Roofing Cost Calculator
Get an instant cost estimate for your roofing project. Our calculator provides estimates adjusted for your state using regional cost indices.
Tip: Your roof area is typically 1.2-1.5x your home's floor area
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How We Calculate Roofing Costs
Our roofing calculator uses per-square (100 sq ft) pricing from contractor bid databases, factoring in material type, roof pitch complexity, tear-off requirements, and regional labor rates from BLS data. We adjust for your state's construction cost index so estimates reflect local market conditions, not just national averages.
We show you a range (low, average, high) because actual costs depend on contractor pricing, material brands, project complexity, and local market conditions. Our data covers all 50 states and is updated quarterly. For the most accurate estimate, we always recommend getting 3+ quotes from licensed local contractors.
Frequently Asked Questions
How accurate is this roofing calculator?
Our estimates are within 15-20% of actual project costs for typical roofing jobs. Material choice and roof complexity (pitch, stories, access) have the biggest impact. Always get 3+ quotes from licensed roofers.
Does this include the cost of removing the old roof?
If you check "Existing roof tear-off needed," yes. Tear-off adds about $1.50 per sq ft ($2,550 for a typical 1,700 sq ft roof). Some areas allow a second layer of shingles over the existing roof, which avoids this cost.
How long does a roof replacement take?
Most residential roof replacements take 2-5 days. Metal and tile roofs take longer (5-10 days). Weather delays are common — schedule for dry periods.
Do I need a permit to replace my roof?
Yes, in most jurisdictions. Roof replacement typically requires a building permit ($150-$500). Your contractor should pull it. Check our permit guide for your state.
Should I repair or replace my roof?
If your roof is under 15 years old and damage is localized, repair is usually better ($300-$1,000). If it is over 20 years, has widespread damage, or you are seeing granules in gutters, replacement is the better investment.