Roof Replacement Cost Calculator
Include garage and overhangs. Avg US home is ~1,700-2,500 sq ft.
Asphalt 3-Tab Shingles (Basic) – $4.50/sq ft
Architectural Shingles (Standard) – $6.50/sq ft
Metal Roofing (Standing Seam) – $11.00/sq ft
Wood Cedar Shakes – $9.00/sq ft
Clay/Concrete Tiles – $16.00/sq ft
Natural Slate – $25.00/sq ft
Flat / Low Slope (Walkable)
Medium Slope (Standard Residential)
Steep Slope (Difficult/Requires Safety Harness)
Estimated Total Cost Range
$0 – $0
*Includes materials, labor, and 10% waste factor.
Base Material & Install:
$0
Old Roof Removal:
$0
Slope/Difficulty Surcharge:
$0
How to Estimate Your Roofing Costs in 2024
Calculating the cost of a roof replacement involves more than just measuring the square footage of your home. The total price is heavily influenced by the choice of material (asphalt vs. metal vs. tile), the pitch (steepness) of your roof, and local labor rates. This guide helps you understand the metrics used by professional roofing contractors to generate estimates.
Key Factors Affecting Roof Replacement Prices
- Square Footage: Roofers measure in "Squares". One square equals 100 square feet.
- Material Choice: Asphalt shingles are the most affordable, while slate and copper are premium options that can cost 5-10x more.
- Pitch (Slope): Steeper roofs require more safety equipment and slower labor, increasing costs by 15-35%.
- Tear-off: If your existing roof has multiple layers or is damaged, it must be removed. This adds labor and disposal fees.
Average Material Costs per Square Foot (Installed)
The following table represents national averages for materials including basic installation labor:
| Material Type | Lifespan | Avg Cost per Sq Ft |
|---|---|---|
| 3-Tab Asphalt Shingles | 15-20 Years | $3.50 – $5.50 |
| Architectural Shingles | 25-30 Years | $5.50 – $8.00 |
| Metal (Standing Seam) | 40-70 Years | $9.00 – $14.00 |
| Clay/Concrete Tile | 50+ Years | $12.00 – $20.00 |
| Slate | 100+ Years | $20.00 – $40.00 |
How to Measure Your Roof Area
If you don't know your exact roof square footage, you can estimate it based on your home's floor plan footprint. However, you must account for the slope and overhangs.
The Formula: (Home Footprint Area + Overhangs) × Pitch Multiplier = Total Roof Area.
Always add 10-15% for waste (cutting shingles to fit valleys and ridges).
Frequently Asked Questions
Do I need to tear off the old roof?
In many jurisdictions, you are allowed to have up to two layers of shingles. However, tearing off the old roof allows contractors to inspect the decking for rot, which is highly recommended for long-term durability.
Why is the pitch important?
A "walkable" roof (low pitch) is easy to work on. A steep roof (high pitch) requires harnesses, scaffolding, and takes significantly longer to install, driving up labor costs.