# Injurious Affection Assessment

> Use when quantifying injurious-affection damages under OEA s.18(2)(a)/(b) — modeling construction-period noise (dBA), dust (PM2.5/PM10), or vibration (PPV mm/s); valuing permanent proximity impacts via paired sales or hedonic regression; documenting business losses with comparative sales analysis; or calculating cost-to-cure for traffic, signage, or parking impairment.

- Skill: `reggiechan74/injurious-affection-assessment` (Agent Skill, multi-file: 32 files)
- Install (CLI): `npx skillmds@latest add reggiechan74/injurious-affection-assessment`
- Raw SKILL.md: https://api.skillmd.com/api/skills/reggiechan74/injurious-affection-assessment/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: reggiechan74 (https://skillmd.com/u/reggiechan74)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/reggiechan74/injurious-affection-assessment

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**Scope boundary**: This skill covers *external* impacts from the works on remaining property (sensory, proximity, business disruption). For *structural/configurational* loss to the remainder after a partial taking (frontage, shape, access, utilities, farm severance), use `severance-damages-quantification`. Both fall under OEA s.18.

## Construction Period Impacts (Temporary)

Temporary damages during construction period, typically quantified as percentage rent reduction or lump-sum business loss.

### Noise Impact Modeling (dBA Levels, Duration, Receptor Sensitivity)

**Methodology**: Measure noise levels in dBA, assess duration and timing, evaluate receptor sensitivity.

**Sound level measurements**:
- **dBA scale**: A-weighted decibels (approximates human hearing sensitivity)
- **Background noise**: Typical urban 50-60 dBA, suburban 40-50 dBA, rural 30-40 dBA
- **Construction noise**: Typically 70-95 dBA at 15 meters from equipment

**Construction equipment noise levels** (at 15 meters):
- **Impact pile driver**: 95-105 dBA
- **Jackhammer**: 85-95 dBA
- **Heavy trucks**: 80-90 dBA
- **Excavator**: 75-85 dBA
- **Concrete mixer**: 75-85 dBA
- **Generator**: 70-80 dBA

**Distance attenuation**:
- Sound decreases approximately **6 dBA per doubling of distance**
- Example: Pile driver at 95 dBA at 15m → 89 dBA at 30m → 83 dBA at 60m → 77 dBA at 120m

**Impact assessment by receptor**:

**Residential**:
- **Moderate impact**: 65-75 dBA daytime, <60 dBA nighttime (sleep disturbance threshold)
- **Severe impact**: >75 dBA daytime, >60 dBA nighttime
- **Quantification**:
  - Moderate: 5-10% rent reduction during construction
  - Severe: 15-25% rent reduction, potential temporary relocation costs

**Commercial (office)**:
- **Moderate impact**: 70-80 dBA (interferes with phone calls, concentration)
- **Severe impact**: >80 dBA (disrupts normal business operations)
- **Quantification**:
  - Moderate: 3-8% rent reduction
  - Severe: 10-15% rent reduction

**Industrial**:
- **Minimal impact**: <85 dBA (typical industrial background)
- **Quantification**: Generally no compensation unless >85 dBA sustained

**Example calculation**:
- **Property**: 3-storey apartment building, 12 units, $1,800/month/unit rent
- **Construction**: Pile driving 40 meters away for 3 months
- **Noise level**: 95 dBA at 15m → 89 dBA at 30m → 86 dBA at 40m (interpolated)
- **Impact**: Severe (>75 dBA residential)
- **Duration**: 3 months
- **Rent reduction**: 20% × $1,800/unit × 12 units × 3 months = **$12,960**

### Dust and Air Quality (PM2.5/PM10 Levels, Health Impacts)

**Methodology**: Measure particulate matter concentrations, assess health impacts, quantify cleaning costs and health risks.

**Particulate matter standards**:
- **PM10** (particles <10 micrometers): Ontario 24-hour standard 50 μg/m³
- **PM2.5** (particles <2.5 micrometers): Ontario 24-hour standard 27 μg/m³
- **Background levels**: Urban 15-25 μg/m³ (PM2.5), rural 5-10 μg/m³

**Construction dust sources**:
- **Excavation/grading**: PM10 dominant (coarse dust)
- **Concrete cutting/grinding**: PM10 + PM2.5 (respirable dust)
- **Vehicle traffic on unpaved roads**: PM10 (road dust re-suspension)
- **Diesel exhaust**: PM2.5 + ultrafine particles (<0.1 μm)

**Impact zones by distance**:
- **High impact** (0-50m): Visible dust deposition, frequent cleaning required
- **Moderate impact** (50-150m): Occasional dust deposition, periodic cleaning
- **Low impact** (150-300m): Elevated PM levels but minimal deposition

**Quantification approaches**:

1. **Cleaning costs**:
   - **Residential**: $150-$300 per cleaning × frequency (weekly for high impact)
   - **Commercial**: $500-$2,000 per cleaning × frequency
   - **Example**: House 30m from construction, 6-month project, weekly cleaning
     - Cost: $200/cleaning × 26 weeks = **$5,200**

2. **Health impacts (severe cases)**:
   - Respiratory issues requiring medical attention
   - Documented medical costs + loss of enjoyment
   - Example: Elderly resident, pre-existing COPD, 3 hospitalizations attributed to dust
     - Medical costs: $8,000 + suffering: $15,000 = **$23,000**

3. **Rent reduction** (residential/commercial tenants vacate or withhold rent):
   - Moderate dust: 5-10% rent reduction
   - Severe dust: 15-25% rent reduction
   - Example: Office building, severe dust, 4-month impact, $25,000/month rent
     - Compensation: 18% × $25,000 × 4 months = **$18,000**

### Vibration Damage (Structural, Cosmetic, Annoyance Thresholds)

**Methodology**: Measure peak particle velocity (PPV) in mm/s, assess damage risk, document pre-construction condition.

**Vibration thresholds (PPV in mm/s)**:

**Structural damage**:
- **Historic buildings** (unreinforced masonry): 5 mm/s (cosmetic), 12 mm/s (minor structural)
- **Residential buildings** (modern construction): 12 mm/s (cosmetic), 20 mm/s (minor structural), 50 mm/s (major structural)
- **Commercial/industrial**: 20 mm/s (cosmetic), 50 mm/s (structural)

**Cosmetic damage** (cracks in plaster, drywall):
- **Threshold**: 5-12 mm/s depending on building age and condition
- **Repair cost**: $500-$5,000 per location (plaster repair, repainting)

**Annoyance thresholds** (human perception):
- **Barely perceptible**: 0.15-0.3 mm/s
- **Distinctly perceptible**: 0.3-1.0 mm/s
- **Annoying**: 1.0-10 mm/s
- **Very annoying**: >10 mm/s

**Vibration sources and typical PPV** (at 10 meters):
- **Impact pile driver**: 20-80 mm/s (high damage risk)
- **Vibratory pile driver**: 5-20 mm/s (moderate damage risk)
- **Hydraulic hammer**: 5-15 mm/s
- **Compactor/roller**: 2-10 mm/s
- **Loaded truck**: 0.2-0.6 mm/s

**Distance attenuation**:
- PPV decreases with distance approximately: PPV = PPV₀ × (D₀ / D)^1.5
- Example: Impact pile driver 40 mm/s at 10m → 14 mm/s at 25m → 7 mm/s at 50m

**Compensation approaches**:

1. **Pre-construction condition survey**:
   - Document all existing cracks, defects with photos, measurements
   - Post-construction comparison to prove causation

2. **Cosmetic damage repair**:
   - Itemized repair costs (plaster, drywall, paint, flooring)
   - Example: 8 new cracks in century home from pile driving 20m away (PPV 15 mm/s)
     - Repair: 8 locations × $1,200/location = **$9,600**

3. **Structural damage** (rare, typically from non-compliance with vibration limits):
   - Engineering assessment + repair costs
   - Example: Foundation crack in historic building, pile driving exceeded limits
     - Engineering: $8,000, foundation repair: $45,000 = **$53,000**

4. **Annoyance compensation** (no physical damage):
   - Rent reduction for duration of severe vibration
   - Example: Residential, 3 months of daily pile driving (PPV 8 mm/s), very annoying
     - Rent reduction: 10% × $2,500/month × 3 months = **$750**

### Traffic Disruption (Delay Costs, Business Access Impairment)

**Methodology**: Quantify increased travel time, assess business access impacts, calculate economic costs.

**Delay cost calculation**:
- **Value of time**: $25-$50/hour for commercial/industrial users, $15-$25/hour for personal travel
- **Vehicle operating cost**: $0.50-$0.80/km additional distance

**Example (commercial property)**:
- **Before**: Direct access to arterial road, 5-minute travel to customers
- **During construction**: Road closure requires 8 km detour, 20-minute travel
- **Impact**: +15 minutes, +6 km per trip
- **Business trips**: 40 trips/day × 250 days over 6-month construction
- **Annual delay cost**: 10,000 trips × 15 min × (1/60 hr/min) × $40/hr = $100,000
- **Vehicle cost**: 10,000 trips × 6 km × $0.60/km = $36,000
- **Total traffic disruption**: **$136,000**

**Business access impairment**:
- **Lost sales** from customer inability to access business
- **Example**: Retail store, construction blocks parking lot entrance for 4 months
  - Historic sales: $120,000/month
  - Sales during construction: $85,000/month (29% reduction)
  - **Lost revenue**: ($120K - $85K) × 4 months = **$140,000**
  - **Less avoided variable costs** (30%): $140K × 70% = **$98,000 net loss**

**Parking loss**:
- **Residential**: Inconvenience, no compensation unless severe (e.g., disabled resident)
- **Commercial**: Lost customer parking = lost sales
- **Example**: Restaurant loses 15 of 40 parking spaces for 3 months
  - Estimated impact: 20% reduction in dinner sales
  - Dinner sales: $80,000/month × 20% = $16,000/month
  - **Lost profit**: $16,000 × 40% margin × 3 months = **$19,200**

## Permanent Proximity Impacts

Ongoing impacts from completed infrastructure, capitalized to reflect permanent value loss.

### Visual Impact (View Obstruction, Aesthetic Degradation)

**Methodology**: Quantify view loss or aesthetic degradation using market evidence (paired sales, hedonic regression).

**View premium loss**:

**Residential**:
- **Water view**: 15-40% premium (lakefront, ocean view)
- **City skyline view**: 10-25% premium
- **Green space/park view**: 5-15% premium
- **Mountain view**: 10-30% premium

**Example**:
- **Before**: House with unobstructed lake view, value $800,000 (includes 25% view premium)
- **After**: New highway overpass blocks 60% of lake view
- **Adjusted view premium**: 25% × 40% remaining view = 10% premium
- **After value**: $800,000 ÷ 1.25 × 1.10 = $704,000
- **Injurious affection**: $800,000 - $704,000 = **$96,000** (12% loss)

**Aesthetic degradation** (industrial facilities, transmission towers, sound walls):
- Quantified using paired sales of properties with/without visual exposure to infrastructure
- Typical range: 5-15% reduction for significant visual impact

**Paired sales example**:

**Sale 1** (no visual impact):
- House, suburban neighborhood, no infrastructure view
- Sale price: $650,000

**Sale 2** (visual impact):
- Comparable house, same neighborhood, backs onto new transmission corridor with towers
- Sale price: $580,000
- Time/condition adjusted: $590,000

**Visual impact discount**: ($650K - $590K) ÷ $650K = **9.2% reduction**

**Application to subject**:
- Property adjacent to new transmission corridor
- Comparable market evidence: 8-10% reduction
- Property value before: $720,000
- **Injurious affection**: $720,000 × 9% = **$64,800**

### Noise from Operations (HVAC, Traffic, Industrial Processes)

**Methodology**: Measure operational noise increase, compare to background, apply market evidence of noise impact on value.

**Operational noise sources**:
- **Highway traffic**: 65-80 dBA at 30m from highway (depending on volume, speed, trucks)
- **Railway operations**: 70-90 dBA during train passage (at 50m)
- **HVAC equipment**: 55-75 dBA at property line
- **Industrial facilities**: 60-80 dBA at property line (depending on zoning limits)

**Residential noise impact on value**:
- **Moderate increase** (+10 dBA over background): 5-10% value reduction
- **Significant increase** (+15-20 dBA): 10-20% value reduction
- **Severe increase** (+25 dBA or >70 dBA continuous): 20-30% value reduction

**Example**:
- **Before**: Residential property, background noise 45 dBA (quiet suburban)
- **After**: New highway 80m away, noise level increases to 68 dBA
- **Increase**: 68 - 45 = 23 dBA (severe increase)
- **Market evidence**: Comparable sales show 18% reduction for similar highway proximity
- **Property value before**: $550,000
- **Injurious affection**: $550,000 × 18% = **$99,000**

**Commercial/industrial**:
- Generally minimal impact unless noise interferes with business operations
- Example: Recording studio, noise-sensitive use, new rail line increases noise
  - Impact: Business no longer viable at location (requires soundproofing or relocation)
  - **Compensation**: Soundproofing cost $120,000 or relocation cost $200,000 → adopt lower (**$120,000**)

### Safety Perception (Property Value Discounts Near Hazards)

**Methodology**: Market evidence of stigma/safety perception impacts on value near hazardous infrastructure.

**Hazard types and typical market discounts**:
- **High-voltage transmission lines** (230kV+): 5-15% discount (EMF perception, visual impact)
- **Petroleum pipelines**: 5-10% discount (explosion risk perception)
- **Rail corridors** (freight, hazmat): 8-15% discount (derailment risk, noise)
- **Highways**: 5-12% discount (noise, air quality, safety)
- **Cell towers**: 3-8% discount (health perception, visual)

**Example (transmission line)**:
- **Before**: Rural residential property, $420,000
- **After**: New 500kV transmission line 150m from house (within easement corridor on adjacent land)
- **Market evidence**: Sales of homes near transmission lines show 10-12% discount
- **Injurious affection**: $420,000 × 11% = **$46,200**

**Burden of proof**:
- Claimant must provide market evidence (paired sales, expert appraisal)
- Mere fear/perception insufficient without market validation
- Courts generally accept 5-15% range if credible market evidence provided

### Market Evidence (Paired Sales Analysis, Hedonic Regression)

**Paired sales analysis**:
- Identify comparable properties with/without proximity to subject infrastructure
- Adjust for differences in size, age, condition, location
- Extract percentage discount attributable to infrastructure proximity
- Apply to subject property

**Example dataset** (residential near highways):

| Sale | Distance to Highway | Sale Price | Adjusted Price | Discount |
|------|---------------------|------------|----------------|----------|
| 1 | >500m (no impact) | $620,000 | $620,000 | 0% (baseline) |
| 2 | 150m | $565,000 | $580,000 | 6.5% |
| 3 | 80m | $540,000 | $555,000 | 10.5% |
| 4 | 50m | $515,000 | $530,000 | 14.5% |

**Regression equation**: Discount = 0.002 × (500 - Distance)
- At 100m: Discount = 0.002 × 400 = 8%
- At 200m: Discount = 0.002 × 300 = 6%

**Hedonic regression** (multiple variables):
- Model: Price = β₀ + β₁(Size) + β₂(Age) + β₃(Distance to Highway) + β₄(Noise Level) + ε
- Isolates infrastructure impact controlling for other variables
- More robust than paired sales (larger sample, statistical significance testing)

**Example output**:
- β₃ (Distance to Highway) = +$1,200 per meter (price increases $1,200 for each meter farther from highway)
- At 100m distance vs. 500m: Price difference = $1,200 × 400m = $480,000
- Base price $600,000 → **Discount at 100m = 8%**

## Business Losses During Construction

Revenue losses and cost increases during construction period, requiring careful documentation and causation analysis.

### Revenue Loss Documentation (Comparative Sales Analysis)

**Methodology**: Compare actual revenue during construction to baseline revenue (prior years, comparable periods, industry benchmarks).

**Baseline establishment**:
- **Historical comparison**: Same period prior years (adjusted for growth trends)
- **Control location**: Comparable business unaffected by construction
- **Industry benchmarks**: Verify revenue expectations are reasonable

**Example (restaurant)**:
- **Baseline**: Average monthly sales $95,000 (3-year average for construction months, adjusted +3% annual growth)
- **Construction period**: 6 months
- **Actual sales during construction**:
  - Month 1: $88,000 (7% drop)
  - Month 2: $75,000 (21% drop)
  - Month 3: $68,000 (28% drop)
  - Month 4: $72,000 (24% drop)
  - Month 5: $80,000 (16% drop)
  - Month 6: $87,000 (8% drop)
- **Total revenue loss**: [($95K × 6) - ($88K + $75K + $68K + $72K + $80K + $87K)] = $570K - $470K = **$100,000**

**Causation analysis** (critical):
- Correlation with construction activity (worst months = peak construction)
- Control for other factors (weather, competition, economic conditions)
- Comparable business performance (if control location sales stable, strengthens claim)

### Customer Access Impairment (Parking Loss, Signage Obstruction)

**Parking loss quantification**:
- **Retail**: Typically $50-$150 sales per parking space per day
- **Restaurant**: $100-$300 sales per space per day (higher turnover)
- **Office**: Minimal loss (employees use transit or park farther)

**Example (retail)**:
- **Before**: 30 parking spaces, average 3 turns/day, $80 sales/turn = $7,200/day
- **During construction**: 15 spaces lost for 4 months
- **Revenue loss**: 15 spaces × 3 turns × $80 × 120 days = **$432,000**
- **Less avoided variable costs** (40%): $432K × 60% = **$259,200 net loss**

**Signage obstruction**:
- Construction hoarding, equipment blocks business signage from street
- Quantified as percentage revenue reduction from lost visibility
- Example: Restaurant, signage blocked for 5 months
  - Estimated 15% of customers are drive-by traffic attracted by signage
  - Monthly sales: $100,000 × 15% = $15,000/month
  - **Loss**: $15,000 × 5 months × 60% (net of variable costs) = **$45,000**

### Operating Cost Increases (Deliveries, Employee Commute)

**Delivery complications**:
- Increased distance, time for delivery vehicles
- Example: Loading dock blocked, requires 200m detour for all deliveries
  - 10 deliveries/day × 200m × 2 (round trip) × $0.80/km × 0.1 km = $3.20/day
  - 180-day construction period: $3.20 × 180 = **$576** (minimal)

**Employee commute costs** (if employer compensates):
- Parking lot closed, employees must park 500m away
- Employer provides shuttle or parking reimbursement
- Example: 25 employees × $10/day parking × 120 days = **$30,000**

**Increased security** (theft/vandalism risk):
- Example: Retail store, construction creates access vulnerabilities
  - Hires security guard for 4 months: 8 hours/day × $25/hr × 120 days = **$24,000**

### Mitigation Costs (Temporary Relocation, Marketing Campaigns)

**Temporary relocation**:
- Business relocates during construction to avoid severe impacts
- **Costs**: Moving (×2), temporary rent premium, dual occupancy period, customer notification
- Example: Dental office, building uninhabitable during renovation for 6 months
  - Moving costs: $15,000 × 2 = $30,000
  - Temporary space premium: ($8,000 - $5,000) × 6 months = $18,000
  - Dual occupancy (overlap): $8,000 × 1 month = $8,000
  - Patient notification (mail, signage): $3,000
  - **Total relocation cost**: **$59,000**

**Marketing campaigns** (to offset customer loss):
- Additional advertising to inform customers of construction impacts, maintain loyalty
- Example: Restaurant launches social media campaign, special promotions during construction
  - Advertising: $12,000
  - Promotion costs (discounts): $8,000
  - **Total**: **$20,000**
  - **Net benefit**: Revenue loss reduced from $100K to $70K → **campaign saved $30K**, net cost effectively $0 (or claim $70K loss + $20K mitigation costs = $90K)