easement-valuation-methods

Scope

This is the canonical easement-valuation skill in the marketplace. Other skills (notably right-of-way-expert) reference this skill rather than duplicate its methodology. Keep it self-contained and authoritative.

Professional Standards Compliance

Methodology is compliant with USPAP 2024 (USA), CUSPAP 2024 (Canada), Yellow Book / UASFLA (US federal acquisitions), and IVS 2022 (international, IVS 105).

Core principles:

• Before-and-After Method is the preferred approach for partial takings and easements.
• Develop scope of work appropriate to assignment complexity, intended use, and jurisdiction.
• Analyze highest and best use in both Before and After conditions.
• Reconcile approaches through reasoned weighting, never simple averaging.
• Extract easement percentages from paired sales empirically when data allows.

For the full standards treatment, reconciliation framework (Steps 1-5), adjustment hierarchy, and related-skill integration, see compliance-framework.md.

The Five Valuation Methods

#	Method	When to Use	Core Formula
1	Before-and-After	Preferred for partial takings, federal acquisitions (Yellow Book), Ontario expropriations, most USPAP/CUSPAP assignments	Value Before − Value After = Compensation
2	Percentage of Fee	Quick estimate; published ranges available for the corridor type; supplemental support for other methods	Easement Value = Fee Value × Easement % × Affected Area
3	Income Capitalization	Revenue-generating easements (telecom, agricultural rent loss measurable); perpetual duration; reliable cap rate	Easement Value = Annual Income Loss ÷ Cap Rate
4	Before/After Paired Sales (market extraction)	Excellent paired sales available; only difference is the easement; statistical validation possible	Easement % = (Comp w/o Easement − Comp w/ Easement) ÷ Comp w/o Easement
5	Rate-of-Return (TCEs only)	Temporary construction easements when rental market data unavailable	TCE Value = Fee Value × Annual Rate × (Days ÷ 365) + Damage + Business Losses

Method 1 — Before-and-After (Preferred for Partial Takings)

The federal method, preferred under USPAP/CUSPAP for partial takings:

Compensation = Value of entire property BEFORE easement
             − Value of entire property AFTER easement

Equivalent to the Take-Plus-Damages framework (direct land taken + severance damages to remainder), which is sometimes required by client/jurisdiction for itemized reporting. The two frameworks are mathematically equivalent when properly applied. See worked-examples.md §2 for a side-by-side numerical comparison.

For severance damages to the remainder parcel (access loss, shape irregularity, farm operation disruption), use the severance-damages-quantification skill.

Method 2 — Percentage of Fee

Historical market analysis shows a 5-35% range by easement type. Quick reference:

Easement Type	Typical % of Fee
Access easements	5-15%
Utility transmission (legacy ranges)	10-25%
Pipeline corridors (legacy ranges)	15-30%
Modern IRWA-aligned calculator ranges	25-40%+

Full base-percentage tables (by voltage, rail type, pipeline product, and corridor sub-type) plus all domain-specific adjustments live in compensation-tables.md.

Method 3 — Income Capitalization

Convert annual rental income (or productivity loss) to capital value using a cap rate adjusted for easement permanence and risk:

Easement Value = Annual Income Loss ÷ Capitalization Rate

Discount rate selection (full table in compensation-tables.md §5):

• Perpetual government/utility: 4-5%
• Perpetual private party: 5-6%
• Long-term: +1% above perpetual
• Medium-term: +2% above perpetual
• Temporary (1-5 yr): valued as lump-sum, not capitalized

Adjustments: +0.5-1% for uncertain renewal; +1-2% for risky operators; -0.5% for government guarantees; -0.5-1% for indexed escalations.

Agricultural-rent and telecom-site rental tables are in compensation-tables.md §5; worked example for agricultural land is in worked-examples.md §1.

Method 4 — Before/After Paired Sales (Market Extraction)

Ideal paired sales criteria:

• Same market area (within 5-10 km)
• Same highest and best use
• Same size class (±25% land area)
• Similar physical characteristics (topography, soil, access, services)
• Sale timing within 12-18 months
• Only difference: presence/absence of easement

Extraction:

Easement % of total property = (Adjusted no-easement value − Adjusted w-easement value) ÷ no-easement value
Easement % of affected acres   = Total-property % ÷ (Affected acres ÷ Total acres)

For 10+ paired sales, use hedonic regression:

Sale Price = β₀ + β₁(Acres) + β₂(Soil Class) + β₃(Frontage)
           + β₄(Easement Presence) + β₅(Easement Acres) + ε

Implied easement percentage = β₅ ÷ fee-simple per-acre value. Statistical thresholds: R² > 0.70, p < 0.05, VIF < 10.

Full adjustment grid, regression interpretation, and a worked extraction are in worked-examples.md §3.

For rigorous comparable-sales adjustment methodology, use the comparable-sales-adjustment-methodology skill.

Method 5 — Rate-of-Return (TCEs)

Temporary construction easements use rental value for duration plus restoration costs, not capitalized perpetual income.

Preferred — Fair Market Rental: research comparable land rents, apply to affected area, prorate for duration, add damage / restoration / business losses.

Fallback — Rate-of-Return (when rental market data unavailable):

TCE Value = (Affected Fee Simple Value × Annual Rate × Days ÷ 365)
          + Physical Damage Restoration Costs
          + Business / Operational Losses

Annual rates (compensation-tables.md §5):

• 6% — conservative, government agencies (Austin, TX precedent)
• 10% — industry standard for private utility projects (most common)
• 12%+ — high-disruption sites, premium locations, lengthy duration

Duration adjustments: short (<30 days) — daily rate may exceed prorated annual due to fixed setup costs; medium (3-12 months) — standard prorated calculation; long (1-3 years) — may approach permanent easement value; apply 2-4%/yr escalation.

Worked TCE examples (agricultural rental method and industrial rate-of-return method, plus 3-year escalation calculation) are in worked-examples.md §4.

For construction-period noise / dust / vibration / traffic impacts, use the injurious-affection-assessment skill.

Specialized Calculators

Three domain calculators wrap the shared core (easement_calculator_base.py) with corridor-specific base percentages, adjustments, and reconciliation weights.

Calculator	Required Param	Default Reconciliation Weights
hydro_easement_calculator.py (transmission lines)	voltage_kv	50% % of fee / 30% income / 20% before-after
rail_easement_calculator.py (rail / transit)	rail_type (+ optional rail_alignment)	50% % of fee / 20% income / 30% before-after
pipeline_easement_calculator.py (pipelines / subsurface)	pipeline_type	45% % of fee / 30% income / 25% before-after

Full base percentages and adjustment factors per calculator are in compensation-tables.md §§1-3.

Shared core capabilities (easement_calculator_base.py): TCE rate-of-return, income capitalization, before/after comparison, dynamic reconciliation, sensitivity analysis.

Canonical Example — 230 kV Transmission Easement Across Class 1 Farmland

Subject: 15-acre permanent easement on 100-acre Class 1 farm; fee simple value $12,000/acre.

Approach	Calculation	Indicated Value
Percentage of fee	15 ac × $12,000/ac × 15%	$27,000
Income capitalization	15 ac × $60/ac annual loss ÷ 4.5% cap	$20,000
Before/after paired sales	One paired-sale analysis (adjusted)	$24,000

Weighting 40% / 30% / 30% → weighted average $24,000; range $20,000-$27,000; final reconciled value $25,000 after sensitivity testing (cap rate ±1%, percentage ±5%).

Full reasoning, sensitivity check, and a parallel before-and-after vs. take-plus-damages comparison are in worked-examples.md §§2 and 5.

Key Terms

• Before-and-After Method — value of entire property before easement minus value after easement; preferred under USPAP/CUSPAP/Yellow Book for partial takings.
• Take-Plus-Damages Method — direct land taken plus severance damages to remainder; mathematically equivalent to Before-and-After when properly applied.
• Percentage of Fee — easement value expressed as a percentage of underlying fee simple land value.
• Income Capitalization — converts annual income loss to capital value using risk-adjusted cap rate.
• Paired Sales (Market Extraction) — empirical extraction of easement % impact from comparable sales differing only in easement presence.
• Discount Rate / Capitalization Rate — rate used to convert future income streams to present value; varies by easement permanence and operator risk.
• Agricultural Rent — annual rent per acre for comparable farmland; basis for productivity-loss income capitalization.
• TCE (Temporary Construction Easement) — short-duration easement valued by fair-market rental or rate-of-return method, not capitalized perpetual income.
• Rate-of-Return Method — TCE valuation applying annual rate (typically 10%) to affected fee simple value, prorated for duration.
• Severance Damages — damages to the remainder parcel from access loss, shape irregularity, or operational disruption. See severance-damages-quantification.
• Injurious Affection — construction or proximity impacts (noise, dust, vibration, traffic). See injurious-affection-assessment.
• Reconciliation — reasoned weighting of multiple approaches to a single value indication; not a simple average.

Reference Files in This Directory

• compensation-tables.md — base percentages and adjustments for hydro, rail, pipeline calculators; agricultural rent and telecom rental tables; discount and TCE rate tables.
• worked-examples.md — detailed walkthroughs per method (income cap, before-after vs. take-plus-damages, paired sales with adjustment grid and regression, TCE rental and rate-of-return, full reconciliation example, end-to-end transmission workflow).
• compliance-framework.md — USPAP/CUSPAP/Yellow Book/IVS deep dive; reconciliation framework (Steps 1-5); adjustment hierarchy; related-skill integration.
• VERSION.md — version history (do not edit unless updating versioning).
• Calculators: hydro_easement_calculator.py, rail_easement_calculator.py, pipeline_easement_calculator.py, easement_calculator_base.py, plus input schemas and tests.