| name | easement-valuation-methods |
| description | Use when valuing utility transmission easements, pipeline corridors, rail/transit corridors, access easements, telecom sites, or temporary construction easements. Apply percentage of fee method, income capitalization, before/after paired sales, or rate-of-return for TCEs. Key terms: percentage of fee, income capitalization, paired sales, discount rate, agricultural rent, TCE. |
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.
