The main roof replacement cost factors
- Roof area: contractors typically estimate material in roofing squares; one square covers 100 square feet.
- Pitch and complexity: steep slopes, valleys, dormers, multiple levels, and limited access increase labor and safety needs.
- Material: asphalt shingles, metal, tile, slate, and low-slope systems differ substantially in material and installation requirements.
- Tear-off and disposal: existing layers and local disposal charges affect price.
- Decking repairs: damaged wood may only become visible after removal.
- Flashing, ventilation, permits, and code: these necessary scope items should not be treated as afterthoughts.
How to build a useful budget
Begin with a professional measurement and inspection. Price-per-square shortcuts can help with early planning, but only a property-specific written scope can account for the actual roof.
What a written estimate should include
- Material manufacturer, product line, and color
- Measured area and layers being removed
- Underlayment, flashing, ventilation, and water protection
- Decking allowance or unit price for concealed repairs
- Permits, cleanup, disposal, and property protection
- Workmanship and manufacturer warranty terms
- Payment schedule, exclusions, and change-order process
How to compare roofing bids
Compare the scope, not just the total. A low bid may omit flashing, ventilation, permits, cleanup, or a realistic decking allowance. Ask each roofer to explain exclusions and who handles warranty callbacks.
Insurance and storm work
A contractor's estimate and an insurance coverage decision are different things. The roofer documents conditions and prices construction; the carrier determines coverage under the policy. Read the roof insurance and inspection FAQ before proceeding.
When to request an inspection
Arrange an inspection when a roof is near the end of its expected service life, leaks recur, materials or flashing are visibly damaged, or severe weather has affected the property.