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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.
Cost breakdown. The average prices for this project would include: 1  Hiring a Contractor-according to the ImproveNet.com website, the cost of a standing seem metal roof installation for the house described above would be $6700.2  This includes new plywood sheathing as well as the removal and disposal of pre-existing roofing. This estimate breaks down to $4 per square foot, but it is necessary to note that the the overall average for metal roofing installations will vary according to the region and the materials selected. 2  A homeowner can expect costs to range from as low as $3 per square foot to as high as $15; and.