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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.
Installation Costs. Stuge says the cost of installation varies not only by the type of material but by the pitch or slant in the roof as well. With asphalt shingles for example, installation costs could range from $25 per square foot for a flat roof up to $50 per square foot for a high pitched roof.ith asphalt shingles for example, installation costs could range from $25 per square foot for a flat roof up to $50 per square foot for a high pitched roof.