Repair vs Replace Calculator
Decide whether to repair or replace your roof. Uses the 50% rule, roof age, and damage extent to recommend the best option.
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Repair vs Replace Decision
50% Rule: If repair cost > 50% of replacement, replace
Industry guideline
Age: Replace if > 15-20 years (asphalt) or 75% of lifespan
Expected lifespan
Damage: Replace if > 40-50% of roof affected
Extent of damage
The 50% rule: if repair costs exceed half the replacement cost, replacement is usually the better investment. Also consider roof age and whether you plan to stay 10+ years.
Reference: Calculate My Roof, NRCA
Frequently Asked Questions
If the cost to repair your roof exceeds 50% of the cost to replace it, replacement is typically the better investment. You avoid repeated repairs and get a full warranty.
Replace when: (1) roof is 15-20+ years old, (2) damage affects 40-50%+ of roof, (3) repair cost > 50% of replacement, (4) you plan to stay 10+ years.