How to Estimate Roof Replacement Cost
A roof replacement typically costs $7,000 to $30,000+ depending on size, materials, and location. Understand the cost breakdown so you can budget accurately and compare bids intelligently.
Quick Cost Range (20-Square Roof)
$6k-$9k
3-Tab Asphalt
$8k-$14k
Architectural
$20k-$36k
Metal Standing Seam
Calculate Your Roof Size
Everything starts with your roof area in squares (100 sq ft each). Use our Roof Area Calculator or follow the manual calculation guide.
Average home: 15-25 squares (1,500-2,500 sq ft of roof area)
Choose Your Material
| Material | Cost/Square (installed) | 20-Square Roof Total |
|---|---|---|
| 3-Tab Asphalt | $300 - $450 | $6,000 - $9,000 |
| Architectural Asphalt | $400 - $700 | $8,000 - $14,000 |
| Metal (Standing Seam) | $1,000 - $1,800 | $20,000 - $36,000 |
| Clay/Concrete Tile | $1,000 - $2,500 | $20,000 - $50,000 |
| Natural Slate | $1,500 - $4,000 | $30,000 - $80,000 |
For regional pricing, see our 2026 Roofing Cost Index.
Add Tear-Off Costs
Removing the old roof adds $100-$175 per square. For a 20-square roof, budget $2,000-$3,500 for tear-off and disposal.
Cost increasers:
- Multiple existing layers (+$50-$100/square per layer)
- Heavy materials (tile, slate, wood shakes)
- Steep pitch (slows work, increases labor)
- Limited dumpster access
Account for Deck Repairs
Once old roofing is removed, damaged sheathing must be replaced. Budget $50-$100 per 4x8 sheet of OSB/plywood plus labor. A typical roof replacement needs 0-10 sheets replaced ($0-$1,500). Severe water damage can push this to $3,000-$5,000.
Add Accessories and Upgrades
| Item | Typical Cost |
|---|---|
| Underlayment (synthetic) | $500 - $1,200 |
| Ice and water shield | $300 - $800 |
| Ridge vent | $300 - $600 |
| Drip edge | $200 - $500 |
| Flashing (valleys, chimney, walls) | $200 - $1,000 |
| Pipe boot replacements | $50 - $100 each |
| Skylight re-flashing | $200 - $600 each |
| Permit | $100 - $500 |
Factor in Labor Variables
- Roof pitch: Steep roofs (over 7/12) add 10-25% to labor costs
- Height: Multi-story homes require more safety equipment and time
- Complexity: Dormers, skylights, valleys, and chimneys slow installation
- Access: Limited truck/dumpster access increases labor costs
- Region: Labor rates vary 30-50% by metro area. Northeast and West Coast are typically highest.
Complete Cost Estimate Worksheet
Example: 20-square architectural shingle replacement
Get a Quick Estimate
Enter your roof size and material for an instant cost range.
Interactive Cost Comparison
Cost per year factors in lifespan. Lower $/year = better long-term value.
Tips for Managing Costs
Get 3-5 bids
Prices vary 20-40% between contractors for the same project.
Off-season scheduling
Late fall and winter often have lower prices due to reduced demand.
Ask about material-only pricing
Some contractors mark up materials 15-25%. Buying materials yourself can save money.
Check for insurance credits
Impact-resistant shingles (Class 4) can earn 5-35% insurance discounts that offset the higher cost.
Learn to read a roofing estimate so you can compare bids accurately.