen countertops with quartz; converting a walk-in storage pantry into a main-level powder room).
• Incurable Functional Obsolescence: Structural or architectural layout deficiencies that cannot be practically or economically remedied (e.g., a four-bedroom home where access to the fourth bedroom is only possible by walking directly through the primary bedroom; a commercial building with 7-foot ceiling heights where modern warehousing requires 24-foot clearance; excessive structural over-engineering).

3. External (Economic or Locational) Obsolescence

Loss of value caused by adverse economic, environmental, or locational factors situated outside the boundary lines of the subject property.

• ALWAYS INCURABLE!: The property owner has no legal control over external off-site forces. Therefore, external obsolescence is permanently classified as incurable.
• Classic Examples: Construction of a major highway flyover ramp adjacent to a residential backyard; continuous noise pollution from a newly expanded commercial airport flight path; rezoning of adjacent farmland to heavy chemical industrial use; closure of the town's primary manufacturing employer causing widespread regional economic depression; severe localized environmental contamination on an adjoining site.

The Age-Life Method of Accrued Depreciation

The most widespread mathematical formula utilized on real estate licensing examinations to compute accrued depreciation is the Economic Age-Life Method:

$\text{Depreciation Percentage} = \frac{\text{Effective Age}}{\text{Total Economic Life}}$

$\text{Accrued Depreciation (\$)} = \text{Cost New} \times \left( \frac{\text{Effective Age}}{\text{Total Economic Life}} \right)$

• Economic Life: The total period of time over which a structure may reasonably be expected to contribute value or be utilized profitably.
• Effective Age: An appraiser's estimate of a property's age based on its actual physical condition, modernization, and utility, rather than its chronological calendar age. A 50-year-old house that has undergone extensive structural remodeling and mechanical upgrades may possess an effective age of only 15 years.
• Remaining Economic Life: Total Economic Life minus Effective Age.