10.2 The Sales Comparison Approach & Adjustments

10.2 The Sales Comparison Approach & Adjustments

Exam Focus: The Sales Comparison Approach (historically known as the Market Data Approach) is the primary valuation methodology tested on the Texas Broker Exam. You must master the exact criteria for selecting valid comparable properties, the ironclad rule of adjustments (never adjust the subject), the application of the CBS and CIA adjustment rules, the sequence of transactional and physical adjustments, and why mathematical averaging is strictly forbidden during reconciliation.

1. Underlying Principles & Primary Applications

The Sales Comparison Approach is founded upon the Principle of Substitution—which holds that an informed buyer will pay no more for a subject property than the price required to purchase an existing, equally desirable substitute property in the open market.

Primary Applications

• Single-Family Residences & Townhomes: The undisputed gold standard for valuing owner-occupied residential properties where abundant market transaction data exists.
• Residential Condominiums: Highly effective when recent closed sales exist within the same condominium complex or competing buildings.
• Vacant Residential Lots & Acreage Parcels: The preferred method for valuing unimproved land (which is also used in the Cost Approach to determine raw land value).

┌─────────────────────────────────────────────────────────────────────────────┐
│                CRITERIA FOR SELECTING COMPARABLE PROPERTIES                 │
├─────────────────┬───────────────────────────────────────────────────────────┤
│ 1. Arm's-Length │ Open market transaction between unrelated, willing parties│
│    Transaction  │ without duress, undue pressure, or non-market terms.      │
├─────────────────┼───────────────────────────────────────────────────────────┤
│ 2. Geographic   │ Located in the same subdivision, immediate neighborhood,  │
│    Proximity    │ or competing market area (typically within 0.5–1.0 mile). │
├─────────────────┼───────────────────────────────────────────────────────────┤
│ 3. Recency of   │ Closed within the past 3 to 6 months (maximum 12 months in│
│    Sale         │ slow or rural markets with documented market adjustments).│
├─────────────────┼───────────────────────────────────────────────────────────┤
│ 4. Physical &   │ Similar gross living area (GLA), architectural style, age,│
│    Functional   │ condition, lot size, bedroom/bath count, and amenities.   │
└─────────────────┴───────────────────────────────────────────────────────────┘

Minimum Comparable Requirement

Secondary mortgage market guidelines (Fannie Mae, Freddie Mac, FHA, VA) require a minimum of three closed comparable sales that have settled within the past 12 months (preferably within 90 to 180 days). Appraisers may include active listings or pending contracts to illustrate current supply trends, but indicated value must be grounded in verified closed transactions.

2. The Paramount Rule of Valuation Adjustments

When applying the Sales Comparison Approach, no two properties are completely identical. Differences in size, age, condition, location, and amenities must be equalized through financial adjustments.

THE PARAMOUNT RULE OF ADJUSTMENTS: ALWAYS adjust the COMPARABLE property! NEVER adjust the Subject property! The subject property is the fixed baseline benchmark. We modify the comparable's historical sale price to answer the question: 'What would this comparable have sold for if it had the exact same characteristics as the subject property?'

┌─────────────────────────────────────────────────────────────────────────────┐
│                     THE CBS AND CIA ADJUSTMENT MNEMONICS                    │
├─────────────────────────────────────────────────────────────────────────────┤
│  C B S  ───►  COMPARABLE BETTER  ───►  SUBTRACT from Comp Sale Price       │
│  If the Comparable has a superior feature that the Subject lacks,           │
│  we SUBTRACT the contributory market value of that feature from the Comp.   │
├─────────────────────────────────────────────────────────────────────────────┤
│  C I A  ───►  COMPARABLE INFERIOR  ──►  ADD to Comp Sale Price              │
│  If the Comparable is inferior or lacks a feature that the Subject has,     │
│  we ADD the contributory market value of that feature to the Comp.          │
└─────────────────────────────────────────────────────────────────────────────┘

Mathematical Application of CBS and CIA

• Applying CBS (Comparable Better, Subtract):

  • Scenario: The Subject property has a 2-car garage. Comparable #1 sold for $350,000 and features a superior 3-car garage (contributory value: $10,000).
  • Adjustment: Because the comparable is better, we subtract $10,000 from Comp #1's sale price.
  • Adjusted Sale Price: $350,000 - $10,000 = $340,000.

• Applying CIA (Comparable Inferior, Add):

  • Scenario: The Subject property has a luxury inground pool (contributory value: $25,000). Comparable #2 sold for $320,000 and has no pool.
  • Adjustment: Because the comparable is inferior, we add $25,000 to Comp #2's sale price.
  • Adjusted Sale Price: $320,000 + $25,000 = $345,000.

3. Systematic Sequence and Elements of Adjustment

Appraisers apply adjustments in a standardized, sequential order. The first four adjustments are transactional adjustments (frequently applied as percentage adjustments in sequential compounding order), followed by property-specific physical adjustments:

1. Real Property Rights Conveyed: Adjusts for differences in legal estate (e.g., fee simple absolute vs. leasehold estate or life estate).
2. Financing Terms & Concessions: Adjusts for non-standard financing (e.g., creative seller financing with below-market interest rates, or seller-paid closing costs and rate buydowns that inflated the gross sales price).
3. Conditions of Sale: Adjusts for non-arm's-length motivations (e.g., estate liquidations, foreclosure sales, transactions between family members, or corporate relocations).
4. Market Conditions (Time / Appreciation Adjustment): Adjusts for changes in economic conditions, inflation, and market appreciation/depreciation between the historical contract date of the comparable and the effective date of the appraisal.
5. Location: Adjusts for micro-locational differences (e.g., cul-de-sac lot vs. busy four-lane arterial thoroughfare, golf course frontage, greenbelt views, proximity to commercial centers).
6. Physical Characteristics:
   • Gross Living Area (GLA): Finished, above-grade, heated and air-conditioned residential square footage.
   • Site / Lot Size: Differences in usable land area, topography, or frontage.
   • Room Count: Bedroom and bathroom differentials.
   • Age / Condition / Effective Age: Modernization, structural updates, and deferred maintenance.
   • Accessory Amenities: Swimming pools, covered patios, workshops, multi-car garages, fireplaces, and fencing.

4. Net Adjustments vs. Gross Adjustments and Reconciliation

Net vs. Gross Adjustments

Underwriting standards established by mortgage institutions and appraisal organizations evaluate the quality and comparability of selected comps using two mathematical metrics:

• Net Adjustment Percentage: The algebraic sum of positive and negative adjustments divided by the comparable's raw sales price.

  • Formula: Net Adjustment % = (Sum of + and - adjustments / Raw Sales Price) * 100
  • Standard guideline: Net adjustments should generally not exceed 15% of the comparable's sales price.

• Gross Adjustment Percentage: The absolute total sum of all adjustments (treating all positive and negative numbers as positive values) divided by the comparable's raw sales price.

  • Formula: Gross Adjustment % = (Total Absolute Dollar Adjustments / Raw Sales Price) * 100
  • Standard guideline: Gross adjustments should generally not exceed 25% of the comparable's sales price (with single line-item adjustments typically under 10%).

The Final Reconciliation Process

After deriving the adjusted sales price for each comparable property, the appraiser must reconcile these figures into a single indicated market value for the subject property.

CRITICAL EXAM PRINCIPLE — NEVER AVERAGE THE COMPS! An appraiser MUST NEVER calculate a simple mathematical arithmetic average of the adjusted comparable prices (e.g., adding Comp 1, Comp 2, and Comp 3 and dividing by 3). Arithmetic averaging is an abdication of professional appraisal judgment because it assigns equal weight to poor comparables requiring massive adjustments and ideal comparables requiring minimal adjustments.

Proper Weighted Qualitative Reconciliation

The appraiser applies professional judgment by assigning the greatest weight to the comparable property that:

1. Required the lowest gross and net dollar adjustments;
2. Required the fewest individual line-item modifications;
3. Is located in the closest geographic proximity within the same subdivision; and
4. Closed most recently in time relative to the appraisal date.

5. Comprehensive Worked Mathematical Adjustment Grid

To solidify the sales comparison mechanics, examine the complete appraisal adjustment grid below for a Texas residential subject property:

Subject Property Profile:

• Single-family home, 2,400 sq ft Gross Living Area (GLA)
• 3 Bedrooms, 2.5 Bathrooms, 2-Car Garage
• Has an Inground Swimming Pool
• Modern Condition, Standard Subdivision Lot

Market Contributory Values Established by Appraiser:

• GLA: $80 per square foot
• Full Bathroom: $10,000 | Half Bathroom: $5,000
• Inground Swimming Pool: $25,000
• 2-Car vs. 3-Car Garage: $12,000
• Market Appreciation (Time): +0.5% per month (+3% for 6 months ago)

Sales Comparison Adjustment Grid Table

Professional Reconciliation Analysis:

• Comparable #1 ($468,300): Required massive net/gross adjustments (14.2%) across time, GLA, bath count, and pool. Least reliable.
• Comparable #2 ($412,000): Required the lowest gross adjustment percentage (6.4%), closed very recently (1 month ago), and needed adjustments only for GLA and garage.
• Comparable #3 ($420,000): Required low gross adjustments (7.7%), closed 2 months ago, and matches subject GLA perfectly.
• Appraiser's Final Reconciled Value: By placing 60% weight on Comp #2 ($412,000) and 40% weight on Comp #3 ($420,000), the appraiser determines the indicated market value of the subject property is $415,000.