Roof Damage Repair Cost Calculator
Estimate your roof damage repair cost based on damage type, affected area, roofing material, and local labor rates.
Formula
Material Cost = Affected Area (sq ft) × Material Cost/sq ft × Damage Multiplier
Labor Cost = (Area / 100) × Labor Hours per 100 sq ft × Labor Rate ($/hr) × Pitch Factor × Story Factor × Damage Multiplier
Underlayment/Decking = Area × $2.00/sq ft × Damage Multiplier (if selected)
Waste & Overhead = (Material + Labor + Underlayment) × 10%
Total Cost = Material + Labor + Underlayment + Waste & Overhead + Permit Fee
Typical Range = Total Cost ± 20%
Damage Multipliers: Minor = 15% | Moderate = 40% | Major = 70% | Full Replacement = 100%
Material Costs ($/sq ft installed): Asphalt $3.50 | Wood $5.50 | Metal $8.00 | Tile $10.00 | Slate $16.00 | Flat $5.00
Pitch Factors: Low (flat–3/12) = 1.00 | Standard (4–6/12) = 1.10 | Steep (7–9/12) = 1.25 | Very Steep (10/12+) = 1.45
Story Factors: 1 Story = 1.00 | 2 Stories = 1.15 | 3+ Stories = 1.30
Assumptions & References
- Material costs represent mid-range installed prices per square foot (HomeAdvisor, Angi, RSMeans 2023).
- Labor hours are estimated per 100 sq ft based on material complexity and typical crew productivity.
- Pitch and story factors reflect increased difficulty, safety equipment, and time requirements.
- Damage multipliers estimate the fraction of full replacement cost for each damage severity level.
- Waste & overhead factor of 10% covers material waste, equipment, and contractor overhead.
- Permit cost of $300 is a national average; actual costs range from $150–$500+ depending on jurisdiction.
- Underlayment/decking cost of $2.00/sq ft covers synthetic underlayment (~$0.50/sq ft) and partial OSB decking (~$1.50/sq ft).
- Estimates do not include interior water damage repair, gutters, skylights, or chimney work.
- Costs vary significantly by region, contractor, and material availability. Always obtain 3+ local quotes.
- References: HomeAdvisor Roof Repair Cost Guide (2023), Angi Roof Repair Costs, RSMeans Residential Cost Data.