Roof Damage Repair Cost Estimator
Estimate the total cost to repair roof damage based on the affected area, roofing material type, damage severity, and local labor rates.
Formula
Material Cost = Damaged Area (sq ft) × Material Unit Cost ($/sq ft) × Severity Multiplier
Labor Hours = (Damaged Area ÷ 100) × Labor Hours per 100 sq ft × Severity Multiplier × Pitch Multiplier
Labor Cost = Labor Hours × Hourly Rate × (1 + Story Surcharge)
Decking Cost = Damaged Area × $2.00/sq ft (if selected)
Subtotal = Material Cost + Labor Cost + Decking Cost
Total Repair Cost = Subtotal × 1.10 (+10% for waste, underlayment, fasteners, flashing & disposal)
Typical Range = Total ± 20%
Assumptions & References
- Material unit costs are mid-range 2023–2024 averages: Asphalt $1.50/sq ft, Metal $5.00/sq ft, Tile $4.50/sq ft, Wood Shake $3.50/sq ft, Flat/TPO $3.00/sq ft, Slate $15.00/sq ft (HomeAdvisor, Angi, RSMeans).
- Labor hours per 100 sq ft: Asphalt 3.0 hrs, Metal 4.5 hrs, Tile 5.5 hrs, Wood 4.0 hrs, Flat 3.5 hrs, Slate 7.0 hrs.
- Severity multiplier: Minor ×1.00, Moderate ×1.35, Severe ×1.75 — accounts for additional tear-off, material waste, and complexity.
- Story surcharge: 2-story +15%, 3+ story +30% on labor — reflects additional safety equipment and time.
- Pitch multiplier: Low ×1.00, Medium ×1.15, Steep ×1.35 — steeper pitches require more safety measures and slow production.
- Decking replacement (OSB/plywood sheathing) estimated at $2.00/sq ft installed.
- 10% waste & miscellaneous covers underlayment, ice & water shield, roofing nails, flashing, drip edge, and debris disposal.
- Estimates do not include permits, structural repairs, gutters, skylights, or chimney work.
- Actual costs vary significantly by region, contractor, and material availability. Always obtain 3+ contractor quotes.
- Sources: HomeAdvisor (2024), Angi Cost Guides (2024), RSMeans Building Construction Cost Data (2023), NRCA Roofing Manual.