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Confidence votes 713. It depends on the type of roof. A single story low pitch asphalt shingle roof will cost around $40 - $80 per square (100 sq. ft.) to tear off and $75 - $100 per square to install new shingles. If the plywood sheathing underneath is damaged, it will cost extra, up to $50 per sheet replaced.
Metal roof installation costs around $5 to $15.00 per square foot or more. This works out to a total metal roof price of roughly $7,500 to $22,500 for a 1,500 square foot roof. It's possible in many cases to install a metal roof over old asphalt shingles.