What Affects the Cost of Roof Replacement?
Roof replacement is a system project, not simply a price per shingle.
By Everyday Home Advice Editorial Team

Roof replacement is a system project, not simply a price per shingle.
Roof size
More roof area generally means more material and labor, but square footage alone doesn't describe the whole job.
Roof complexity
Valleys, dormers, multiple levels, steep slopes, and penetrations all affect installation.
Material
Different roofing systems have different material requirements, installation methods, and accessories.
Tear-off
Clarify what existing material will be removed.
Deck condition
The condition of the roof deck may not be fully visible until the old roofing comes off. Ask how damaged decking is handled and priced.
Flashing and penetrations
Replacement should account for the details around walls, chimneys, vents, and other penetrations.
Ventilation
Ask whether the roof's ventilation will be evaluated as part of the project.
Disposal
Old roofing materials have to be removed and disposed of. Confirm that's included.
Compare scope, not just totals
One proposal may include components another leaves out. Find Local Roofing Help